Thematische Bibliographien / Mineral occurrence

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Auswahl der wissenschaftlichen Literatur zum Thema „Mineral occurrence“

Autor: Grafiati

Veröffentlicht am 18. Mai 2024

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Zeitschriftenartikel zum Thema "Mineral occurrence"

Kang, Zhi Qiang, Zuo Hai Feng, Yong Gao Huang, Hong Yi Chen, Wei Fu und Jia Fei Liao. „Mineralogical Study of Huashan Granite-Type Uranium Ore Deposit in Northeast of Guangxi“. Advanced Materials Research 621 (Dezember 2012): 17–22. http://dx.doi.org/10.4028/www.scientific.net/amr.621.17.

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Huashan granite-type uranium ore deposit is originated within the Huashan granite pluton in northeast of Guangxi, the mineral (mineralization) occurrences already found include Changchong, Baishijiao and Caomiping. Previous studies are relatively weak, especially in mineralogical characteristics, in this paper, a detailed study of minerals has been carried out through EPMA and EDS, the results show that the uranium mineral compositions of the three mineral (mineralization) occurrences are significantly different, but all of them are of secondary uranium minerals, among them, the main component of Changchong mineral (mineralization) occurrence is (meta-) autunite, of Baijiaoshi mineral (mineralization) occurrence is kasolite, and of Caomiping mineral (mineralization) occurrence is torbernite and zeunerite, which reflect the difference of their minerals sources.

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Gavryliv, Liubomyr, Vitalii Ponomar, Marko Bermanec und Marián Putiš. „The Taxonomy of Mineral Occurrence Rarity and Endemicity“. Canadian Mineralogist 60, Nr. 5 (01.09.2022): 731–58. http://dx.doi.org/10.3749/canmin.2200010.

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ABSTRACT Nearly a half of known IMA-approved minerals (as of November 2021) are reported from four localities or fewer and so may be considered rare mineral species. These minerals form a continuum with more common species (e.g., rock-forming minerals), all of which constitute important constituents of Earth and contributors to its dynamics. To better understand the taxonomy of mineral rarity, evaluations have been made on the basis of k-means clustering and kernel density estimation of one-dimensional data on mineral occurrence metrics. Results from second- and third-degree polynomial regression analyses indicate the presence of a divergence between the observed number of endemic minerals discovered since 2000 and those that are likely to represent “true” endemic species. The symmetry index, calculated using the approach of Urusov for each rarity cluster, reveals a gradual decrease from ubiquitous to endemic from 0.64 to 0.47. A network analysis of element co-occurrences within each rarity cluster suggests the existence of at least three different communities having similar geochemical affinities; the latter may reflect the relative abundance of minerals their elements tend to form. The analysis of element co-occurrence matrices within each group indicates that crustal abundance is not the only factor controlling the total number of minerals each element tends to form. Other significant factors include: (1) the geochemical affinity to the principal element in the group (i.e., sulfur for chalcophile and oxygen for lithophile elements) and (2) dispersion of the principal element through geochemical processes. There is a positive correlation between the lithophile element group's abundance in the Earth's crust and the number of common minerals they tend to form, but a negative correlation with the number of rare species.

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Vegarud, Gerd E., T. Langsrud und C. Svenning. „Mineral-binding milk proteins and peptides; occurrence, biochemical and technological characteristics“. British Journal of Nutrition 84, S1 (November 2000): 91–98. http://dx.doi.org/10.1017/s0007114500002300.

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Minerals and trace elements in cow's milk occur as inorganic ions and salts or form complexes with proteins and peptides, carbohydrates, fats and small molecules. The main mineral binder or chelators of calcium are the caseins, αs1-casein, αs2-casein, β-casein and κ-casein, but also whey proteins and lactoferrin bind specific minerals like calcium, magnesium, zinc, iron, sodium and potassium. Less documented is the binding of trace elements. Peptides obtained byin vitroorin vivohydrolysis act as mineral trappers through specific and non-specific binding sites. They may then function as carriers, chelators, of various minerals and thus enhance or inhibit bioavailability. Peptides from milk proteins have found interesting new applications in the food industry as products with improved functionality or as ingredients of dietary products, or used in pharmaceutical industry. Fortification of foods with minerals in a low concentration has for a long time been used in some countries to overcome mineral deficiency, which is an increasing problem in humans. These types of foods are being used to create a new generation of super foods in the industry today.

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Oktyabrsky, R. A., S. A. Shcheka, A. M. Lennikov und T. B. Afanasyeva. „The first occurrence of qandilite in Russia“. Mineralogical Magazine 56, Nr. 384 (September 1992): 385–89. http://dx.doi.org/10.1180/minmag.1992.056.384.11.

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AbstractNumerous small octahedra of a black, brittle, magnetic mineral were found in calciphyre and brucite marble, occurring in the northern part of the exocontact zone of the Kondyor ultramafic-alkalic massif (south-eastern part of the Aldan Shield, 250 km north west of sea port Ayan). Their composition corresponds to the group from titanium magnesioferrite (11.53% TiO2) to titanium-rich magnesian spinel (27.34% TiO2), similar to spinellide found in Greenland (Gittins et al., 1982) and in Iraq (Al-Hermezi, 1985) and approved by the Commission on New Minerals as a new mineral named qandilite. Hardness, specific gravity, and reflectance of Kondyor qandilite are similar to those of the Iraq mineral. Peaks of IR-absorption spectra are equal to 580-590 cm−1 (v2) and 431-438 cm−1 (v2). There is a positive correlation between lattice parameters and the amount of Mg2TiO4: from 8.368 Å at 26.6% to 8.429 Å at 60.4%. Kondyor qandilite crystallized together with geikielite, oxidized alumina spinel (8.55% Fe2O3, ftotal : 16.5%), periclase, and forsterite.

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Zhang, Dongwei, Meng Han, Qianshan Zhou, Tianrui Ye, Yujie Zhou, Ji Chang und Xiaohui Lin. „The Micro-Occurrence Mechanisms of Tight Oil: Fluid–Rock Interactions at Microscale Pores, Nanoscale Pores, and Mineral Surfaces“. Energies 16, Nr. 9 (05.05.2023): 3917. http://dx.doi.org/10.3390/en16093917.

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Understanding the micro-occurrence mechanism of tight oil has long been a daunting challenge in the exploration and development of unconventional resources. This article discusses the micro-occurrence mechanism of tight oil through continuous extraction by combining thin casting, fluorescent thin sections, environmental scanning electron microscope observations, physical property testing, and X-ray diffraction experiments. The results indicated that in the tight sandstone of the Chang 8 Formation in the Ordos Basin, the average tight oil content was 35.46% for microscale pores, 35.74% for nanoscale pores, and 28.79% for mineral surfaces. Six types of micro-occurrence states of tight oil were identified: emulsion, cluster, throat, star-like, isolation, and thin film forms. Although clay minerals and heavy components dominate the adsorption of tight oil on mineral surfaces, micro-occurrence is fundamentally an oil–rock interaction process. Hence, oil–rock interactions and occurrence states were combined in this study to identify tight oil’s micro-occurrence mechanism. The van der Waals forces of attraction between asphaltene molecules and a mineral surface play a critical role, and minerals with hydroxyl groups can also combine with carboxyl and hydroxyl groups present in tight oil. As a consequence of the adsorption of heavy components by minerals, tight oil components remain in microscale and nanoscale pores with a higher saturation, increased aromatic hydrocarbon content, and greater fluidity. The heterogeneity of the components due to adsorption influences the physical properties and mineralization framework of tight oil reservoirs. These findings suggest that tight oil occurrence results from the coupling of microscopic occurrence and component heterogeneity in microscale and nanoscale pores.

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Li, Zhi Wen, Cheng Dong Liu, Xuan Qing Zhao, Jian Hui Lu und Guo Lin Guo. „The Mineral Characteristics and Occurrence of Gold in Nali Gold Deposit, Guangxi“. Advanced Materials Research 936 (Juni 2014): 2383–88. http://dx.doi.org/10.4028/www.scientific.net/amr.936.2383.

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Using the analysis techniques of polarizing optical microscope and electron probe, mineral composition, ore texture and structure and the occurrence of Au in the primary ore are studied. The research shows that the main ore minerals in the ore include realgar, pyrite and arsenopyrite etc. Sulfur-stibarsen is the main carrier of Au, and is the major associated mineral of realgar, surrounded mainly by realgar, and partly is the associated mineral of arsenopyrite. The existence of visible gold and microscopic gold in the ore of this mining area can be excluded, and the gold might exist mainly in the form of inclusion gold, which is the so-called “nanoAu”.

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Mills, Stuart J., und Andrew G. Christy. „Mineral extinction“. Mineralogical Magazine 83, Nr. 5 (20.09.2019): 621–25. http://dx.doi.org/10.1180/mgm.2019.60.

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Abstract‘Mineral evolution’ has attracted much attention in the last decade as a counterpart of the long-established biological concept, but is there a corresponding ‘mineral extinction’? We present new geochronological data from uranium-bearing secondary minerals and show that they are relatively recent, irrespective of the age of their primary uranium sources. The secondary species that make up much of the diversity of minerals appear to be ephemeral, and many may have vanished from the geological record without trace. Nevertheless, an ‘extinct’ mineral species can recur when physiochemical conditions are appropriate. This reversibility of ‘extinction’ highlights the limitations of the ‘evolution’ analogy. Mineral occurrence may be time-dependent but does not show the unique contingency between precursor and successor species that is characteristic of biological evolution.

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DRUMMOND, CARL N. „SOME CHARACTERISTICS AND CAUSES OF CHANGES IN THE RATE OF DISCOVERY OF NEW MINERALS SINCE 1800“. Earth Sciences History 43, Nr. 1 (08.05.2024): 118–39. http://dx.doi.org/10.17704/1944-6187-43.1.118.

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ABSTRACT Construction of a discovery curve for Earth's minerals illustrates an abrupt inflection in rates of discovery and acceptance of new species that occurred in the middle of the 20th century. Prior to that time new mineral discovery is found to have accelerated at a modest pace of 0.3 species / year2. Since 1950 the rate of acceptance has accelerated at an average of 1.04 species / year2 such that the first two decades of the 21st century have been characterized by the acceptance of over 100 new minerals per year. Despite this rapid acceleration of discovery, the relative distribution among the 10 mineral classes of the Nickel-Strunz classification system of minerals identified prior to and after 1950 are nearly identical. Variation in the rates of attestation of the divisions, families, and mineral groups show distinct differences in that the maximum rates of discovery of minerals populating higher taxonomic levels occurred prior to 1950 while the attestation curve of newly recognized groups closely follows that defined by the identification of mineral species. The application of any hierarchical classification system to the mineral species is somewhat arbitrary and subject to biases or inconsistencies associated with the systematics of classification. Therefore, the discovery of new minerals is also considered within the context of the mathematically defined crystallographic space group symmetries. The space group attestation curve has a shape similar to those exhibited by the higher taxonomic levels within the Nickel-Strunz system. However, not all space groups are represented by naturally occurring minerals. Minerals discovered before and after the inflection in rates of new mineral discovery illustrate significantly different patterns of paragenesis. Nearly all of the species have been associated with one or more of 57 distinct paragenetic modes. Minerals that have long been known tend to have a higher number of paragenetic modes than those more recently discovered such that the average number of paragenetic modes is shown to have decreased linearly from 1950 to 2022. Further, the earliest known occurrence of over 80% of the currently accepted mineral species has been tabulated by the International Mineralogical Association. For species discovered prior to the inflection of 1950 a linear distribution of oldest ages is observed indicating that these minerals have earliest ages of occurrence that are uniformly distributed across the interval 0 to 4700 Ma. Conversely, approximately 70% of the species identified since 1950 have oldest known occurrences of less than 600 Ma and the age distribution of these post-1950 minerals exhibit an exponential distribution suggesting increasing efforts in new mineral discovery in tectonically active settings. Despite the differences in the pre- and post-1950 oldest age distributions, both populations exhibit similar temporal excursions in rates of new mineral creation that likely reflect substantial changes in Earth system processes responsible for new mineral formation.

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Birdwell, Justin, Ronald C. Johnson und Michael E. Brownfield. „Distribution of mineral phases in the Eocene Green River Formation, Piceance Basin, Colorado—Implications for the evolution of Lake Uinta“. Mountain Geologist 56, Nr. 2 (01.05.2019): 73–141. http://dx.doi.org/10.31582/rmag.mg.56.2.73.

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The mineralogy of the Eocene Green River Formation in the Piceance Basin, Colorado, has been the subject of numerous studies since the 1920s. Most previous work has focused on the resource potential of these lacustrine mudrocks, which in addition to substantial oil shale potential (in-place resources of 353 billion barrels of synthetic crude oil for rocks yielding at least 25 gallons per ton, GPT), includes nahcolite, a currently utilized soda ash resource, and dawsonite, a potential alternative source of aluminum. Another reason to study the mineralogy in this system is that the geographic and stratigraphic distribution of various authigenic minerals may provide insights into the geochemistry and depositional environment of the long-lived Eocene Lake Uinta. In this study, legacy non-quantitative (presence/absence) X-ray diffraction (XRD) data recently published by the U.S. Geological Survey (USGS) for more than 9,000 samples collected from 30 coreholes in the Green River Formation, Piceance Basin were examined. These data were used to better define the stratigraphic and paleogeographic extent of a set of indicator minerals (illite, analcime, albite, dawsonite, and nahcolite) within the Piceance Basin lacustrine strata. This set of minerals was selected based on observations from previous work and variability in their occurrence and co-occurrence within the Piceance Basin. The USGS database has been used to (1) construct maps showing geographic variations in mineral occurrences for 14 stratigraphically defined rich and lean oil shale zones; (2) assess co-occurrences of indicator minerals; and (3) compare occurrence results with quantitative XRD datasets collected on Piceance Basin oil shales. Occurrences of many authigenic minerals (analcime, dawsonite, and nahcolite) varied in the lacustrine strata near and around the depocenter, but others, like quartz, dolomite, and feldspar (potassium + undifferentiated), were widely and consistently present (>90% of samples) across the basin. Shifts in the distribution of indicator mineral occurrences generally coincide with changes identified in previous lake history descriptions and indicate that the water chemistry of Lake Uinta varied significantly going from near-shore to the depocenter and through time.

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Zhu, Xiaojun, Jingong Cai, Yongshi Wang, Huimin Liu und Shoupeng Zhang. „Evolution of organic-mineral interactions and implications for organic carbon occurrence and transformation in shale“. GSA Bulletin 132, Nr. 3-4 (25.07.2019): 784–92. http://dx.doi.org/10.1130/b35223.1.

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Abstract Organic-mineral interactions are pervasive in sedimentary environments; however, the extent of these interactions is not constant and has a significant impact on organic carbon (OC) occurrence and transformation. To understand the evolution of organic-mineral interactions and the implications for OC occurrence and transformation in fine-grained sediments, several shale samples were selected and subjected to physical and chemical sequential treatments. The samples were subjected to pyrolysis, Fourier transform infrared spectrophotometry (FTIR), and adsorption measurements to determine the organic parameters and the mineral surface area (MSA) of the shale samples. The results show that the organic fractions derived from sequential treatments have varying pyrolysis and FTIR characteristics. The correlation between the total OC content and MSA is positive, but it is split according to organic fractions with different attributes. Correlations between the different organic fractions and MSA indicate that the organic matter in shale is mainly adsorbed on mineral surfaces, while a certain portion of organic matter occurs in the pores and is adsorbed on the organic-mineral aggregates, suggesting variable interactions between the organic fractions with different attributes and minerals. From the pyrolysis and FTIR analysis, the organic fractions of different occurrence sites vary in their OC proportion, proclivity to form organic functional groups, and hydrocarbon generation potential. With increasing burial depth, the MSA and hydrogen index as well as OC loading per unit MSA are reduced, and the OC proportions of organic fractions with different attributes have regular trends. These observations indicate that the extent of organic-mineral interactions that can stabilize organic matter gradually decreases, resulting in transformation of the tightly mineral-combined OC into free OC. Our work reveals the heterogeneity in organic matter occurrence and the effect of the evolution of the organic-mineral interactions on OC occurrence and transformation, which is significant in the global carbon cycle and in petroleum systems.

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Dissertationen zum Thema "Mineral occurrence"

Wilson-Bahun, Tetevi. „An exploration-adjusted mineral occurrence model“. Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/185146.

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A mathematical model describing the probability for n mines or prospects occurring within an elementary unit (cell) of an area has been referred to as an occurrence model. Estimation of parameters of occurrence models has been plagued by the effect of area delineation on the parameters. Moreover, incompleteness of exploration creates a bias in parameter estimates. This study proposes that when the model is to describe the probability for occurrence of mines or prospects, the appropriate area is a metallogenic unit of mining district scale. Accordingly, this study examined the delineation of area by successive expansion of a polygon seeking that size of area which provides the best fitting of a truncated and effort-adjusted exponential model. However, estimation of occurrence model parameters was found to be sensitive to location of polygon on the cluster. Consequently, this approach was abandoned in favour of geologically-defined metallogenic units referred to as Intrinsic Samples. Truncated and effort adjusted occurrence models were fitted to Intrinsic Samples which included the mining districts of the Walker Lake Quadrangle of Nevada and California. The estimated model for each metallogenic unit is used to estimate the gold-silver metal endowment of the unit. This represents a departure from previous studies, e.g. Allais, in which a single parameter estimate from a control area is used to estimate the mineral endowment in all parts of a large study area. Furthermore, the study addresses the issue of economic truncation of occurrence data used in exponential model construction. Because a metallogenic unit is less than completely explored, estimated parameters based on observed occurrences provide a biased description of the number of occurrences present (i.e. endowment). The transition from sample to endowment (population) parameter is achieved by parameterizing the exponential model for a metallogenic unit on exploration effort deployed in a unit area. Thus, fitting the model to observed data and evaluating it at infinite effort yields the model for gold and silver metal endowment in a metallogenic unit.

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Gurung, Anirudra. „Characterization of acidithiobacillus ferrooxidans strains from mineral occurrence sites of Darjeeling Himalaya with special emphasis on genomic locations and activity of insertion sequences“. Thesis, University of North Bengal, 2009. http://hdl.handle.net/123456789/1360.

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Rothe, Matthias [Verfasser], Roland [Gutachter] Psenner, Jörg [Gutachter] Lewandowski, Dagmar [Gutachter] Haase und Gunnar [Gutachter] Nützmann. „Exploring vivianite in freshwater sediments : from the detection of mineral grains towards the understanding of their occurrence / Matthias Rothe. Gutachter: Roland Psenner ; Jörg Lewandowski ; Dagmar Haase ; Gunnar Nützmann“. Berlin : Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://d-nb.info/1109846185/34.

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Conner, Allison B. „The mineral kaersutite and its occurrences /“. Columbus, Ohio : Ohio State University, 2000. http://hdl.handle.net/1811/6354.

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Blieschke, Sarah. „The nature and occurrence of cobalt minerals in the Tennant Creek ores /“. Title page, contents and abstract only, 1996. http://web4.library.adelaide.edu.au/theses/09S.B/09s.bb6478.pdf.

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Thesis (B. Sc.(Hons.))--University of Adelaide, Dept. of Geology and Geophysics, 1997.
Tennant Creek 1:250 000 sheet (SE 53-14) Green Swamp Well 1:250 000 sheet (SE 53-13). Includes bibliographical references (leaves 42-43).

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Peretti, Adolf. „Occurrence and stabilities of opaque minerals in the Malenco serpentinite (Sondrio, Northern Italy) /“. [S.l.] : [s.n.], 1988. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=8740.

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Neto, Antonio Borges de Aguiar. „Heavy minerals occurrences in the continental shelf inner/mean west of CearÃ“. Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13816.

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CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel Superior
This study embraces the west continental shelf of CearÃ (147 samples of marine sediments) and two fluvial courses (4 sediment samples of Curu and SÃo GonÃalo rivers) to determine heavy minerals distribution with their possible provenances and economic potential. Sedimentary facies on the continental shelf were distinguished through the particle size and calcium carbonate content. Heavy minerals were investigated for their total content (%), relative abundance (%) of each mineral species, concentration in Kg/ton of predominant species, mineralogical index (RZi and ZRT) and grains imaging by SEM-EDS. In geoprocessing obtained the spatial distribution of data by Arcgis 10.1 and Surfer 10 got informations about bottom morphology of the continental. Multivariate analysis were included using Statistica 7.0 to aid in the interpretation of results. Heavy minerals were concentrated in Fortaleza chart (contents reached to 4.54%) at depths until 20 m in the litoclastic and litobioclastic sands. Among the 18 mineral species identified, ilmenite and tourmaline were embracing most of the continental shelf and with epidote and monazite presented content > 1 Kg/ton near SÃo GongaÃo do Amarante coast. Paleochannels and ancient beach-ridge were identified. The occurrence of typical regional metamorphic mineral paragenesis of rocks rich in aluminum suggests the provenance of CearÃ Complex rocks (primary source) that occur both near the coast and outcrops directly on the continental shelf. Reworked sediments of Barreiras Formation, beach black sands and longshore drift sediments (secondary sources) contribute regionally in heavy mineral supply.Curu river influences ilmenite, tourmaline and epidote supply. Multivariate analyzes and RZi/ZTR variations corroborated with the dual nature provenance (primary and secondary) of the continental shelf sediments and expose a mixture of recente sediments with older reworked ones.
Este estudo abrange a plataforma continental oeste do CearÃ (147 amostras de sedimentos marinhos) e dois cursos fluviais (4 amostras de sedimentos dos rios Curu e SÃo GonÃalo) para determinar a distribuiÃÃo dos minerais pesados com suas possÃveis proveniÃncias e potencial econÃmico. Distinguiram-se as fÃcies sedimentares da plataforma continental pela granulometria e teor de carbonato de cÃlcio. Os minerais pesados foram investigados pelos seus teores totais (%), abundÃncias relativas (%) de cada espÃcie mineral, teores em Kg/ton das espÃcies predominantes, Ãndices mineralÃgicos (RZi e ZRT) e imageamento dos grÃos por MEV-EDS. No geoprocessamento obteve-se a espacializaÃÃo dos dados pelo Arcgis 10.1 e informaÃÃes da morfologia de fundo da plataforma continental com o Surfer 10. IncluÃram-se anÃlises multivariadas por meio do Statistica 7.0 para auxiliar na interpretaÃÃo dos resultados. Os minerais pesados se concentraram na folha Fortaleza (teores de atÃ 4,54%) em atÃ 20 m de profundidade e nos domÃnios das areias litoclÃsticas e litobioclÃsticas. Dentre as 18 espÃcies minerais identificadas, a ilmenita e a turmalina foram as que abrangeram a maior parte da plataforma continental e juntamente com epÃdoto e monazita apresentaram teores > 1 Kg/ton prÃximo Ã costa de SÃo GonÃalo do Amarante. Foram identificados paleocanais e antigas linhas de praia. A ocorrÃncia da paragÃnese mineral tÃpica de metamorfismo regional de rochas ricas em alumÃnio sugere a proveniÃncia das rochas do Complexo CearÃ (fonte primÃria) que ocorrem tanto prÃximo Ã costa como afloram diretamente na plataforma continental. Sedimentos retrabalhados da FormaÃÃo Barreiras, areias pretas praiais e sedimentos de deriva litorÃnea (fontes secundÃrias) contribuem regionalmente no aporte de minerais pesados. O Rio Curu exerce influÃncia no aporte de ilmenita, turmalina e epÃdoto. As anÃlises multivariadas e as variaÃÃes de RZi e ZTR corroboraram com a proveniÃncia de natureza dual (primÃria e secundÃria) dos sedimentos plataformais, alÃm de expor uma mistura de sedimentos recentes com sedimentos retrabalhados mais antigos.

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Edfelt, Åsa. „Geology, alterations and mineral chemistry of the Tjårrojåkka Fe-oxide Cu-Au occurrences, northern Sweden“. Licentiate thesis, Luleå tekniska universitet, Geovetenskap och miljöteknik, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26616.

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The Tjårrojåkka area is located about 50 km WSW of Kiruna, northern Sweden, and hosts one of the best examples of spatially related Fe-oxide Cu-Au occurrences (the Tjårrojåkka-Fe and Tjårrojåkka-Cu). The bedrock, depositional environment and tectonic evolution of the area were studied through petrological, geochemical and geophysical-petrophysical investigations. The bedrock is dominated by intermediate and basic extrusive and intrusive rocks. The intermediate andesites and basaltic andesites are cut by diabases which acted as feeder dykes for the overlying basalts. The intrusive rocks range from gabbro to quartz-monzodiorite in composition. The area is metamorphosed to epidote-amphibolite facies and has been affected by scapolite, K-feldspar, epidote and albite alteration that is more intense in the vicinity of deformation zones and mineralisations. Based on geochemistry the andesites and basaltic andesites are similar to the Svecofennian Porphyrite Group intermediate volcanic rocks, but have also features common with the intermediate volcaniclastic unit in the underlying Kiruna Greenstone Group. Chemically the basalts and diabases have the same signature, but cannot directly be correlated with any known basaltic unit. Some of the samples have characteristics comparable to the basalts of the Kiruna Greenstone Group. Whether the volcanic sequence at Tjårrojåkka represents the Porphyrite Group or is part of the greenstones could not be unequivocally determined without geochronological data. Three events of deformation have been distinguished in the Tjårrojåkka area; the first one involving NW-SE compression creating NE-SW-striking steep foliation corresponding with the strike of the Tjårrojåkka-Fe and Cu bodies, followed by the creation of an E-W deformation zone. Finally a second compressional event resulted in folding and the formation of a NNW-SSE striking and gently dipping structure possible related to thrusting from SW. The Tjårrojåkka apatite-magnetite ore (52.6 Mt of iron ore @ 51.5% Fe) is a blind ore consisting of a massive magnetite core surrounded by an ore- breccia containing low-grade Cu-mineralisation. Apatite, amphiboles and carbonate occur disseminated and as veins within the massive ore and in the wall rock. The Tjårrojåkka-Cu mineralisation is located 750 m from the Tjårrojåkka-Fe and contains 3.23 Mt ore @ 0.87% Cu. The main ore minerals are chalcopyrite and bornite occurring both disseminated and in veinlets. Minor pyrite, molybdenite and gold have also been observed. The host rock has been affected by strong albite, scapolite, amphibole and K-feldspar alteration. The alteration assemblages at Tjårrojåkka are highly variable with several of the alteration minerals occurring in several generations and settings, and with multiple reactivations of already existing veins and overlapping alteration stages indicating a complex, long history of fluid activity in the area. Similarity in alteration minerals and paragenesis in the iron and copper mineralisation is described in terms of whole rock geochemistry, mineral chemistry and paragenesis. This may partly be explained by the common host rock to the mineralisations, but indicates also similarities in fluid composition. Within the massive magnetite ore apatite, tremolite and carbonate veinlets fill fractures probably formed during cooling of the magnetite body. The wall rock has been affected by extensive pervasive albite and plagioclase alteration. Scapolite occurs locally as porphyroblasts and later veins. The albitised and scapolitised rocks are overprinted by pervasive K-feldspar alteration and veins of K-feldspar + Mg-hornblende ± titanite ± quartz ± magnetite ± sulphides along the foliation. Epidote is common in veins together with K-feldspar. Allanite occurs as an accessory mineral associated with epidote, otherwise REE-minerals are rare. Carbonate and zoelites were the last phases to form in vacancies. The area between the apatite-iron and copper bodies is strongly albite + magnetite altered. The footwall of the copper body is characterised by pervasive albite alteration spatially associated with magnetite and apatite veins cut by later carbonate veinlets. Scapolite (porphyroblasts and veins) is formed in an early stage in the hanging wall overprinted by pervasive K-feldspar alteration. Amphiboles (tschermakites, Mg-hornblende and actinolite) occur in several generations as porphyroblasts, in veins on its own, or together with K-feldspar ± titanite ± quartz ± carbonate ± chalcopyrite ± bornite. Epidote, REE- carbonate, zeolites and fluorite are the latest alteration phases in the copper mineralisation. Ba, Cl, S and F are enriched in the alteration minerals in the Tjårrojåkka occurrences. Barium-rich varieties of K-feldspar (max. 3.5% BaO) occur in the Cu-mineralised breccia surrounding the apatite-magneitie body indicating high concentrations of Ba in the hydrothermal fluids. Absence of sulphate in the fluids probably caused the formation of Ba-feldspars instead of barite. Scapolite shows a trend with more Cl-rich varieties around the magnetite body gradually getting more SO3 and CO2-rich in the Cu-mineralisation. The presence of accessory barite in the copper mineralisation also indicates that the SO3 content in the fluids were higher than in the iron ore. The biotites are rich in Ti while Cl and F contents are more moderate and do not show great variation in different parts of the systems. All amphiboles are Ca-rich ranging from tschermakites, Mg-hornblende to actinolite and tremolite. The apatites are F-dominate with higher Cl content in the apatite- iron ore than in the copper occurrence. Overall the alteration minerals related to the apaite-iron ore are more rich in Cl and Ba than the ones in the Cu-mineralisation that show higher contents of F, SO3 and CO2.
Godkänd; 2003; 20070215 (ysko)

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Machado, Valquíria Silva. „Aspectos bioecológicos de formigas urbanas (Hymenoptera: Formicidae) em um hospital da Zona da Mata Mineira“. Universidade Federal de Juiz de Fora (UFJF), 2009. https://repositorio.ufjf.br/jspui/handle/ufjf/2819.

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As formigas são insetos sociais com características próprias que as propiciam habitarem e se dispersarem à todos ambientes terrestres. Algumas espécies podem causar prejuízos e danos ao homem, e ainda atuarem como vetores patogênicos em hospitais. Este estudo objetivou identificar as espécies de formigas presentes em um hospital da Zona da Mata Mineira, determinar o número médio de formigas visitando a isca por hora (NMFVIH), a similaridade entre os setores, a variação da diversidade nos períodos seco e chuvoso, além de identificar as estruturas físicas utilizadas como recurso para nidificação. Para a coleta da formigas foram utilizadas iscas atrativas não tóxicas, distribuídas a cada dez metros de distância nos seguintes setores: UTI Neonatal (UN), UTI Pediátrica (UP), Enfermaria Feminina (EF) e Entorno Hospitalar (EH). Registraram-se 42 espécies de formigas e quanto à riqueza obteve-se UN (n=4), UP (n=7), EF (n=13) E EH (n=30). Seis espécies foram classificadas como constantes, destacando-se Camponotussp.9, com 100% de ocorrência; 21 acessórias e 15 acidentais; Camponotus sp.4, Hylomyrmasp e Linepithemasp foram encontradas em todos setores. A subfamília Myrmicinae apresentou o maior índice de ocorrência (76,09%) e Ectatomminae com o menor (<0,01%). Os setores internos tenderam à similaridade, com exceção da UN no período seco e o número médio de formigas visitando a isca por hora diferiu significativamente entre as áreas interna e externa. O período de maior ocorrência foi entre às 12:00 e 17:59, período da tarde. Foram quantificados 28 ninhos, Interior Hospitalar (IH=23) e Entorno Hospitalar (EH=5), a categoria fresta foi a estrutura física mais utilizada (n=16) e tubulação (n=1) a menos. A espécie Camponotus sp.9 e Hylomyrmasp.1 nidificaram tanto no EH como no EF. A espécie registrada que mais se distanciou do ninho para forragear foi Attini sp.2 e a que menos se distanciou foi Linepithema sp.1. Conhecer a distribuição física do hospital, das formigas infestantes e a localização dos ninhos pode ser importante para determinar estratégias de controle.
The ants are social bugs with own characteristics that offer them to live and scatter to all terrestrial environments. Some species can cause damage and harm to humans, and still act as pathogenic vectors in hospitals. This study aimed identify the species of ants at a hospital in Zona da Mata Mineira, to determine the average number of ants visiting the bait by hour (NMFVIH), the similarity between the sectors, the variation of diversity in dry and rainy season, besides, identify the physical structures used as a resource for nest building. The ants were collect with non-toxic attractive bait distributed at each ten meters of distance in the following sectors: Neonatal ICU (NI), Pediatric ICU (PI), Women's Infirmary (WI), and the Surrounding area of the Hospital (HS). 42 species of ants were registered and the following diversity of species NI (n=4), PI (n=7), WI (n=13) and HS (n=30). Six species were classified as constant with emphasis for the Camponotussp.9, with 100% of occurrence; twenty-one ancillaries and fifteen accidentals; Camponotus sp.4, Myrmicini sp.1 and Linepithema sp.1 were found in all sectors. The subfamilyMyrmicinae had the highest rate of occurrence (76,098%) andEctatominae with the lowest (<0,01%). The internal sectors tended to similarity, except the NI in the dry season and the average number of ants visiting the bait per hour differed significantly between internal and external areas. The period of higher occurrence of ants used to be between 12:00 PM and 5:59 PM.28 nests were quantified in Area Interior (AI=23) and Area Around (AA=5), the gap category was the most used physical structure (n=16) and tubing (n=1) the lower. The species Camponotus sp.9 and Hylomyrmasp.1 nested both in HI and the HS. The registered species that more distanced itself from the nest to forage was Attini sp.2 and the one that less distanced it was Linepithema sp.1. The results showed that knowing the physical distribution of the hospital, the infesting ants and the location of the nests can be important for control strategies.

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Andrade, Marcelo Barbosa de. „Estudo cristaloquímico de minerais do grupo do pirocloro no Brasil“. Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/44/44135/tde-30072007-165039/.

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Os minerais do grupo do pirocloro (A2B2X6Y1) apresentam grande interesse econômico, principalmente como fonte de nióbio e tântalo, metais que possuem importantes aplicações tecnológicas como a fabricação de aço e a confecção de componentes eletrônicos. Apesar de seu interesse científico e econômico, a maioria das ocorrências brasileiras de minerais do grupo do pirocloro está apenas parcialmente caracterizada ou não dispõe de nenhum estudo mineralógico. Adicionalmente, o atual sistema de classificação dos minerais do grupo do pirocloro, apesar de aprovado pela IMA, não segue as regras gerais de nomenclatura de minerais da própria IMA. Na posição A, não há diferenciação na ocupação por Ca e por Na, e se um ou mais cátions diferentes de Na ou Ca compuserem mais de 20 % total de átomos na posição A, então a espécie é nomeada pelo átomo mais abundante em A (exceto Na e Ca). Por outro lado, a espécie fluornatromicrolita foi aprovada com base na predominância de Na na posição A. Com relação à ocupação da posição B, a divisão entre os grupos não é feita com uma classificação tripartite: as espécies com Nb + Ta >2Ti e Nb > Ta são consideradas como do subgrupo do pirocloro; se Nb + Ta > 2Ti e Ta ≥ Nb, o mineral irá pertencer ao subgrupo da microlita; e se 2Ti ≥ Nb + Ta, o mineral irá pertencer ao subgrupo da betafita. Espécies isoestruturais com outros cátions predominantes na posição B não são incluídas no grupo do pirocloro (por exemplo, romeíta com Sb dominante). Os ânions não são levados em consideração na classificação, mas o flúor foi usado na aprovação da espécie fluornatromicrolita. Neste trabalho, são apresentados novos esquemas de nomenclatura para os minerais do grupo do pirocloro, que levam em consideração os íons ocupantes das posições A, B e Y. Os prefixos são sempre escritos por extenso (\'hidroxi\', \'fluor\', \'calcio\', \'natro\' etc), enquanto os sufixos são representados por símbolos químicos (Na, F, H2O etc) ou por [] (vazio). Os nomes raízes relacionam-se aos cátions predominantes na posição B, levando a termos como pirocloro, microlita, betafita e romeíta. São apresentados novos dados químicos por MEV-EDS e WDS (incluindo análises de Si, normalmente negligenciado na maioria dos dados da literatura). Foram analisados minerais de seis ocorrências em pegmatitos e uma em carbonatito. Os resultados obtidos permitem separar as espécies em três \'famílias\'. A primeira delas poderia ser denominada \'microlita\', envolvendo fluornatromicrolita, fluorcalciomicrolita, oxinatromicrolita e oxicalciomicrolita. Esta família foi identificada nas ocorrências da lavra do Morro Redondo, Coronel Murta, MG; lavra do Jonas, Conselheiro Pena, MG; mina Quixabá, Frei Martinho, PB; Pegmatito Volta Grande, Nazareno, MG; lavra do Ipê, Marilac, MG; e Pegmatito Ponte da Raiz, Santa Maria de Itabira, MG. A primeira das espécies, fluornatromicrolita, parece ser bem mais comum do que se imaginava, tendo sido descrita previamente no Brasil apenas em Quixabá, e agora verificada em diversas das ocorrências estudadas nesta tese. Apesar de usados os prefixos natro e cálcio, todas as amostras parecem tender para um termo de fórmula final (NaCa)Ta2O6F, ou seja, com Na=Ca em apfu, que poderia ser denominado, por exemplo, fluormicrolita-NaCa ou CaNa. O oxigênio é, algumas vezes, superior ao flúor (em apfu) na cavidade Y, dando origem a espécie oxi-. A segunda família poderia ser denominada \'hidromicrolita\', tendendo a [ [](H2O)]Ta2O6(H2O). Esta fórmula, entretanto, não é eletricamente neutra, necessitando que na cavidade A, (H2O) seja parcialmente substituído por cátions (Ba, U etc), ao mesmo tempo que parte do O da posição X seja substituído por (OH). Minerais desta família foram verificados no Pegmatito Volta Grande, Nazareno, MG. A terceira família, do \'pirocloro\', verificada apenas no carbonatito da mina Jacupiranga, Cajati, SP, inclui as espécies fluorcalciopirocloro e oxicalciopirocloro. Os novos nomes sugeridos parecem discriminar melhor as espécies, com base em cátions, vazios ou H2O predominantes nas posições A, B eY, permitindo inclusive uni-las em \'famílias\'. Esta nova nomenclatura apresenta também como vantagem não dar ênfase a componentes menores da cavidade A, bem como verificar nela a predominância de Ca ou Na. Adicionalmente, os cátions Ta, Nb e Ti passam a ter a mesma importância na cavidade B. Por outro lado são criados nomes \'exóticos\', como hidrohidromicrolita, ou \'impronunciáveis\', como hidro-[]-microlita.
Pyrochlore group minerals are important sources of niobium and tantalum and these metals are used in important technological applications such as steel manufacturing and eletronic components development. However, the majority of Brazilian occurrences are only partially characterized or there is no mineralogic study available. In addition, the official pyrochlore-group minerals classification system does not follow the IMA mineralogical nomenclature rules although this system is approved by IMA. In the A site, it does not differentiate between occupation by Ca and Na, and if there is one or more cation other than Na or Ca composing more than 20% of total A-atoms, then the species must be named according to the most abundant A-atom, other than Na or Ca. In spite of this, the species fluornatromicrolite was approved based on the predominance of Na in the A-site. Regarding the B-site occupation, the division among the subgroups is not made with a tripartite symmetrical classification: the species with Nb + Ta >2Ti and Nb > Ta are considered as pyrochlore subgroup minerals; if Nb + Ta > 2Ti and Ta ≥ Nb, the mineral will belong to the microlite subgroup; and if 2Ti ≥ Nb + Ta, the mineral will belong to the betafite subgroup. Isostructural species with other predominant cations in the B-site are not included in the pyrochlore-group (for example, romeite, with dominant Sb). The anions are not taken into account in the classification but the predominance of fluorine was used for the approval of the species fluornatromicrolite. In this present work new nomenclature schemes, based on the ions in A, B and Y sites, are presented. Prefixes are, for example, \'hidroxi\', \'fluor\', \'calcio\', \'natro\' etc., while sufixes are represented by chemical symbols (Na, F, H2O etc) or [] (vacancies). The root names (pyrochlore, microlite, betafite, romeite) are related to the dominant-constituent cations in the B position. New chemical data by MEV-EDS and WDS (including Si analysis, hardly ever mentioned in litetarature) were obtained. Six occurrences from pegmatites and one from carbonatite were analysed. The results allow the species to be grouped in three \'families\'. The first could be named as \'microlite\', and includies fluornatromicrolite, fluorcalciomicrolite, oxinatromicrolite and oxicalciomicrolite. This family was identified in Morro Redondo quarry, Coronel Murta, MG; Jonas quarry, Conselheiro Pena, MG; Quixabá mine, Frei Martinho, PB; Volta Grande pegmatite, Nazareno, MG; Ipê quarry, Marilac, MG and Ponte da Raiz pegmatite, Santa Maria de Itabira, MG. Fluornatromicrolite seems to be more common than was previously thought. It was previously described only in Quixabá but now many other occurrences are known. Although \'natro\' and \'calcio\' prefixes were used, all the formulae seem to approach the term (NaCa)Ta2O6F. As Na approximately equals Ca (apfu) it could be used the name fluornatromicrolite-Na-Ca or CaNa could be used. The oxigen content is sometimes greater than F content in the Y position. This generates the oxi- species. The second family could be named \'hidromicrolite\', becoming [ [] (H2O)]Ta2O6(H2O). This formulae is not eletrically neutral so the H2O is replaced by cations (Ba, U etc) in the A cavity while the O is replaced by (OH) in the X position. Minerals from this family were identified in the Volta Grande pegmatite, Nazareno, MG. The third family, \'pyrochlore\', was only verified in the Jacupiranga mine, Cajati, SP, including fluorcalciopyrochlore and oxicalciopyrochlore species. The suggested new names, based on cations, vacancies or H2O dominant constituents of A, B and Y sites, seem to better describe the species, allowing their grouping in families. This new nomenclature has the advantage of not emphasize minor constituents in the A cavity, and verify the dominance of Ca or Na. Furthermore, Ta, Nb and Ti cations have the same balance in B cavity. On the other hand, exotic names were created such as hydrohydromicrolite or unpronounceable as hydro-[]-microlite.

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Survey, Northern Territory Geological, Hrsg. MODAT: Mineral occurrence database. [Darwin, N.T.]: Northern Territory Geological Survey, 2003.

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Brookins, Douglas G. Mineral and energy resources: Occurrence, exploitation, and environmental impact. Columbus: Merrill Pub. Co., 1990.

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Survey, United States Geological. Conterminous United States Mineral Assessment Program: Background Information to Accompany Folio of Geologic, Geophysical, Geochemical, Mineral-Occurrence, Mineral Resources Potential and Mineral: Production. S.l: s.n, 1986.

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Kurtak, Joseph M. 2017 mineral occurrence and development potential report: Locatable and salable minerals, Bering Sea-Western Interior resource management plan. 2. Aufl. Anchorage, Alaska: [U.S. Department of the Interior, Bureau of Land Management, Alaska State Office], 2017.

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Geological Survey (U.S.), Hrsg. MRDS-DTR: A mineral occurrence database for VAX DATATRIEVE based on the USGS Mineral Resource Data System. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1987.

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Davis, Louderback George. Benitoite, a new California gem mineral and Benitoite, its parageneses and mode of occurrence. Redondo Beach, Calif: The Gemmary, 1985.

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Allen, B. L., und B. F. Hajek. „Mineral Occurrence in Soil Environments“. In SSSA Book Series, 199–278. Madison, WI, USA: Soil Science Society of America, 2018. http://dx.doi.org/10.2136/sssabookser1.2ed.c5.

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Shugg, Andrew. „Occurrence of High Bicarbonate Groundwater in Victoria, Australia“. In Thermal and Mineral Waters, 97–110. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-28824-1_9.

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Knolle, Friedhart, Ewald Schnug, Manfred Birke, Rula Hassoun und Frank Jacobs. „Uranium in German Mineral Water – Occurrence and Origins“. In The New Uranium Mining Boom, 749–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22122-4_85.

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Cady, John G. „Mineral Occurrence in Relation to Soil Profile Differentiation“. In Selected Papers in Soil Formation and Classification, 336–41. Madison, Wisconsin, USA: Soil Science Society of America, Inc., 2015. http://dx.doi.org/10.2136/sssaspecpub1.c27.

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Zhang, M. J., P. Q. Hu, P. Zheng, X. B. Wang und L. W. Li. „Modes of occurrence of H2 in mantle-derived rocks“. In Mineral Deposit Research: Meeting the Global Challenge, 73–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/3-540-27946-6_19.

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Paar, W. H., H. Putz, D. Topa, M. K. de Brodtkorb und R. J. Sureda. „Occurrence and paragenesis of tellurium in mineral deposits of Argentina“. In Mineral Deposit Research: Meeting the Global Challenge, 1419–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/3-540-27946-6_361.

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Fernandez-Martinez, Alejandro, Hugo Lopez-Martinez und Dongbo Wang. „Structural Characteristics and the Occurrence of Polyamorphism in Amorphous Calcium Carbonate“. In New Perspectives on Mineral Nucleation and Growth, 77–92. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45669-0_4.

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Gerel, O., D. Sharhuuhen und G. Badarch. „PGE-Au Occurrence at Altan Uul-Tamgat in South Gobi, Mongolia“. In Mineral Deposits at the Beginning of the 21st Century, 1105–8. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003077503-284.

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Abimbola, Akinlolu F., Akinade S. Olatunji, Samuel O. Akande und Adenike M. Borode. „Phosphorite and gypsum occurrence in the Upper Cretaceous Dahomey Basin, SW Nigeria: Chemistry, mineralogy and origin“. In Mineral Deposit Research: Meeting the Global Challenge, 875–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/3-540-27946-6_222.

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Agterberg, Frederik P. „Estimating the Probability of Occurrence of Mineral Deposits from Multiple Map Patterns“. In Use of Microcomputers in Geology, 73–92. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4899-2335-6_4.

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Konferenzberichte zum Thema "Mineral occurrence"

Iblaminov, R. G. „LITHOGENIC MINERAL DEPOSITS“. In Проблемы минералогии, петрографии и металлогении. Научные чтения памяти П. Н. Чирвинского. Perm State University, 2023. http://dx.doi.org/10.17072/chirvinsky.2023.94.

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The concept of lithogenic deposits as exogenous products of geological processes suitable for use with real or expected benefits is considered. They differ in the specifics of genesis, conditions of occurrence and mineral composition. The occurrence of deposits in the upper part of the sedimentary shell makes them available for development. These include common minerals. In the future, the use of lithogenic deposits will expand due to their use in construction, agriculture and other industries.

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Hlava, Paul F., und Douglas F. Irving. „An occurrence for betekhtinite in New Mexico“. In 6th Annual New Mexico Mineral Symposium. Socorro, NM: New Mexico Bureau of Geology and Mineral Resources, 1985. http://dx.doi.org/10.58799/nmms-1985.64.

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Graeme IV, Richard W., und Douglas L. Graeme. „Calcites from Bisbee, Arizona: Notes on a New Occurrence“. In 6th Annual New Mexico Mineral Symposium. Socorro, NM: New Mexico Bureau of Geology and Mineral Resources, 1985. http://dx.doi.org/10.58799/nmms-1985.65.

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DeMark, Ramon S., und Virgil W. Lueth. „A New Mexico occurrence of Sidwillite and other molybdenum minerals“. In 37th Annual New Mexico Mineral Symposium. Socorro, NM: New Mexico Bureau of Geology and Mineral Resources, 2016. http://dx.doi.org/10.58799/nmms-2016.516.

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Love, Dave, Robert Myers und Bruce Allen. „Uncommon gypsum morphologies and their occurrence in the Tularosa Basin“. In 29th Annual New Mexico Mineral Symposium. Socorro, NM: New Mexico Bureau of Geology and Mineral Resources, 2008. http://dx.doi.org/10.58799/nmms-2008.329.

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DeMark, Ramon S., und Paul F. Hlava. „A new occurrence of cyprine (blue idocrase) in New Mexico“. In 7th Annual New Mexico Mineral Symposium. Socorro, NM: New Mexico Bureau of Geology and Mineral Resources, 1986. http://dx.doi.org/10.58799/nmms-1986.73.

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Canales, Dylan, und Robert Sanders. „A new zeolite occurrence in the Bear Mountains, Socorro County, New Mexico“. In 27th Annual New Mexico Mineral Symposium. Socorro, NM: New Mexico Bureau of Geology and Mineral Resources, 2006. http://dx.doi.org/10.58799/nmms-2006.302.

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Фролов, Петр, Оксана Мясникова und Александр Савицкий. „Prospects of Karelian carbonate deposits for the production of correcting additives to cement blend based on upper devonian marls from the russian platform“. In Mineralogical and technological appraisal of new types of mineral products. Petrozavodsk: Karelian Research Center of RAS, 2019. http://dx.doi.org/10.17076/tm13_12.

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The possible use of carbonate rocks from some Karelian deposits for the production of correcting additives to raw cement blend from cement occurrences in the Leningrad and Novgorod districts (exemplified by the Babino occurrence) with insufficient standards for unaided exploitation are discussed.

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Francis, Dr Carl A., M. Darby Dyar und Ramon DeMark. „A fourth world occurrence of foitite at Copper Mountain, Taos County, New Mexico“. In 18th Annual New Mexico Mineral Symposium. Socorro, NM: New Mexico Bureau of Geology and Mineral Resources, 1997. http://dx.doi.org/10.58799/nmms-1997.202.

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Marinova, Irina, und Elena Tacheva. „Boiling assemblages in the Kupel occurrence, Krumovgrad goldfield, SE Bulgaria“. In The 1st International Electronic Conference on Mineral Science. Basel, Switzerland: MDPI, 2018. http://dx.doi.org/10.3390/iecms2018-05454.

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Berichte der Organisationen zum Thema "Mineral occurrence"

Bretzlaff, R. E., und J. A. Kerswill. Mineral occurrence database, Great Bear Magmatic Zone. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2016. http://dx.doi.org/10.4095/297587.

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Alexander, Jake. Cobalt Database of Utah. Utah Geological Survey, Mai 2023. http://dx.doi.org/10.34191/ofr-749.

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This report and accompanying database collate known cobalt mineral occurrences and geochemical data for the state of Utah. These data were compiled from the Utah Geological Survey’s Utah Mineral Occurrence System database (UMOS), the National Uranium Resource Evaluation Hydrogeochemical and Stream Sediment Reconnaissance program (NURE-HSSR; U.S. Geological Survey, 2004) geochemical database, the U.S. Geological Survey National Geochemical Database (NGDB; U.S. Geological Survey, 2016), and the Utah Geochemistry Database (UGDB; unpublished internal Utah Geological Survey database).

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Laramée, R. M., und R. E. Bretzlaff. CANMINDEX: a legacy mineral occurrence database of the Geological Survey of Canada. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/305864.

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McClenaghan, M. B., und S. A. Averill. Indicator mineral abundance data for a bedrock sample from the Little River antimony occurrence, Newfoundland and Labrador. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2014. http://dx.doi.org/10.4095/293931.

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Gandhi, S. S. Report on the geological and mineral occurrence map of the Mazenod Lake - Lou Lake area, Northwest Territories. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2013. http://dx.doi.org/10.4095/293348.

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Mills, Stephanie E., und Andrew Rupke. Critical Minerals of Utah, Second Edition. Utah Geological Survey, März 2023. http://dx.doi.org/10.34191/c-135.

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Utah is a state with diverse geology and natural resources, and this diversity extends to mineral resources that are deemed critical by the U.S. Department of the Interior. Utah’s critical mineral portfolio includes current producers, known resources, areas of past production, and undeveloped occurrences. This report, now in its second edition, summarizes the geographic and geologic distribution of critical minerals within Utah. Utah is notable for being the global leader in beryllium production; being the only domestic producer of magnesium metal; being one of only two states producing lithium (as of publication); and being a byproduct producer of tellurium, platinum, and palladium from the world-class Bingham Canyon mine, which is one of only two domestic tellurium producers. Utah has known resources of aluminum, fluorspar, germanium, gallium, indium, vanadium, and zinc, as well as past production and occurrences of many other critical minerals. In total, Utah currently produces 6 critical minerals, has known resources of 7 more, and hosts an additional 27 as past producers and/or occurrences with limited potential for economic development.

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McClenaghan, M. B., und D. E. Ames. Indicator mineral abundance data for bedrock and till from the footwall-type Cu-Ni-PGE Broken Hammer occurrence, Sudbury, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2013. http://dx.doi.org/10.4095/293032.

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Neyedley, K., J. J. Hanley, P. Mercier-Langevin und M. Fayek. Ore mineralogy, pyrite chemistry, and S isotope systematics of magmatic-hydrothermal Au mineralization associated with the Mooshla Intrusive Complex (MIC), Doyon-Bousquet-LaRonde mining camp, Abitibi greenstone belt, Québec. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328985.

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The Mooshla Intrusive Complex (MIC) is an Archean polyphase magmatic body located in the Doyon-Bousquet-LaRonde (DBL) mining camp of the Abitibi greenstone belt, Québec. The MIC is spatially associated with numerous gold (Au)-rich VMS, epizonal 'intrusion-related' Au-Cu vein systems, and shear zone-hosted (orogenic?) Au deposits. To elucidate genetic links between deposits and the MIC, mineralized samples from two of the epizonal 'intrusion-related' Au-Cu vein systems (Doyon and Grand Duc Au-Cu) have been characterized using a variety of analytical techniques. Preliminary results indicate gold (as electrum) from both deposits occurs relatively late in the systems as it is primarily observed along fractures in pyrite and gangue minerals. At Grand Duc gold appears to have formed syn- to post-crystallization relative to base metal sulphides (e.g. chalcopyrite, sphalerite, pyrrhotite), whereas base metal sulphides at Doyon are relatively rare. The accessory ore mineral assemblage at Doyon is relatively simple compared to Grand Duc, consisting of petzite (Ag3AuTe2), calaverite (AuTe2), and hessite (Ag2Te), while accessory ore minerals at Grand Duc are comprised of tellurobismuthite (Bi2Te3), volynskite (AgBiTe2), native Te, tsumoite (BiTe) or tetradymite (Bi2Te2S), altaite (PbTe), petzite, calaverite, and hessite. Pyrite trace element distribution maps from representative pyrite grains from Doyon and Grand Duc were collected and confirm petrographic observations that Au occurs relatively late. Pyrite from Doyon appears to have been initially trace-element poor, then became enriched in As, followed by the ore metal stage consisting of Au-Ag-Te-Bi-Pb-Cu enrichment and lastly a Co-Ni-Se(?) stage enrichment. Grand Duc pyrite is more complex with initial enrichments in Co-Se-As (Stage 1) followed by an increase in As-Co(?) concentrations (Stage 2). The ore metal stage (Stage 3) is indicated by another increase in As coupled with Au-Ag-Bi-Te-Sb-Pb-Ni-Cu-Zn-Sn-Cd-In enrichment. The final stage of pyrite growth (Stage 4) is represented by the same element assemblage as Stage 3 but at lower concentrations. Preliminary sulphur isotope data from Grand Duc indicates pyrite, pyrrhotite, and chalcopyrite all have similar delta-34S values (~1.5 � 1 permille) with no core-to-rim variations. Pyrite from Doyon has slightly higher delta-34S values (~2.5 � 1 permille) compared to Grand Duc but similarly does not show much core-to-rim variation. At Grand Duc, the occurrence of Au concentrating along the rim of pyrite grains and associated with an enrichment in As and other metals (Sb-Ag-Bi-Te) shares similarities with porphyry and epithermal deposits, and the overall metal association of Au with Te and Bi is a hallmark of other intrusion-related gold systems. The occurrence of the ore metal-rich rims on pyrite from Grand Duc could be related to fluid boiling which results in the destabilization of gold-bearing aqueous complexes. Pyrite from Doyon does not show this inferred boiling texture but shares characteristics of dissolution-reprecipitation processes, where metals in the pyrite lattice are dissolved and then reconcentrated into discrete mineral phases that commonly precipitate in voids and fractures created during pyrite dissolution.

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Ansell, H. G. MOFILE - a catalogue of Canadian mineral occurrences. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1994. http://dx.doi.org/10.4095/193960.

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Black, S. J., und A. N. Rencz. Industrial minerals in eastern Ontario: Clarendon Sillimanite Occurrence. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1987. http://dx.doi.org/10.4095/130332.

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