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Artykuły w czasopismach na temat „Geochemical studies”

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Data publikacji: 6 września 2023

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1

Demetriades, A., M. Birke, J. Locutura, A. B. Bel-lan, M. Duris i EuroGeoSurveys Geochemistry Expert Group EuroGeoSurveys Geochemistry Expert Group. "URBAN GEOCHEMICAL STUDIES IN EUROPE". Bulletin of the Geological Society of Greece 43, nr 5 (31.07.2017): 2338. http://dx.doi.org/10.12681/bgsg.11634.

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Urban soil is generally contaminated to a variable degree depending on its proximity to contamination sources. Traffic is one of the main sources of urban contamination; lead (Pb) from the use of leaded petrol, zinc (Zn) and cadmium (Cd) from tyre wear, antimony (Sb) from break pads, and the platinum group Nelements (PGEs) from the wear of catalytic converters, are some typical elements that often reach high concentrations in the urban environment. Lead was also a key ingredient in white paint, and in towns with a high proportion of white wooden houses very high concentrations were found in soil. Crematoria can or have emitted mercury (Hg). Coal and heavy oil fired municipal power and heating stations emit sulphur (S), silver (Ag), vanadium (V), bromine (Br) and barium (Ba). The use of impregnated wood may have resulted in high concentrations of arsenic (As), especially in kindergartens (nursery schools) and playgrounds. Building materials (plaster and paint) may also contain high concentrations of organic contaminants, especially polychlorinated biphenyls (PCBs), which again end up in urban soil. Coal and wood burning, the use of diesel fuel, and the production of coke, all lead to the emission of polycyclic aromatic hydrocarbons (PAHs). There exist countless other sources of local contamination in towns, and there is thus every reason to be concerned about the quality of the urban environment, and the suitability of soil for sensitive land uses, such as schools, playgrounds, parks and vegetable gardens. Contaminated urban soil may contaminate indoor dust and, therefore, to an increased human exposure to toxic chemicals. Consequently, the distribution of toxic contaminants in urban soil needs to be documented and known by city administration to avoid costly mistakes in land use planning, and further spreading of highly contaminated materials. The EuroGeoSurveys ‘Geochemistry’ Expert Group during the compilation of a proposal to the Directors for a European wide urban geochemistry project, using a harmonised sampling and analytical methodology, it discovered that many urban geochemical studies have been performed in Europe by National Geological Surveys, which are not known to the wider geoscientific community. Since, the results of these studies are directly related to our quality of life, the EuroGeoSurveys ‘Geo-chemistry’ Expert Group decided to publish at least one case study from each country in a book,which will be available in the second half of 2010. A concise description of some of these studies will be given in this paper.

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2

Church, M. R. "Geochemical studies in watersheds expanded". Eos, Transactions American Geophysical Union 72, nr 21 (1991): 237. http://dx.doi.org/10.1029/90eo00184.

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3

Alekseenko, Vladimir, Natalya Shvydkaya, Alexander Puzanov i Aleksey Nastavkin. "Landscape monitoring studies of the North Caucasian geochemical province". Journal of Mining Institute 243 (10.06.2020): 371. http://dx.doi.org/10.31897/pmi.2020.3.371.

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The data on the geochemical features of the bedrocks and soils of the province are given. Considerable attention is paid to regional abundances, as well as enrichment and dispersion factors of the chemical elements in landscapes. Using the example of the North Caucasus, it is shown that for such indicators as phytomass, geological, geomorphological, and geobotanical features, it is possible to make a preliminary outlining of regional structures corresponding to geochemical provinces. At the same time, a subsequent geochemical study of these structures remains mandatory. Upon determining certain geochemical associations, geochemical provinces can be basically distinguished; to a large extent, geochemical properties of these accumulated and scattered associations of elements contribute to the regional soil geochemistry. The results of long-term monitoring studies of the North Caucasus geochemical province have shown that the key features of the regional landscapes are due to the composition of bedrock and the presence of a large number of ore deposits and occurrences. The data obtained are the basis for assessing the state of the environment in conditions of increasing anthropogenic impact, and the established regional abundances can be used to assess the degree of pollution in agricultural, residential, and mining landscapes.

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4

Lodha, G. S., K. J. S. Sawhney, H. Razdan, D. P. Agrawal i N. Juyal. "Geochemical studies on Kashmir loess profiles". Journal of Earth System Science 96, nr 2 (wrzesień 1987): 135–45. http://dx.doi.org/10.1007/bf02839265.

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5

Carranza, Emmanuel John M. "Geochemical sampling for geological–environmental studies". Journal of Geochemical Exploration 111, nr 3 (grudzień 2011): 57–58. http://dx.doi.org/10.1016/j.gexplo.2011.09.010.

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6

G. Sakram, G. Sakram, G. Chandra Mouli, Sripada Narala, Soujanya Soujanya i Praveen Raj Saxena. "Hydro Geochemical Studies in Nagavali Micro Watershed, Vizianagaram District, Andhra Pradesh, India". Indian Journal of Applied Research 4, nr 8 (1.10.2011): 282–88. http://dx.doi.org/10.15373/2249555x/august2014/72.

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7

René, Milos. "Provenance studies of Moldanubian paragneisses based on geochemical data (Bohemian Massif, Czech Republic)". Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 242, nr 1 (11.01.2006): 83–101. http://dx.doi.org/10.1127/njgpa/242/2006/83.

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8

Troll, Georg, Elmar Linhardt i Rainer Skeries. "Petrographic and geochemical studies on country rock of the Bodenmais (Bavaria) sulphide deposit". Neues Jahrbuch für Geologie und Paläontologie - Monatshefte 1987, nr 12 (1.12.1987): 726–52. http://dx.doi.org/10.1127/njgpm/1987/1987/726.

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9

Ram Mohan, M., D. Srinivasa Sarma, Tarun C. Khanna, M. Satyanarayanan i A. Keshav Krishna. "Geochemical Studies in India: CSIR-NGRI Contributions". Journal of the Geological Society of India 97, nr 10 (październik 2021): 1240–50. http://dx.doi.org/10.1007/s12594-021-1853-5.

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10

Lee, Yung-Tan, Ju-Chin Chen, Kung-Suan Ho i Wen-Shing Juang. "Geochemical studies of tektites from East Asia". GEOCHEMICAL JOURNAL 38, nr 1 (2004): 1–17. http://dx.doi.org/10.2343/geochemj.38.1.

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11

M.C, Ong, Kamaruzzaman B.Y. i Joseph B. "Geochemical Studies of Setiu Lagoon, Terengganu, Malaysia". Malaysian Journal of Science 28, nr 2 (28.08.2009): 217–22. http://dx.doi.org/10.22452/mjs.vol28no2.11.

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12

Kostrovitsky, S. I., L. V. Solov’eva, D. A. Yakovlev, L. F. Suvorova, G. P. Sandimirova, A. V. Travin i D. S. Yudin. "Kimberlites and megacrystic suite: Isotope-geochemical studies". Petrology 21, nr 2 (marzec 2013): 127–44. http://dx.doi.org/10.1134/s0869591113020057.

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13

Somayajulu, B. L. K., J. M. Martin, D. Eisma, A. J. Thomas, D. V. Borole i K. S. Rao. "Geochemical studies in the Godavari estuary, India". Marine Chemistry 43, nr 1-4 (lipiec 1993): 83–93. http://dx.doi.org/10.1016/0304-4203(93)90217-c.

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14

Somayajulu, B. L. K., J. M. Martin, D. Eisma, A. J. Thomas, D. V. Borole i K. S. Rao. "Geochemical studies in the Godavari estuary, India". Marine Chemistry 46, nr 4 (lipiec 1994): 409. http://dx.doi.org/10.1016/0304-4203(94)90036-1.

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15

Cassidy, R. M., i C. Chauvel. "Modern liquid chromatographic techniques for geochemical studies". Chemical Geology 70, nr 1-2 (sierpień 1988): 173. http://dx.doi.org/10.1016/0009-2541(88)90701-2.

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16

Simanenko, L. F., V. V. Ratkin, V. A. Pakhomova i O. A. Eliseeva. "NI-CO ARSENIDES AND AG-BI TELLURIDES IN B-PB-ZN SKARNS OF THE PARTIZANSKOE DEPOSIT (DALNEGORSKY ORE DISTRICT, SIKHOTE-ALIN, RUSSIA)". Tikhookeanskaya Geologiya 42, nr 4 (2023): 61–75. http://dx.doi.org/10.30911/0207-4028-2023-42-4-61-75.

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Mineralogical and geochemical studies of the northeastern flank of the Partizanskoe deposit in the zone of its junction with the Dalnegorskoe borosilicate deposit revealed the superimposed Ni-Co arsenide and Ag-Bi telluride mineralization hosted in Pb-Zn ores of the Bolnichny ore body. The typomorphic features of arsenides and tellurides, the sequence and physicochemical conditions of their formation were studied. Rammelsbergite and hessite were found at the deposit for the first time. The authors assume that the arsenide and telluride assemblages formed after the completion of the main skarn-sulphide stage of ore formation. Together with the earlier mineralogical finds of large Bi nuggets and reniform aggregates of native As and Sb in the same junction area, the arsenide-telluride mineralization can be assigned to the geochemically unified Ag-Bi-Ni-Co-As(Sb) mineral assemblage, which in its geochemical features is a miniature of the ores of hydrothermal (five-element vein-type) deposits.

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17

Smellie, J. L., i P. Stone. "Geochemical characteristics and geotectonic setting of early Ordovician basalt lavas in the Ballantrae Complex ophiolite, SW Scotland". Earth and Environmental Science Transactions of the Royal Society of Edinburgh 91, nr 3-4 (2000): 539–55. http://dx.doi.org/10.1017/s0263593300008385.

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ABSTRACTThe consensus of several geochemical studies is a polygenetic origin for the basic volcanic sequence within the Ballantrae Complex ophiolite. This overall agreement masks differences of opinion regarding local geochemical interpretation, the possible correlation of structurally isolated lava tracts, and the degree of structural imbrication responsible for the juxtaposition of the various lava types. Newly acquired data (XRF, INAA, ICP-MS) provide the best evidence yet obtained for the presence of a MORB component and establish a wider distribution for primitive tholeiitic basalts with plate-margin characteristics than had been previously reported. The two principal within-plate sequences (well established from extensive coastal outcrop) are geochemically indistinguishable, with one considered to be the deeper water equivalent of the other. Lithofacies and geochemical similarities encourage correlation of some inland and sparsely exposed examples of within-plate basalt with the well-exposed coastal sequences, and all of this lava type may have originated from a single, ocean island volcano. The diversity of outcrops formed in within-plate and plate-margin geotectonic settings is combined within a dynamic reconstruction of a Tremadoc to Arenig arc-trench system with an active back-arc spreading region. The new reconstruction reconciles for the first time all of the known geochemical and published isotopic age evidence.

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18

Kulkova, Marianna, i Dmitry Subetto. "Editorial for the Special Issue “Environment and Geochemistry of Sediments”". Minerals 13, nr 5 (22.05.2023): 709. http://dx.doi.org/10.3390/min13050709.

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19

Kosheleva, N. E., I. K. Lur’e, M. I. Gerasimova i D. I. Mikhailov. "Model of a database for soil-geochemical studies". Moscow University Soil Science Bulletin 62, nr 2 (czerwiec 2007): 60–67. http://dx.doi.org/10.3103/s0147687407020020.

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20

Klusman, R. W. "Sample Design and Analysis for Regional Geochemical Studies". Journal of Environmental Quality 14, nr 3 (lipiec 1985): 369–75. http://dx.doi.org/10.2134/jeq1985.00472425001400030013x.

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21

Agharezaei, Mohammadreza, i Ardeshir Hezarkhani. "Geochemical Studies for Gold in Alut Anomaly District". International Journal of Science and Engineering Applications 6, nr 10 (31.10.2017): 302–6. http://dx.doi.org/10.7753/ijsea0610.1002.

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22

Bidzhiyev, R. A., G. G. Lyapina, T. A. Rozhnova i A. L. Vanin. "INTEGRATED SATELLITE AND GEOCHEMICAL STUDIES IN NORTHERN SIBERIA". International Geology Review 29, nr 7 (lipiec 1987): 867–74. http://dx.doi.org/10.1080/00206818709466183.

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23

Negroni, P., A. Reymond i J. Espitalié. "Geochemical and modeling studies of the Mauritania offshore". Organic Geochemistry 13, nr 1-3 (styczeń 1988): 175–79. http://dx.doi.org/10.1016/0146-6380(88)90037-x.

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24

韩, 国豪. "Comparative Studies on the Extraction of Geochemical Anomalies". Open Journal of Nature Science 03, nr 04 (2015): 232–40. http://dx.doi.org/10.12677/ojns.2015.34028.

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25

Kubrakova, I. V., i E. S. Toropchenova. "Microwave sample preparation for geochemical and ecological studies". Journal of Analytical Chemistry 68, nr 6 (29.05.2013): 467–76. http://dx.doi.org/10.1134/s1061934813060099.

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26

Chen, Ju-Chin. "Geochemical studies of basalts from the Philippine Sea". Journal of Southeast Asian Earth Sciences 6, nr 2 (styczeń 1991): 63–68. http://dx.doi.org/10.1016/0743-9547(91)90096-g.

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27

Joron, J. L., M. Treuil i L. Raimbault. "Activation analysis as a geochemical tool: Statement of its capabilities for geochemical trace element studies". Journal of Radioanalytical and Nuclear Chemistry 216, nr 2 (luty 1997): 229–35. http://dx.doi.org/10.1007/bf02033783.

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28

Yang, Xiao-Yong, Zheng Yong-Fei, Xue-Ming Yang, Xianghua Liu i Kuiren Wang. "Mineralogical and geochemical studies on the different types of turquoise from Maanshan area, East China". Neues Jahrbuch für Mineralogie - Monatshefte 2003, nr 3 (3.03.2003): 97–112. http://dx.doi.org/10.1127/0028-3649/2003/2002-0097.

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Liu, Changqing, Zongcheng Ling, Jiang Zhang, Zhongchen Wu, Hongchun Bai i Yiheng Liu. "A Stand-Off Laser-Induced Breakdown Spectroscopy (LIBS) System Applicable for Martian Rocks Studies". Remote Sensing 13, nr 23 (25.11.2021): 4773. http://dx.doi.org/10.3390/rs13234773.

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Laser-induced breakdown spectroscopy (LIBS) is a valuable tool for evaluating the geochemical characteristics of Martian rocks and was applied in the Tianwen-1 Mars exploration mission with the payload called Mars Surface Composition Detection Package (MarSCoDe). In this work, we developed a laboratory standoff LIBS system combined with a Martian simulation chamber to examine the geochemical characteristics of igneous rocks, with the intention to provide a reference and a basis for the analysis of LIBS data acquired by MarSCoDe. Fifteen igneous geological standards are selected for a preliminary LIBS spectroscopic study. Three multivariate analysis methods were applied to characterize the geochemical features of igneous standards. First, quantitative analysis was done with Partial Least Squares (PLS) and Least Absolute Shrinkage and Selection (LASSO), where the major element compositions of these samples (SiO2, Al2O3, T Fe2O3, MgO, CaO, K2O, Na2O, and TiO2) were derived. The predicted concentrations ((Fe2O3 + MgO)/SiO2, Fe2O3/MgO, Al2O3/SiO2, and (Na2O + K2O)/Al2O3) were used to identify the geochemical characteristics of igneous rocks. Also, PCA, an unsupervised multivariate method was tested to directly identify the igneous rock lithology with no prior quantification. Higher correlation (0.82–0.88) are obtained using Principal Component Analysis (PCA) scores than using predicted elemental ratios derived by PLS and LASSO, indicating that PCA is better suited to identify igneous rock lithology than via quantitative concentrations. This preliminary study, using this LIBS system, provides suitable methods for the elemental prediction and geochemical identification of martian rocks, and we will use extended geologic standards and continue to build a robust LIBS spectral library for MarSCoDe based on this LIBS system in the future.

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GABLINA, IRINA. "Role of geochemical barriers in forming sulfide ores in various geological environments". Domestic geology, nr 2 (27.05.2021): 63–73. http://dx.doi.org/10.47765/0869-7175-2021-10014.

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Based on long-term studies of cupriferous sandstone and shale deposits, as well as deepsea sulfide ores, various types of geochemical barriers where sulfides form are shown. Cupriferous sandstones and shales form as metals precipitate from redbed reservoir waters on H2S geochemical barrier. Syngenetic and epigenetic barrier types are identified. Oceanic sulfide ores from the Central Atlantic region were studied; as a result, a new hydrothermal-metasomatic sediment-hosted mineralization type was found, along with previously known sulfide ore types (massive ores on the seafloor and stockwork ores in substrate rocks). Geochemical seafloor sulfide formation environments and those in biogenic carbonate bottom sediments are examined.

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31

MAKISHIMA, Akio. "A review of isotope geochemical studies for Iceland. I. Isotope-geochemical characterization of Icelandic hot spot." JOURNAL OF MINERALOGY, PETROLOGY AND ECONOMIC GEOLOGY 90, nr 11 (1995): 379–87. http://dx.doi.org/10.2465/ganko.90.379.

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Ivanov, Alexey, Evgeny Loskutov, Michil Ivanov i Anatolii Zhuravlev. "Petrography, Geochemical Features and Absolute Dating of the Mesozoic Igneous Rocks of Medvedev and Taezhniy Massifs (Southeast Russia, Aldan Shield)". Minerals 12, nr 12 (27.11.2022): 1516. http://dx.doi.org/10.3390/min12121516.

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The paper presents the results of the petrographic and geochemical studies of igneous rocks of the Medvedev and Taezhniy massifs, including their first absolute dating. The massifs are located in central Nimnyr block of the n shield within the Leglier ore cluster of the Evotinskiy ore district (Southeast Russia, Aldan Shield). For the first time, the three-phase structure of the Medvedev massif has been defined, as observed in our expedition and petrographic studies. Rocks from the three phases of the Medvedev massif include quartz syenites, syenites, and monzonites, and rocks from the two phases of the Taezhniy massif include quartz monzonites and syenites. Geochemically, the rocks are close to volcanic island arcs, the formation of which was related by subducted oceanic crust of the Mongol–Okhotsk Ocean. The defined duality of the geochemical compositions of the igneous rocks of the massifs may be due to the presence of both mantle and crustal sources; however, it is most likely that these rocks resulted from the melting of a mixed mantle source or the latter was contaminated by the crust with further differentiation of melts in intermediate crust chambers. Additionally, geochemical characteristics suggest that the analyzed rocks are close to latite and shoshonite derivatives and can be considered as part of the monzonite–syenite formation type. The first identified periods of formation of igneous rocks in the Medvedev massif are 122.0–118.0 Ma and Taezhniy 117.5–114.5 Ma, which correspond to the Early Cretaceous (Aptian).

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Li, Jie, Qingjie Gong, Bimin Zhang, Ningqiang Liu, Xuan Wu, Taotao Yan, Xiaolei Li i Yuan Wu. "Construction, Test and Application of a Tungsten Metallogene Named MGW11: Case Studies in China". Applied Sciences 13, nr 1 (2.01.2023): 606. http://dx.doi.org/10.3390/app13010606.

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Geochemical gene is a new promising concept proposed recently in the discrimination and traceability of geological materials and is also a useful tool to recognize geochemical anomalies in mineral exploration. Based on the lithogenes of LG01 and LG03, geological materials can be classified into nine types of LG_CR compositionally. With respect to geological materials with 11 types of LG_CR, in order to eliminate the lithological influence and to further narrow the prospecting target area, a tungsten metallogene named MGW11 is proposed for geochemical tungsten exploration after the tungsten metallogene MGW. Six weathering profiles of 11 types of LG_CR developed on granitic intrusions in different areas in China are selected to test the stable properties such as heredity and inheritance of MGW11 and MGW. The results indicate that MGW11 and MGW metallogenes illustrate stable properties during rock weathering regardless of weathering degrees, although gene variations of MGW11 and MGW are also observed during extreme weathering. Based on the regional geochemistry survey data in the Lianyang area in south China, where stream sediments are mostly 11 types of LG_CR compositionally, geochemical maps of mineralization similarities of MGW11 and MGW are contoured, and the anomaly areas are determined on the mineralization similarity value of ≥40%. Comparing the tungsten deposits and anomaly areas determined on MGW11 and MGW metallogenes spatially, a total of six polymetallic W deposits recognized in the study area are all located in the anomaly areas. Therefore, mineralization similarities of MGW11 and MGW can be viewed as useful integrated indices on geochemical tungsten exploration. In areas with 11 types of LG_CR compositionally, anomaly areas determined on the MGW11 are smaller than those on the MGW, which indicates that MGW11 is more efficient than MGW in targeting W deposits during tungsten prospecting because of the elimination of the lithological influence.

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Valchuk-Orkusha, Oksana. "Geochemical patterns of road landscapes". Visnyk of the Lviv University. Series Geography, nr 48 (23.12.2014): 215–19. http://dx.doi.org/10.30970/vgg.2014.48.1342.

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The possibilities of distinguishing the structure of road landscapes geochemical sections, units and areas given their characteristics, showed that these geochemical patterns are not always consistent with the types of areas, but require detailed studies because they determine the environmental condition of the modern road landscapes not only skirts, but any region of Ukraine. Key words: skirts, road landscape geochemical structure, segments, sites, areas, economic condition.

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35

Rózsa, Péter, Gyula Szö?r, Zoltán Elekes, Bernard Gratuze, Imre Uzonyi i Árpád Z. Kiss. "Comparative geochemical studies of obsidian samples from various localities". Acta Geologica Hungarica 49, nr 1 (1.03.2006): 73–87. http://dx.doi.org/10.1556/ageol.49.2006.1.5.

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SEYAMA, Haruhiko, i Mitsuyuki SOMA. "Surface-analytical Studies on Environmental and Geochemical Surface Processes". Analytical Sciences 19, nr 4 (2003): 487–97. http://dx.doi.org/10.2116/analsci.19.487.

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Honda, Masatoshi, Sadayo Yabuki i Hiroshi Shimizu. "Geochemical and isotopic studies of aeolian sediments in China". Sedimentology 51, nr 2 (15.04.2004): 211–30. http://dx.doi.org/10.1111/j.1365-3091.2004.00618.x.

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Geng, Ansong, i Zewen Liao. "Kinetic studies of asphaltene pyrolyses and their geochemical applications". Applied Geochemistry 17, nr 12 (grudzień 2002): 1529–41. http://dx.doi.org/10.1016/s0883-2927(02)00053-7.

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Epov, M. I., E. V. Balkov, M. A. Chemyakina, A. K. Manshtein, Yu A. Manshtein, D. V. Napreev i K. V. Kovbasov. "Frozen mounds in Gorny Altai: geophysical and geochemical studies". Russian Geology and Geophysics 53, nr 6 (czerwiec 2012): 583–93. http://dx.doi.org/10.1016/j.rgg.2012.04.006.

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Chen, Jun, i GaoJun Li. "Geochemical studies on the source region of Asian dust". Science China Earth Sciences 54, nr 9 (wrzesień 2011): 1279–301. http://dx.doi.org/10.1007/s11430-011-4269-z.

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Łyskowski, Mikołaj, i Marta Wardas. "Georadar investigations and geochemical analysis in contemporary archeological studies". Geology, Geophysics & Environment 38, nr 3 (2012): 307. http://dx.doi.org/10.7494/geol.2012.38.3.307.

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REIMOLD, Wolf Uwe, Christian KOEBERL, Robert M. HOUGH, Iain MCDONALD, Alex BEVAN, Kassa AMARE i Bevan M. FRENCH. "Woodleigh impact structure, Australia: Shock petrography and geochemical studies". Meteoritics & Planetary Science 38, nr 7 (lipiec 2003): 1109–30. http://dx.doi.org/10.1111/j.1945-5100.2003.tb00301.x.

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Facetti-Masulli, J. F., P. Kump, V. Romero de González i Zulma de Díaz. "Geochemical studies of Guarani ethnic groups pottery with XRF". Journal of Radioanalytical and Nuclear Chemistry 286, nr 2 (19.08.2010): 489–94. http://dx.doi.org/10.1007/s10967-010-0777-0.

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Hirose, K. "Geochemical studies on the Chernobyl radioactivity in environmental samples". Journal of Radioanalytical and Nuclear Chemistry Articles 197, nr 2 (listopad 1995): 331–42. http://dx.doi.org/10.1007/bf02036009.

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Flitsiyan, E. S. "Using the activation radiography in geological and geochemical studies". Journal of Radioanalytical and Nuclear Chemistry Articles 168, nr 1 (luty 1993): 69–81. http://dx.doi.org/10.1007/bf02040879.

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Maceachern, I. J., i R. R. Stea. "Geochemical studies on gold in till in Nova Scotia". Journal of Geochemical Exploration 29, nr 1-3 (styczeń 1987): 425–26. http://dx.doi.org/10.1016/0375-6742(87)90115-4.

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Duller, P. R., i J. D. Floyd. "Turbidite geochemistry and provenance studies in the Southern Uplands of Scotland". Geological Magazine 132, nr 5 (wrzesień 1995): 557–69. http://dx.doi.org/10.1017/s0016756800021221.

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AbstractRegional lithogeochemical data from the Southern Uplands have been used to characterize a distinctive stratigraphy across this region. A suite of 840 point-counted and petrographically classified greywacke samples were used to establish chemical fingerprints for a series of greywacke-dominated lithostratigraphical units. These fingerprints were then used to evaluate a further 1455 greywacke samples collected throughout the Southern Uplands and Longford Down and enabled a series of strike-parallel geochemical tracts to be defined.Four principal geochemical groups are recognized, relating to cratonic- and volcanic-derived greywacke provenances and both carbonate-rich and hydrothermally altered greywackes. Volcanic-derived units display higher Ti, Fe, Mg, Ca, Na, Mn, Cr, Ga, Ni, Sr, V and Zn values than their cratonic counterparts, which, with the exception of the carbonate-rich Hawick Group, display higher Si, K, La, Nb, Rb, Th and Zr. Volcaniclastic greywackes display REE patterns dissimilar to typical post-Archean upper crust, but similar to their andesitic components, whereas cratonic groups have REE patterns close to that of upper crust. Systematic strike-parallel geochemical variation in the Southern Uplands is controlled by petrographical differences which directly reflect provenance, with individual lithostratigraphical units derived from variable mixtures of ophiolitic, calc-alkaline, acid-igneous, low-grade metamorphic and carbonate-rich detritus.

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Quye-Sawyer, Jennifer, Veerle Vandeginste i Kimberley J. Johnston. "Application of handheld energy-dispersive X-ray fluorescence spectrometry to carbonate studies: opportunities and challenges". Journal of Analytical Atomic Spectrometry 30, nr 7 (2015): 1490–99. http://dx.doi.org/10.1039/c5ja00114e.

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Alves, Carlos. "Scanning Electron Microscopy Studies of Neoformations on Stony Materials of Modern Building Works". Microscopy and Microanalysis 19, nr 5 (14.08.2013): 1241–47. http://dx.doi.org/10.1017/s1431927613012701.

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AbstractThe built environment is subjected to several pollutants under variable environmental conditions defined by diverse geochemical systems. These geochemical systems promote the occurrence of neoformations that can have a detrimental effect on surfaces of the building materials. Hence, the study of neoformations helps in the understanding of weathering processes that affect built structures. In the present paper we present a scanning electron microscopy study of macroscopic manifestations of neoformations detected during an extensive visual survey of several modern architectural works in urban areas of northern and central Portugal. The studies performed suggest that cementitious materials play an important role as a source of pollutants for the most common neoformations such as carbonate rich stains and coatings, as well as salt efflorescences of alkaline sulphates and carbonates. There are also indications of contributions from organic sources for alkaline nitrates and atmospheric pollution for gypsum-rich black crusts. Other less common neoformations include phosphate aggregates and silica stains that represent interesting indicators of the geochemical systems in built environments. In the case of carbonate-rich coatings, indications of recurrence related to the circulation of carbonate forming solutions relevant to the maintenance of built surfaces were detected.

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Ostroukhov, Sergey B., Nikita V. Pronin, Irina N. Plotnikova i Ruslan K. Khairtdinov. "A new method of «geochemical logging» for studying Domanic deposits". Georesursy 22, nr 3 (30.09.2020): 28–37. http://dx.doi.org/10.18599/grs.2020.3.28-37.

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Based on the study of the rocks of the Semiluksky horizon from the northwestern slope of the South Tatar arch (Tatarstan Republic), new data on the ratio of scattered organic matter, carbonate and siliceous components in domanicite rocks were obtained. Based on the results of geochemical studies of the bitumoids of these rocks, new information was obtained on the distribution patterns of aromatic biomarkers in rocks of various lithological composition. Peculiarities of distribution of paleonyerathan and isorenierathan in such rocks are revealed. Due to the use of aromatic biomarkers, a number of new geochemical coefficients have been developed, which make it possible to characterize not only Domanic strata along the sediment section, but also the processes of their transformation, starting from the stage of biota formation. The substantiation of the use of these geochemical coefficients when carrying out geochemical logging along the well column to establish the boundaries of the Domanic strata formation and productive intervals in them, as well as to assess the facies conditions of their formation, is given. At the same time, the patterns established by these coefficients correlate well with other geochemical and geological parameters. The studies performed have shown that at least two types of organic matter are present in the domanicite sequence: migrational, more mature and thermocatalytically transformed, and syngenetic, less mature with a low degree of thermocatalytic transformation. The application of the developed geochemical coefficients determines a new approach to the use of «geochemical logging» in the complex of express logging while drilling. When studying cuttings, these coefficients make it possible to identify reservoir intervals, zones of fracturing and decompression, containing traces of migrational hydrocarbon fluids, moved hydrocarbons, which may indicate the presence of oil deposits. The integration of geochemical studies of cuttings with its rapid study by pyrolysis and X-ray analysis methods can significantly increase the accuracy of identifying interlayers with a high content of organic matter in the section of domanicite rocks, as well as potential reservoirs with moved migrational hydrocarbons.

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