Relevant bibliographies by topics / Elemental geochemistry

Academic literature on the topic 'Elemental geochemistry'

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Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "Elemental geochemistry"

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Hanson, B. "GEOCHEMISTRY: Elemental Traces." Science 307, no. 5713 (February 25, 2005): 1171d. http://dx.doi.org/10.1126/science.307.5713.1171d.

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Bounakhla, M., K. Embarch, F. Zahry, E. Bilal, and P. Kump. "Capabilities of elemental analysis by EDXRF for geochemistry." Journal of Radioanalytical and Nuclear Chemistry 275, no. 3 (October 13, 2007): 467–78. http://dx.doi.org/10.1007/s10967-005-6698-7.

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Kiage, Lawrence M., Meghan Howey, Joel Hartter, and Michael Palace. "A late Holocene record of human impacts on tropical environments from non-pollen palynomorphs, Albertine Rift, western Uganda." Quaternary Research 93 (October 22, 2019): 172–86. http://dx.doi.org/10.1017/qua.2019.53.

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AbstractNon-pollen palynomorphs and elemental geochemistry data from Lake Kifuruka in western Uganda provide evidence of environmental change in the tropical African region since the beginning of the Holocene. The multi-proxy record presented here shows that dry conditions dominated the end of the Pleistocene evidenced by calcium enriched sediments and suppressed fungal taxa activity. Moist conditions dominated the early Holocene and persisted until just after 1960 cal yr BP. Elevated frequencies of individual fungal spore taxa associated with herbivory and soil erosion, including Sordaria-type, Sporormiella-type, Chaetomium-type, and Glomus-type, about 4300 cal yr BP suggests a significant environmental change that could be linked to human activities. A convergence of multiple proxy data, including microscopic charcoal, elemental geochemistry, and fungal spores, strongly support the occurrence of anthropogenic forest disturbance in the Albertine Rift about 4300 cal yr BP.
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Riley, David A., Tim J. Pearce, Eliza Mathia, Ken Ratcliffe, and John Martin. "The application of elemental geochemistry to UK onshore unconventional plays." Geological Society, London, Petroleum Geology Conference series 8, no. 1 (September 26, 2016): 585–94. http://dx.doi.org/10.1144/pgc8.8.

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AbstractThe Namurian and Westphalian sequences from the onshore well Scaftworth-B2, located in the Gainsborough Trough, central England, have been analysed for whole-rock inorganic geochemical data via inductively coupled plasma optical emission spectrometry (ICP-OES) and mass spectrometry (MS). The changes within key elements, and elemental ratios, results in a chemostratigraphic zonation scheme consisting of eight chemostratigraphic sequences and 13 chemostratigraphic packages, providing the type zonation for the Bowland Shale and overlying formations. Mineralogical data are provided by whole rock X-ray diffraction (XRD) and are used to calibrate the mineral modelling in order to generate a modelled mineral log for the study well. Furthermore, the modelled mineralogy is then used to calculate a relative brittleness for the samples, which can then be collaborated with traditional rock properties data at a later date. Elemental data can also be used to model the relative abundance of detrital quartz and biogenic silica; while total silicon is detected by ICP, biogenic silica is not detected by XRD owing to its amorphous nature. Enrichment factors calculated from the inorganic elemental data suggest that the sediment was deposited in an unrestricted marine setting, which experienced periods of anoxia.
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Tolu, Julie, Johan Rydberg, Carsten Meyer-Jacob, Lorenz Gerber, and Richard Bindler. "Spatial variability of organic matter molecular composition and elemental geochemistry in surface sediments of a small boreal Swedish lake." Biogeosciences 14, no. 7 (April 3, 2017): 1773–92. http://dx.doi.org/10.5194/bg-14-1773-2017.

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Abstract. The composition of sediment organic matter (OM) exerts a strong control on biogeochemical processes in lakes, such as those involved in the fate of carbon, nutrients and trace metals. While between-lake spatial variability of OM quality is increasingly investigated, we explored in this study how the molecular composition of sediment OM varies spatially within a single lake and related this variability to physical parameters and elemental geochemistry. Surface sediment samples (0–10 cm) from 42 locations in Härsvatten – a small boreal forest lake with a complex basin morphometry – were analyzed for OM molecular composition using pyrolysis gas chromatography mass spectrometry for the contents of 23 major and trace elements and biogenic silica. We identified 162 organic compounds belonging to different biochemical classes of OM (e.g., carbohydrates, lignin and lipids). Close relationships were found between the spatial patterns of sediment OM molecular composition and elemental geochemistry. Differences in the source types of OM (i.e., terrestrial, aquatic plant and algal) were linked to the individual basin morphometries and chemical status of the lake. The variability in OM molecular composition was further driven by the degradation status of these different source pools, which appeared to be related to sedimentary physicochemical parameters (e.g., redox conditions) and to the molecular structure of the organic compounds. Given the high spatial variation in OM molecular composition within Härsvatten and its close relationship with elemental geochemistry, the potential for large spatial variability across lakes should be considered when studying biogeochemical processes involved in the cycling of carbon, nutrients and trace elements or when assessing lake budgets.
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Gill, Thomas E., Dale A. Gillette, Tezz Niemeyer, and Russell T. Winn. "Elemental geochemistry of wind-erodible playa sediments, Owens Lake, California." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 189, no. 1-4 (April 2002): 209–13. http://dx.doi.org/10.1016/s0168-583x(01)01044-8.

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Naeem, Kashif, Wasim Yawar, Tariq M. Bhatti, and Bashir Mohammad. "Elemental profile of black shales." Chinese Journal of Geochemistry 30, no. 2 (April 26, 2011): 217–19. http://dx.doi.org/10.1007/s11631-011-0503-9.

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McLennan, S. M., R. B. Anderson, J. F. Bell, J. C. Bridges, F. Calef, J. L. Campbell, B. C. Clark, et al. "Elemental Geochemistry of Sedimentary Rocks at Yellowknife Bay, Gale Crater, Mars." Science 343, no. 6169 (December 9, 2013): 1244734. http://dx.doi.org/10.1126/science.1244734.

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Kontorovich, A. E., L. I. Bogorodskaya, L. S. Borisova, L. M. Burshtein, Z. R. Ismagilov, O. S. Efimova, E. A. Kostyreva, et al. "Geochemistry and catagenetic transformation of kerogen from the bazhenov horizon." Геохимия 64, no. 6 (June 26, 2019): 585–93. http://dx.doi.org/10.31857/s0016-7525646585-593.

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A representative suite of 276 samples was used to study the isotopic and element geochemistry of kerogens from the Bazhenov horizon (Bazhenov Formation and its time equivalents) of the West Siberian sedimentary basin and to construct maps reflecting changes in the elemental composition of kerogen. The elemental composition of kerogen was used to determine the types of organic matter (H and C contents), the initial components of the living matter, the sources of kerogen (H and N contents), diagenetic history of organic matter (S content), the level of catagenetic transformation (C and O contents). Kerogen from the central, western and southern regions of the West Siberian basin toward the boundary of the Bazhenov horizon pinch-out shows strong enrichment in hydrogen (up to 8–9%) and 12С (δ13С‰ from -35 to -29), suggesting its derivation from the polymer lipids of aquatic origin. Kerogen from the Bazhenov horizon (catagenetic grade MC1) in the northeast of the basin contains much lower hydrogen concentrations (2–4%). A map of organic matter types in the Bazhenov horizon was constructed.
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Dubey, P. N., B. P. Bhaskar, P. Chandran, B. Singh, and B. K. Mishra. "Geochemistry of some ferruginous soils of Kerala, India." Journal of Applied and Natural Science 8, no. 1 (March 1, 2016): 196–207. http://dx.doi.org/10.31018/jans.v8i1.773.

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The four representative ferruginous soils on lateritic cover developed over Precambrian rocks in parts of Kottayam of Kerala were studied to understand the weathering pattern and genesis through geochemistry. These soils are strongly to moderately acidic, reddish brown with low Cation exchange capacity CEC and base saturation having SiO2 - 33 to 57%, Al2O3 - 16-31%, Fe2O3 - 8 to 15% and TiO2 -0.7 to 1.4%. Kanjirapalli (P3) and Athirampuzha (P4) soil series were more intensely weathered as compared to the Kinalur (P1) and Chingavanam series (P2) with silica to alumina -iron ratio less than 2 and had a significant negative relationship with Chemical index of alteration CIA ( -0.75**), Harnois index ( -0.678**), Richie index (-0.953**) and Plagioclase Index of Weathering (-0.705**). The trace elemental concentration ranges were above the values of world soils having an enrichment index more than 1 in Kanjirapalli series (P3) and Ni contamination in genetic horizons (Ni > 200µgg-1 ). The cluster analysis showed similar major oxide concentration pattern in Group -1 and Group - 2 but varied in trace elemental pattern with Cr > Ba > Cu in Group - 1 and Cu > Cr > Ba in Group- 2 soils whereas Zr > Ni > Mn in Group - 3 to Ni > Mn > Zr in Group - 4 soils. The study further showed that differential rate of weathering in soils under tropical climate was further accelerated due to anthropogenic activities such as improper land use practices and deforestation on sleep slopes.
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Dissertations / Theses on the topic "Elemental geochemistry"

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Basaham, Ali Said. "Elemental partitioning in marine sediments." Thesis, University of Liverpool, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329422.

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Fair, Alexandria C. "Elemental Cycling in a Flow-Through Lake in the McMurdo Dry Valleys, Antarctica: Lake Miers." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1413291502.

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Saad, Emily M. "Elemental, isotopic, and particle fingerprinting of dust sources in the San Francisco Peaks, Arizona." Thesis, Northern Arizona University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1537808.

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This study examines dust in the San Francisco Peaks located on the Colorado Plateau of northern Arizona, USA. Sample dusts were collected from potholes on Humphreys Peak (35o20'22"N, 111o41'42"W) in order to detect exogenous material and constrain dust sources. Bulk dust and local rock were characterized by Sr and Nd isotope fingerprints as well as elemental composition. Sr and Nd isotope ratios were analyzed by MC-ICP-MS; trace element concentrations were analyzed by Q-ICP-MS. Mineralogical analyses were also performed in an effort to characterize individual particles. Mineral grains were separated from bulk samples by conventional heavy mineral separations. The heavy fraction was imaged and characterized by SEM/EDX.

Both the isotopic and elemental bulk analyses indicated that the dust composition reflected not only a weathered local rock material but also exogenous material of continental crust origin. The dust was characterized by an average 87Sr/86Sr ratio of 0.7095 ± 0.0010 and an average ε Nd of -7.13 ± 0.97. These signatures systematically and significantly deviate from the isotope fingerprints of the local rock, which exhibited an average 87Sr/86Sr ratio of 0.7037 ± 0.0002 and an average εNd of -2.43 ± 0.43. The negative correlation between εNd and 87Sr/86Sr is consistent with two component mixing of rock evolved from a mantle source and continental crust derived material.

Several geologically relevant trace elements were found to have significantly different average concentrations in the dust than in the local rock samples. Furthermore, the elemental abundances of most elements in the dust samples suggested a mixture of local rock and continental crust end members with the exception of Pb, which indicated an anthropogenic influence exhibiting enrichment factors between 1.65 and 7.44.

The mineral analysis provided further evidence of exogenous material and offered the opportunity for further constraint of the sources. Zircons were identified only in the dust and will be analyzed for U-Pb signatures in order to characterize the isotopic fingerprint of individual mineral grains, which will better distinguish external sources. Diatom skeletons were also found exclusively in the dust samples and offer a unique opportunity to more specifically implicate sources through a diatom assemblage.

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Dowall, David Phillip. "Elemental and isotopic geochemistry of kimberlites from the Lac de Gras field, northwest territories, Canada." Thesis, Durham University, 2004. http://etheses.dur.ac.uk/3065/.

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Detailed major/trace element and high-precision Hf-Nd-Sr isotope data has been acquired for 86 samples of kimberlites from the recently discovered Lac de Gras kimberlite field in the Northwest Territories, Canada, plus 23 samples from other Canadian kimberlite occurrences. This constitutes the most comprehensive geochemical database available for kimberlites at the present time, and allows detailed comparisons to be made with the well-documented kimberlites of the Kaapvaal craton, southern Africa. Major and trace element data shows that some Lac de Gras kimberlites have interacted extensively with continental crust, whereas others are minimally contaminated with crust but have physically incorporated large quantities (˃30%) of lithospheric mantle peridotite. Fresh, minimally-contaminated kimberlites from Lac de Gras have both elemental and isotopic characteristics that are transitional relative to those typical of southern African Group I and II kimberlites. The Hf-Nd isotope variations of these samples also define a linear array that strongly suggests mixing of two or more components/reservoirs within the mantle. Isotopic mixing models and mass balance considerations constrain the most likely candidate components/reservoirs to be depleted sub-continental lithospheric mantle and a component with an isotopically-enriched, negative ΔɛHf signature that is derived from beneath the lithosphere. Such a component has previously been identified in southern African kimberlites, indicating that it is globally extensive within the mantle. Its resfriction to magmas generated at great depths, and its unusual Hf isotope signature also suggest that it may reside in isolation at some mantle boundary layer. Ancient oceanic crust, generated by melting in the presence of garnet and subsequently subducted and stored below the lithosphere, could evolve to negative ΔɛHf compositions. Melts of this material, variably recombined with the depleted, garnet- rich melting residua that constitute the lithosphere, can then account for the Hf-Nd kimberiite isotopic array. Trace element characteristics, such as K and Sr anomalies, are consistent with those of OIB-like magmas derived from within the convecting mantle.
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Popelka-Filcoff, Rachel S. "Applications of elemental analysis for archaeometric studies analytical and statistical methods for understanding geochemical trends in ceramics, ochre and obsidian /." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4495.

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Thesis (Ph. D.) University of Missouri-Columbia, 2006.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 7, 2007) Includes bibliographical references.
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Calado, Bruno de Oliveira. "Geoquímica elemental e isotópica (Sr e Nd) como traçadores de poluentes antrópicos, caso de estudo: fosfogesso de Cubatão (SP)." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/44/44142/tde-19082008-082411/.

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O objetivo deste estudo foi aplicar técnicas de geoquímica de elementos maiores, menores e isótopos de Sr e Nd para identificar contaminação por fosfogesso em sedimentos fluviais da bacia hidrográfica Mogi/Piaçaguera. Para isto, foram analisados perfis de sedimento das margens dos rios Cubatão, Pereque, Mogi (montante, meio e jusante), Piaçaguera e Jurubatuba, inseridos no alto estuário santista, assim como solos, rochas e águas superficiais. Os métodos utilizados foram fluorescencia e difratometria de raios-x, microscopia ótica e analises isotópicas de Sr e Nd. Os resultados demonstraram fator de enriquecimento de Sr, Nd, Nb, La, F e Ce nos sedimentos superficiais do Rio Mogi jusante, comparado aos demais sedimentos fluviais analisados. As composições isotópicas dos sedimentos fluviais regionais foram dentro do padrão das rochas e solos da bacia hidrográfica. A exceção se deve aos sedimentos fluviais superficiais do Rio Mogi jusante que apresentaram assinaturas química e isotópica semelhantes do fosfogesso. O cálculo de proporção de mistura de composições isotópicas de Sr e Nd proveniente do fosfogesso indicou significativa discrêpancia para os dois métodos, de até 6% para Sr e 35% para Nd. Pelo contrário, diagramas 143Nd/144Nd e 87Sr/86Sr apresentaram proporções menores de 10%, coerentes com estudo da literatura que estimou de 13% a 18% a solubilização do fosfogesso em água. A normalização das composições isotópicas com a água do mar (e87Sr) dos resultados para extração parcial (ácido acético) indicou valores de e87Sr semelhantes para solos, sedimentos e águas superficiais da bacia hidrográfica, inclusive, levanta-se hipotese da influência da maré nos sedimentos do Rio Jurubatuba, com padrão isotópico semelhante da água do mar. Distintamente, confirmaram-se assinaturas isotópicas do fosfogesso nos sedimentos do Rio Mogi jusante. Em suma, isotopos de Sr e Nd demonstraram ser importantes ferramentas na identificação de plumas de contaminação antrópica, como também na identificação das prováveis fontes destas anomalias.
This objective of this study was applying geochemical techniques of major and minor elements, aswell as Sr. And Nd isotopes to identify contamination by phosphogypsum in fluvial sediments in the hydrografic basin of Mogi/Piaçaguera. Profiles of sediments from Cubatão, Pereque, Mogi (upstream,middle and downstream), Piaçaguera and Jurubatuba rivers margins, inserted in the high Santista stuary, as well as soils, rocks and superfial waters were analysed. The methods used were fluorescence and difratometria of X-rays, optical microscopy and isotopic analyses of Sr and ND. The results showed a factor of enrichment of Sr. Nd. NB, La, F and Ce in surface sediments of the Rio Mogi jusante, compared to other fluvial sediments analysed. The isotopic compositions of regional fluvial sediments were in accordance with rocks pattern and the hydrografic basin soils. The exception is due to surface fluvial sediments of the Rio Mogi jusante, which showed chemical and isotopic signatures similar to phosphogypsum. The calculation of proportion of isotopic composition mixtures of Sr. And Nd resulted from phosphogypsum indicated a significative discrepance for these two methods of up to 6% to Sr and 35% to Nd. On the contrary, 143Nd/144Nd and 87Sr/86Sr dyagrams presented minor proportions of 10% in coherence with the literature study, which estimated 13% to 18% the solubilization of phosphogypsum in water. The isotopic compositions normalization with sea water (e87Sr) of results for partial extraction (accectic acid) showed the value of e87Sr similar for soils, sediments and surface waters of the hydrografic basin. The hypotesis of the tidal influence in sediments of Rio Jurubatuba was arised, with a isotopic pattern similar to sea water. In a distinct way, the isotopic signatures of phosphogypsum in sediments of Rio Mogi jusante were confirmed. In summary,isotopes of Sr and Nd showed that are significant tools in the identification of plumas of antropic contamination, as well as in the identification of probable sources of these anomalies.
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Brens, Raul Jr. "U-Th-Ba Elemental Fractionation during Partial Melting of Crustal Xenoliths and its Implications for U-series Disequilibria in Continental Arc Rocks." FIU Digital Commons, 2011. http://digitalcommons.fiu.edu/etd/406.

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Understanding U-series isotopic disequilibria of partially melted crust is integral for determining the effect that crustal assimilation has on the U-series signature of magmas. In this work, U, Th and Ba (as a proxy for Ra) elemental abundances were gathered on the quenched glass in partially melted crustal xenoliths of granitic composition using microbeam techniques. The crustal xenoliths, which are found in basaltic lava, from Mirador Volcano in Chile, are old, and can be assumed to be at secular equilibrium, whereas melting occurred during eruption of Mirador in 1979. A comparison of the ratios Ba/Th and U/Th in the partial melts with those of the whole rock reveal how much fractionation has occurred during partial melting. Different ratios of U, Th and Ba compared to the whole rock substantiate fractionation via partial melting. Thus, assimilation of partial melts of crust can play a role in U-series isotopic disequilibria.
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Harabari, Andrea Prendalia. "Proveniência das rochas do Grupo Península Trinity, Antártica, como ferramenta para reconstrução da margem Pacífica do Gondwana." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/44/44143/tde-02032015-103728/.

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As rochas do Grupo Península Trinity e das unidadesequivalentes abrangem arenito, argilito e conglomerado, além de seus correspondentes metamórficos, e cuja formação é atribuída a correntes de turbidez. Afloram na parte norte da Península Antártica e arquipélagos adjacentes. Amostras de arenito, arcósio e conglomerado dessas unidades foram analisadas com intuito de traçar sua proveniência. A partir da análise petrográfica de arenito foi constatada a similaridade entre as rochas das formações do Grupo Península Trinity, Formação Grauvaca-Folhelho e Formação Miers Bluff. As rochas apresentam composição quartzo-feldspática, com baixa porcentagem de fragmentos líticos de composição plutônica, vulcânica e metamórfica. Diferenças composicionais ocorrem na Formação View Point, na qual também ocorre subarcóseo; e na Formação Miers Bluff, arcóseo lítico. As idades U-Pb de grãos detríticos de zircão para as rochas do Grupo Península Trinity da região de Botany Bay são concordantes e a mais jovem é 324 ± 8 Ma, ainda com quantidade expressiva de grãos com idades de 512 a 541Ma e 1001 a 1091Ma. Valores de ?Nd para rocha total, calculados para 220 Ma estão entre -5 e -8, indicando influência de fontes crustais recicladas ou de razoável residência crustal. A extensa gama de idades para a área-fonte indica reciclagem sedimentar de fonte diversa, com idades carboníferas, cambrianas e pré-cambrianas. O ?Hf calculado para as idades de U-Pb dos grãos de zircão detríticos mais jovens variade -1,2 a -5,7, também indicam extensa residência crustal. A amostra da Formação Legoupil, que complementa os dados de idades U-Pb em grãos detríticos de zircão para oGrupo Península Trinity, apresenta idade mais jovem de 265 ± 2, restringindo a idade máxima de sedimentação ao Permiano. Para as amostras da Formação Grauvaca-Folhelho as idades U-Pb em grãos detríticos de zircão apresentam duas concentrações bem definidas, permo-triássica e cambriana, com idade concordante mais jovem de 216 ± 2 Ma e mais antiga de 1,8 ± 0,13 Ga. Essas idades são condizentes com as dos grãos detríticos de zircão do Grupo Península Trinity. A partir dos dados de idades de grãos detríticos dezircão pode-se definir como a idade máxima para deposição para as formações Legoupil e Grauvaca-Folhelho sendo permo-triássica, assim como para as rochas do GrupoPenínsula Trinity em Botany Bay. Idades essas que levam a sugerir como fonte a Patagônia, no maciço Norte-patagônico, e Antártica Ocidental, na Terra de Mary Byrd. Estascondizem tanto em idade como em tipo de fonte, ígnea e metamórfica, com contribuição sedimentar.
The rocks of the Trinity Peninsula Group and equivalent units comprise sandstone, mudstone and conglomerate, as wel as their corresponding metamorphic rocks, whose formation is attributed to turbidity currents. They crop out in the northern Antarctic Peninsula and adjacent islands. Samples of sandstone, arkose and conglomerate of these units were analyzed in order to trace their provenance. From the petrographic analysis of sandstone was found similarity between the rocks of the Trinity Peninsula Group, Greywacke-Shale Formation and Miers Bluff Formation. The rocks have quartz-feldspathic composition, low percentage of lithic fragments of plutonic, volcanic and metamorphic rocks. Compositional differences occur in View Point Formation, which also occurs subarkose, and Miers Bluff Formation, lithic arcóseo. The U-Pb ages dates of detrital zircon grains in the rocks of the Trinity Peninsula Group region of Botany Bay are concordant and the youngest is 324 ± 8 Ma, but concentrations around 512-541Ma and 1001-1091Ma are common. Values of ?Nd calculated for 220 Ma are between -5 and -8, indicating influence of recycled crustal sources or with reasonable crustal residence. With extensive range of ages for the source area, indicating sediment recycling of diverse source areas, with ages spread from Carboniferous to Cambrian and Precambrian. The ?Hf calculated for dates U-Pb of younger detrital zircon ranges from -1.2 to -5.7, also indicate extensive crustal residence. The sample of Legoupil Formation, which complements the U-Pb dates for detrital zircon grains of the Trinity Peninsula Group, presents younger date of 265 ± 2, restricting the maximum age of the sedimentation asPermian. For samples of Greywacke-Shale Formation the U-Pb dates for detrital zircon grains exhibit two well-defined concentrations, permo-triassic and cambrian, with younger concordant date of 216 ± 2 Ma and older of 1.8 ± 0,13 Ga. These dates are consistent with those of detrital zircon grains from the Peninsula Group Trinity. From the data on detrital zircon grains can be defined as the maximum age for deposition for Legoupil and Greywacke-Shale formations being permo-triassic, as well as the rocks of the Trinity Peninsula Group in Botany Bay. Dates that suggest as a source area Patagonia, in Northern Patagonian massif and West Antarctica, in the Mary Byrd Land. These areas are consistent with both in age and rock types, igneous, metamorphic, and sedimentary, as the source area.
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Osborn, Stephen. "Elemental and Isotope Geochemistry of Appalachian Fluids: Constraints on Basin-Scale Brine Migration, Water-Rock Reactions, Microbial Processes, and Natural Gas Generation." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/194250.

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This study utilizes new geochemical analyses of fluids (formation water and gas) collected predominately from Devonian organic-rich shales and reservoir sandstones from the northern Appalachian Basin margin to investigate basin scale hydrologic processes, water-rock reactions, microbial activity, and natural gas generation. Elemental and isotopic composition of co-produced formation waters and natural gas show that the majority of methane in Devonian organic-rich shales and reservoir sandstones is thermogenic in origin with localized accumulations of microbial gas. Microbial methanogenesis appears to be primarily limited by redox buffered conditions favoring microbial sulfate reduction. Thermal maturity (bioavailability) of shale organic matter and the paucity of formation waters may also explain the lack of extensive microbial methane accumulations. Iodine and strontium isotopes, coupled to elemental chemistry demonstrate basin scale fluid flow and clay mineral diagenesis. Evidence for this is based on anomalously high ¹²⁹I/I values sourced from uranium deposits (fissiogenic production of ¹²⁹I) at the structural front of the Appalachian Basin. Radiogenic ⁸⁷Sr/⁸⁶Sr (up to 0.7220), and depleted boron and potassium concentrations support smectite clay diagenesis at temperatures greater than 120 °C. The development of fissiogenic ¹²⁹I as a tracer of basin scale fluid flow is a novel application of iodine isotopes provided that the sources of cosmogenic and anthropogenic ¹²⁹I are reasonably well constrained. The anomalously high ¹²⁹I/I in Appalachian Basin brines may be alternatively explained by microbial fractionation based on a correlation with decreasing δ¹³C-DIC values and decreasing sulfate concentrations in the range of sulfate reduction. These results demonstrate that the microbial fractionation of iodine isotopes may be possible and an important consideration when interpreting ¹²⁹I/I, regardless of the source of ¹²⁹I. Results from this study have important implications for understanding the controls on and origins of natural gas production in sedimentary basins; tectonically and topographically driven basin scale fluid flow, including diagenetically induced waterrock reactions and mineral ore deposition related to orogenesis; and an improvement of the use of iodine isotopes for understanding large scale fluid flow, and possibly its use as a tracer of organic matter diagenesis and the distribution of radionuclides in the environment.
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Gemeiner, Hendryk. "Isotopic and elemental determination of lead in particulate matter in the cities of Goiânia (GO) and Rio Claro (SP) using ICP-MS technique /." Rio Claro, 2016. http://hdl.handle.net/11449/144622.

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Orientador: Amauri Antonio Menegário
Banca: Verdiana Teixeira de Souza Martins
Banca: Juliana Aparecida Galhardi
Resumo: O metal tóxico de chumbo (Pb) pode ser prejudicial para a saúde humana em várias maneiras, mas também pode ser utilizado como um traçador da poluição ambiental, porque a abundância relativa dos seus quatro isótopos estáveis de massas 204, 206, 207 e 208 conhecidos varia de acordo com a fonte de emissão. Este estudo é focado nas concentrações de chumbo e nas razões isótopicas de material particulado das cidades brasileiras de Rio Claro (SP) e Goiânia (GO), a fim de determinar as principais fontes de poluição por Pb. Amostras de material particulado foram recolhidas em filtros de teflon limpos, durante a estações chuvosa e seca entre anos de 2014 e 2016 na UNESP - Campus de Rio Claro e no centro de Goiânia nas proximidades das estradas principais com um grande volume de tráfego. As concentrações de Pb e as razões isótopicas estáveis de 206Pb/207Pb e 208Pb/207Pb das amostras de material particulado foram analisadas por ICP-MS. Para aplicar esta técnica, foi necessário otimizar os parâmetros como o tempo de aquisição, tempo morto de detector e discriminação de massa, que afetam a exatidão da medida e precisão. Em Goiânia, as concentracões de Pb exibiram valores mais elevados na estação seca do que na estação chuvosa, enquanto as concentracões de Pb foram similares em ambas as campanhas de amostragem em Rio Claro. Trajetórias de volta do modelo HYSPLIT foram analisadas, a fim de investigarse associações entre os níveis de Pb e as direções das massas de ar. Entretanto, a comparação entre os valores das razões isótopicas 206Pb/207Pb e 208Pb/207Pb e os dados das fontes potenciais de Pb a partir de estudos prévios indicaram que a gasolina pode ser considerada como a principal fonte de Pb para o material particulado em Goiânia e Rio Claro. As razões... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The toxic metal lead (Pb) can be harmful to human health in various manners, but is also considered as a distinguished tracer of environmental pollution, since the relative abundance of its four stable isotopes with the atomic masses of 204, 206, 207 and 208 varies with the emission source. This study is focused on the lead concentrations and isotope ratios in the particulate matter of the Brazilian cities of Goiânia (GO) and Rio Claro (SP), in order to determine the main Pb pollution sources. Particulate matter samples were collected on clean Teflon filters during the rainy and dry season between 2014 and 2016 on the campus of the State University of São Paulo (UNESP) in Rio Claro city and in the centre of Goiânia city near main roads with a high traffic volume. The Pb concentrations as well as the 206Pb/207Pb and 208Pb/207Pb stable isotope ratios of the particulate matter samples were analysed by Inductively-Coupled Plasma Mass Spectrometry. To apply this analytical technique successfully, it was necessary to optimize parameters in case of acquisition time, detector dead time and mass discrimination, which affect the measurement accuracy and precision. Results showed that lead concentrations in Goiânia were different between rainy and dry season. In Goiânia, Pb concentrations showed higher values in dry season than in rainy season, while Pb concentrations were more similar in both sampling periods in Rio Claro. Back trajectories were analysed with the HYSPLIT model to investigate associations between Pb concentration levels and the direction of incoming air masses. However, the comparison of the obtained 206Pb/207Pb and 208Pb/207Pb isotope ratios data with data of potential Pb sources from previous studies indicated that gasoline may be considered as main Pb sources in the particulate matter of Goiânia and Rio Claro. Pb... (Complete abstract electronic acess below)
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Books on the topic "Elemental geochemistry"

1

M, Pieters Carlé, and Englert Peter A. J, eds. Remote geochemical analysis: Elemental and mineralogical composition. Cambridge, England: Press Syndicate of University of Cambridge, 1993.

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Reuer, Matthew K. Centennial-scale elemental and isotopic variability in the tropical and subtropical North Atlantic Ocean. Cambridge, Mass: Massachusetts Institute of Technology, 2002.

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Reuer, Matthew K. Centennial-scale elemental and isotopic variability in the tropical and subtropical North Atlantic Ocean. Cambridge, Mass: Massachusetts Institute of Technology, 2002.

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Iain, Thornton, Doyle Hazel, and Moir Anne C, eds. Geochemistry and health. Northwood [England]: Science Reviews, 1988.

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S, Grew E., ed. Beryllium: Mineralogy, petrology, and geochemistry. Washington, DC: Mineralogical Society of America, 2002.

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S, Grew E., and Anovitz Lawrence Michael, eds. Boron: Mineralogy, petrology, and geochemistry. Washington, D.C: Mineralogical Society of America, 1996.

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Leon, Diego Alejandro De, and Paloma Raquel Aragon. Trace elements: Environmental sources, geochemistry, and human health. Hauppauge, N.Y: Nova Science Publishers, 2011.

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Gavrilenko, V. V. Osnovy geokhimii redkikh litofilʹnykh metallov: Uchebnoe posobie. Leningrad: Izd-vo Leningradskogo universiteta, 1986.

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Institut geologii i geofiziki (Akademii︠a︡ nauk SSSR), ed. Mikroėlementnyĭ sostav osadochnykh tolshch, kak pokazatelʹ usloviĭ ikh formirovanii︠a︡: Sbornik nauchnykh trudov. Novosibirsk: Akademii︠a︡ nauk SSSR, Sibirskoe otd-nie, In-t geologii i geofiziki, 1989.

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1957-, Ni Shijun, ed. Di qiu hua xue ji xian de li lun yu shi jian. Beijing Shi: Hua xue gong ye chu ban she, 2007.

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Book chapters on the topic "Elemental geochemistry"

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Craigie, Neil. "Geochemistry and Mineralogy." In Principles of Elemental Chemostratigraphy, 39–83. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-71216-1_3.

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Schwarcz, Henry P. "Archaeological and Anthropological Applications of Isotopic and Elemental Geochemistry." In Frontiers in Geochemistry, 238–53. Chichester, UK: John Wiley & Sons, Ltd, 2011. http://dx.doi.org/10.1002/9781444329957.ch12.

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Stock, Leon M., and Ryszard Wolny. "Elemental Sulfur in Bituminous Coals." In Geochemistry of Sulfur in Fossil Fuels, 241–48. Washington, DC: American Chemical Society, 1990. http://dx.doi.org/10.1021/bk-1990-0429.ch014.

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Parveen, Uzma, and S. Sreekesh. "Elemental Geochemistry of Subsurface Sediments of Lower Baitarani Basin, East Coast of India: Implications for Paleoredox Condition." In Petrogenesis and Exploration of the Earth’s Interior, 145–47. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-01575-6_35.

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Zou, Hao, Shou-Ting Zhang, Min Li, and Zhan-Zhang Xu. "Element Geochemistry." In Modern Approaches in Solid Earth Sciences, 101–19. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7562-1_5.

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Verma, Surendra P. "Major Element Geochemistry." In Road from Geochemistry to Geochemometrics, 159–200. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9278-8_2.

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Verma, Surendra P. "Trace Element Geochemistry." In Road from Geochemistry to Geochemometrics, 201–25. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9278-8_3.

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Chester, Roy. "Trace elements in the oceans." In Marine Geochemistry, 346–421. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-010-9488-7_11.

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Darrah, Thomas H., M. Ellen Campbell, Jennifer J. Prustman-Pfeiffer, Robert J. Poreda, and Robyn E. Hannigan. "Trace Element Composition of Modern Human Bone." In Medical Geochemistry, 167–91. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-4372-4_10.

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Hoefs, Jochen. "Isotope Fractionation Mechanisms of Selected Elements." In Stable Isotope Geochemistry, 31–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05406-2_2.

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Conference papers on the topic "Elemental geochemistry"

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Panova, E., G. Oleynikova, E. Chi Fru, B. Allard, and Y. Fadin. "Nano-elemental Geochemistry of Black Shales." In Fifth EAGE Shale Workshop. Netherlands: EAGE Publications BV, 2016. http://dx.doi.org/10.3997/2214-4609.201600407.

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Fang, X., L. Wu, D. Lin, Y. Zhang, and S. Liu. "The Effect of Elemental Sulfur on the Thermal Evolution of Steroids." In 30th International Meeting on Organic Geochemistry (IMOG 2021). European Association of Geoscientists & Engineers, 2021. http://dx.doi.org/10.3997/2214-4609.202134014.

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Lipp, Alex, Charles Gowing, Gareth Roberts, Alexander Whittaker, and Victoria Fernandes. "Unmixing river sediments for the elemental geochemistry of their source-regions." In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.7177.

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Napier, T., L. Wörmer, J. Wendt, A. Lückge, and K. Hinrichs. "PAIRED SUB-ANNUAL BIOMARKER AND ELEMENTAL CLIMATE PROXIES REVEAL MONTHS OF CLIMATE SIGNAL INTEGRATION IN THE ARABIAN SEA." In 30th International Meeting on Organic Geochemistry (IMOG 2021). European Association of Geoscientists & Engineers, 2021. http://dx.doi.org/10.3997/2214-4609.202134135.

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Li, Yong. "Elemental geochemistry and paleoenvironment reconstruction of Upper Paleozoic in northeastern Ordos Basin, China." In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.4982.

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Hodelka, Bailee, Michael McGlue, Susan H. Zimmerman, and Irene Tunno. "PRELIMINARY INSIGHTS ON LATE QUATERNARY PALEOPRODUCTIVITY IN MONO LAKE, (CA) FROM ELEMENTAL AND STABLE ISOTOPE GEOCHEMISTRY." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-307774.

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Zhang, Wenxiang, Zhengtao Shi, Hucai Zhang, Qingzhong Ming, Fengqin Chang, Guoliang Lei, Guangjie Chen, and Ming Dong. "Elemental geochemistry and paleoenvironment evolution of Shell Bar section at Qarhan in the Qaidam Basin, China." In IGARSS 2011 - 2011 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2011. http://dx.doi.org/10.1109/igarss.2011.6049610.

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Rowe, Harry, Robert Loucks, and Charles Kerans. "Core Chemostratigraphy and Elemental Geochemistry along a Dip-Section, Pearsall Formation, Lower Cretaceous, Central to South TX." In Unconventional Resources Technology Conference. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/178625-ms.

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Rowe, Harry, Robert Loucks, and Charles Kerans. "Core Chemostratigraphy and Elemental Geochemistry Along a Dip-Section, Pearsall Formation, Lower Cretaceous, Central to South Texas." In Unconventional Resources Technology Conference. Tulsa, OK, USA: American Association of Petroleum Geologists, 2015. http://dx.doi.org/10.15530/urtec-2015-2154897.

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Sultana, Rakiba, Heather Owen, Charles Paradis, and Raymond Johnson. "MICROSCALE VISUALIZATION AND ELEMENTAL ANALYSIS OF SOLID-PHASE URANIUM GEOCHEMISTRY ON CONTAMINATED SEDIMENTS USING FISSION TRACK TECHNOLOGY." In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-379607.

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Reports on the topic "Elemental geochemistry"

1

Jacques, I. J., A. J. Anderson, and S. G. Nielsen. The geochemistry of thallium and its isotopes in rare-element pegmatites. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328983.

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The Tl isotopic and trace element composition of K-feldspar, mica, pollucite and pyrite from 13 niobium-yttrium-fluorine (NYF)-type and 14 lithium-cesium-tantalum (LCT)-type rare-element pegmatites was investigated. In general, the epsilon-205Tl values for K-feldspar in NYF- and LCT-type pegmatites increases with increasing magmatic fractionation. Both NYF and LCT pegmatites display a wide range in epsilon-205Tl (-4.25 to 9.41), which complicates attempts to characterize source reservoirs. We suggest 205Tl-enrichment during pegmatite crystallization occurs as Tl partitions between the residual melt and a coexisting aqueous fluid or flux-rich silicate liquid. Preferential association of 205Tl with Cl in the immiscible aqueous fluid may influence the isotopic character of the growing pegmatite minerals. Subsolidus alteration of K-feldspar by aqueous fluids, as indicated by the redistribution of Cs in K-feldspar, resulted in epsilon-205Tl values below the crustal average (-2.0 epsilon-205Tl). Such low epsilon-205Tl values in K-feldspar is attributed to preferential removal and transport of 205Tl by Cl-bearing fluids during dissolution and reprecipitation. The combination of thallium isotope and trace element data may be used to examine late-stage processes related to rare-element mineralization in some pegmatites. High epsilon-205Tl and Ga in late-stage muscovite appears to be a favorable indicator of rare-element enrichment LCT pegmatites and may be a useful exploration vector.
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Plouffe, A., and S. P. Williams. Regional till geochemistry, gold and pathfinder elements, northern Nechako River, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1998. http://dx.doi.org/10.4095/210023.

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Anglin, C. D. Rare Earth and Trace Element Geochemistry of Scheelites, Slave Province Gold Deposits. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1992. http://dx.doi.org/10.4095/133348.

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Piercey, S. J., and J. L. Pilote. Nd-Hf isotope geochemistry and lithogeochemistry of the Rambler Rhyolite, Ming VMS deposit, Baie Verte Peninsula, Newfoundland: evidence for slab melting and implications for VMS localization. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328988.

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New high precision lithogeochemistry and Nd and Hf isotopic data were collected on felsic rocks of the Rambler Rhyolite formation from the Ming volcanogenic massive sulphide (VMS) deposit, Baie Verte Peninsula, Newfoundland. The Rambler Rhyolite formation consists of intermediate to felsic volcanic and volcaniclastic rocks with U-shaped primitive mantle normalized trace element patterns with negative Nb anomalies, light rare earth element-enrichment (high La/Sm), and distinctively positive Zr and Hf anomalies relative to surrounding middle rare earth elements (high Zr-Hf/Sm). The Rambler Rhyolite samples have epsilon-Ndt = -2.5 to -1.1 and epsilon-Hft = +3.6 to +6.6; depleted mantle model ages are TDM(Nd) = 1.3-1.5 Ga and TDM(Hf) = 0.9-1.1Ga. The decoupling of the Nd and Hf isotopic data is reflected in epsilon-Hft isotopic data that lies above the mantle array in epsilon-Ndt -epsilon-Hft space with positive ?epsilon-Hft values (+2.3 to +6.2). These Hf-Nd isotopic attributes, and high Zr-Hf/Sm and U-shaped trace element patterns, are consistent with these rocks having formed as slab melts, consistent with previous studies. The association of these slab melt rocks with Au-bearing VMS mineralization, and their FI-FII trace element signatures that are similar to rhyolites in Au-rich VMS deposits in other belts (e.g., Abitibi), suggests that assuming that FI-FII felsic rocks are less prospective is invalid and highlights the importance of having an integrated, full understanding of the tectono-magmatic history of a given belt before assigning whether or not it is prospective for VMS mineralization.
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West, H. B., G. A. Delanoy, D. M. Thomas, D. C. Gerlach, B. Chen, P. Takahashi, and D. M. Thomas. Trace element and isotope geochemistry of geothermal fluids, East Rift Zone, Kilauea, Hawaii. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/5179426.

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Jonasson, I. R., E M Hillary, M. D. Hannington, P. Mercier-Langevin, and D. Diekrup. Trace-element geochemistry of ore-mineral separates from selected Canadian base-metal deposits. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2020. http://dx.doi.org/10.4095/326134.

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David, J., and C. Gariepy. Rare - Earth Element Geochemistry of Sedimentary Sequences From the Lower St - Lawrence, Quebec Appalachians. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1987. http://dx.doi.org/10.4095/122482.

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Dredge, L. A., B. C. Ward, and D. E. Kerr. Trace element geochemistry and gold grain results from till samples, Point Lake, Northwest Territories (86H). Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1996. http://dx.doi.org/10.4095/208289.

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Tarney, J., and N. G. Marsh. Major and Trace Element Geochemistry of Holes Cy - 1 and Cy - 4: Implications For Petrogenetic Models. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1992. http://dx.doi.org/10.4095/133537.

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King, R. D., S. J. Piercey, R. C. Paulen, and J. A. Petrus. Major-, minor-, and trace-element geochemistry of sulphide indicator minerals from surficial sediments, southwestern Northwest Territories. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2019. http://dx.doi.org/10.4095/314688.

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