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Relevant bibliographies by topics / Stable Isotope Geochemistry

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Academic literature on the topic 'Stable Isotope Geochemistry'

Author: Grafiati

Published: 4 June 2021

Last updated: 20 February 2023

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Journal articles on the topic "Stable Isotope Geochemistry"

1

Hattori, Keiko. "Stable isotope geochemistry." Sedimentary Geology 114, no. 1-4 (1997): 321–22. http://dx.doi.org/10.1016/s0037-0738(97)00056-0.

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Farquhar, James. "Stable isotope geochemistry,." Geochimica et Cosmochimica Acta 67, no. 8 (2003): 1597–98. http://dx.doi.org/10.1016/s0016-7037(02)01230-9.

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Ogbesejana, Abiodun Busuyi, Bo Liu, and Mehdi Ostadhassan. "Stable Isotope Geochemistry of the Organic Elements within Shales and Crude Oils: A Comprehensive Review." Molecules 27, no. 1 (2021): 34. http://dx.doi.org/10.3390/molecules27010034.

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Over time, stable isotopes have proven to be a useful tool in petroleum geochemistry. However, there is currently insufficient literature on stable isotope geochemistry of the organic elements within shales and crude oils in many petroleum systems around the world. As a result, this paper critically reviews the early and recent trends in stable isotope geochemistry of organic elements in shales and crude oils. The bulk and compound-specific stable isotopes of H, C, and S, as well as their uses as source facies, depositional environments, thermal maturity, geological age, and oil–oil and oil–source rock correlation studies, are all taken into account. The applications of the stable isotopes of H and C in gas exploration are also discussed. Then, the experimental and instrumental approaches to the stable isotopes of H, C, and S, are discussed.

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Pollard, A. M. "Isotopes and impact: a cautionary tale." Antiquity 85, no. 328 (2011): 631–38. http://dx.doi.org/10.1017/s0003598x00068034.

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There can be no doubt that isotopic studies have made a huge contribution to archaeology in recent years, so much so that isotope archaeology is now seen as an essential subdiscipline of archaeology in much the same way as isotope geochemistry is a key subdiscipline of geochemistry. Ignoring for current purposes the contribution made by the measurement of a particular radioactive isotope of carbon (14C) since 1950, we can date the beginnings of isotope archaeology to the mid 1960s with the first measurements of lead isotopes in archaeological metals and slags by Brill and Wampler (1965, 1967). This was followed by carbon stable isotopes in human bone collagen in the late 1970s, building on previous work measuring σ13C in archaeological bone for radiocarbon determinations (Vogel & Van der Merwe 1977; Van der Merwe & Vogel 1978). Other isotopes followed rapidly, such as nitrogen, oxygen, sulphur and hydrogen for archaeological, palaeoecological or palaeoclimatological purposes and, more recently, the heavier radiogenic isotopes of strontium and neodymium for determining the provenance of organic and inorganic materials (Pollard & Heron 2008).

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Apolinarska, Karina. "Book reviews: Stable isotope geochemistry." Geologos 22, no. 1 (2016): 79–80. http://dx.doi.org/10.1515/logos-2016-0007.

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Corfield, Richard M., and Richard D. Norris. "Isotope Paleobiology and Paleoecology: So Why Should Paleontologists Care About Geochemistry?" Paleontological Society Papers 4 (October 1998): 1–6. http://dx.doi.org/10.1017/s1089332600000371.

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Stable isotopic techniques in geology illuminate not only variations in past climates and oceans, but also the life-histories of extinct animals, plants and protistans. This volume focuses on the ways that stable isotopes can be used as tracers of the fossil biology and ecology of long-dead organisms and ecosystems. Here, we introduce relevant aspects of stable isotope systematics and provide a summary of the papers collected in this volume. The nine contributions collected here, from some of the most eminent workers in their respective fields, explore aspects of the ecology, evolution and biology of organisms from planktonic foraminifera to dinosaurs.

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Sheppard, S. M. F., and H. A. Gilg. "Stable isotope geochemistry of clay minerals." Clay Minerals 31, no. 1 (1996): 1–24. http://dx.doi.org/10.1180/claymin.1996.031.1.01.

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AbstractThe equilibrium H- and O-isotope fractionations can be approximated by the following equations which are based on experimental, empirical and/or theoretical data:Hydrogen: 1000 ln αkaolinite-water = −2.2 × 106 × T−2 − 7.7Oxygen: 1000 ln αkaolinite-water = 2.76 × 106 × T−2 − 6.751000 ln αsmectite-water = 2.55 × 106 × T−2 − 4.051000 ln αillite-water = 2.39 × 106 × T−2 − 3.76The equilibrium H-isotope fractionation factors vs. 106 × T−2 for kaolinite and probably smectite and illite are monotonic curves between 350-0°C. More complex curves, with a minimum fractionation near 200°C, are probably influenced by surface effects and/or disequilibrium fractionations among the different hydrogen sites. The H-isotope fractionations between smectite-water increase by ~70‰ from Fe-poor montmorillonite to nontronite at low temperatures. The pore-interlayer water in smectite H-isotope fractionation at low temperatures is ~20±10‰. The presence of organic matter can modify both the δD value of the clay analysis and its ‘water’ content. Clays — kaolinite, illite, smectite and probably halloysite — tend to retain their D/H and 18O/16O ratios unless subjected to more extreme diagenetic or metamorphic conditions or special local processes. Kinetic information is still only qualitative: for comparable grain sizes, hydrogen exchanges more rapidly than oxygen in the absence of recrystallization. Low-temperature diffusion coefficients cannot be calculated with sufficient precision from the higher temperature exchange data. The H- and O-isotope studies of clays can provide useful information about their conditions of formation.

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Vasil’chuk, Yurij, and Julian Murton. "STABLE ISOTOPE GEOCHEMISTRY OF MASSIVE ICE." GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY 9, no. 3 (2016): 4–24. http://dx.doi.org/10.15356/2071-9388_03v09_2016_01.

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Kendall, Brian, Tais W. Dahl, and Ariel D. Anbar. "THE STABLE ISOTOPE GEOCHEMISTRY OF MOLYBDENUM." Reviews in Mineralogy and Geochemistry 82, no. 1 (2017): 683–732. http://dx.doi.org/10.2138/rmg.2017.82.16.

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Wang, Chong Jing, He Zhang, Jian Ming Chen, and Wen Bin Chen. "Organic Carbon & Nitrogen Stable Isotope Geochemistry of Anthraxolite from Different Fractures in Xiangxi, China." Applied Mechanics and Materials 733 (February 2015): 136–39. http://dx.doi.org/10.4028/www.scientific.net/amm.733.136.

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In order to analyze the stable organic carbon isotope characteristics and the causes of anthrax lite, 14 samples, containing hydrocarbon source rock, rock and anthrax lite, were selected to test the stable organic carbon and organic nitrogen isotope. Results showed that the relations of stable organic carbon isotope between source rock and anthrax lite were that δ13C source rock <δ13Csmall fault<δ13Clarge fault. Maybe the Early Cambrian anoxic events leaded the hydrocarbon source rock δ13C value low, and different metallogenic evolution and the isotopic fractionation process may be the cause of stable organic carbon isotope value differences between anthrax lite in large and small fault.

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Dissertations / Theses on the topic "Stable Isotope Geochemistry"

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Wombacher, Frank. "The stable isotope geochemistry and cosmochemistry of cadmium." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=967287685.

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Thomas, Katherine S. S. M. Massachusetts Institute of Technology. "Organic geochemistry and stable isotope constraints on Precambrian biogeochemical processes." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/69474.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 91-101).<br>Details of the biogeochemical cycles and the dominant mechanisms present in Precambrian remain heavily debated topics. The events of the Late Proterozoic onset to glaciations and what types of early life existed in the Archean are two of the many provoking topics within the Precambrian. We set out to improve the understanding of these geologic intervals by examining stable isotopic signatures and molecular fossils (biomarkers) in Late Proterozoic and Mesoarchean ages sedimentary rocks in Northwestern Territories, Canada and Pilbara, Western Australia, respectively. This thesis presents sulfur, carbon, oxygen and nitrogen stable isotopic data along with distribution of steranes and hopanes biomarkers. Geochemical data is analyzed in the context of elucidating the key biological and environmental factors involved in the Mesoarchean marine biosphere and the Late Proterozoic onset of glaciations. Stable isotopic analysis of the Gorge Creek Group in Pilbara, Western Australia reveals organisms capable of microbial sulfur disproportionation were likely the dominant biological players in Mesoarchean deep-ocean sulfur cycling. Biomarker and isotopic proxies of the Coppercap Formation reveal diverse biological activity directly prior to the Sturtian Glaciation with communities of green and purple sulfur bacteria as well as methanotrophs and cyanobacteria. Possible environmental implications of these communities co-existing are explained in context of changes in ocean chemistry and the diversification of eukaryotic life.<br>by Katherine S. Thomas.<br>S.M.

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Morisset, Natalie Carleton University Dissertation Geology. "Stableisotope and radioisotope geochemistry of the Panda Hill carbonatite, Tanzania." Ottawa, 1992.

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Khademi-Moghari, Hossein. "Stable isotope geochemistry, mineralogy, and microscopy of gypsiferous soils from central Iran." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq23945.pdf.

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Dong, Shuofei. "Stable (Cu, Zn) and radiogenic (Pb) isotope geochemistry of airborne particulate matter." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/10746.

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The aim of the thesis was to test the isotope systematics of Cu, Zn and Pb in atmospheric particulate matter and potential source material in order to critically discuss its implications and applications to studies of global biogeochemical cycles and anthropogenic impact. Four specific objectives were addressed: First, we tailored existing analytical methods to enable for the first time accurate and precise Cu and Zn isotope ratio measurements in dust and aerosol samples with low element content. Second, we studied the Pb, Cu and Zn isotope composition in aerosols collected in London to test their potential to trace anthropogenic sources in the urban atmosphere. Third, we characterized the Cu and Zn isotope systematics of major Asian and African dust sources and constrained possible controls and implications on the marine isotope signature. Finally, we investigated the isotope fractionation of Zn during dissolution experiments with acidic solution of natural dust to test the possible effect of atmospheric processing on the isotope signature of deposited Zn. The conclusions from this work are: First, stable isotopes confirm that brake and tyre emissions are the likely dominant sources of Zn and Cu in urban aerosols and that recycled Pb deposited originally from leaded gasoline still contributes significantly to the burden of atmospheric Pb in London. Second, we show that the Cu and Zn isotope signatures vary significantly between the major Asian and African dust sources and we find a significant correlation between Cu isotope ratio and illite content. Mass balance calculation suggest that bulk samples record faithfully the isotope signature of the <4 μm fraction. Third, significant isotope fractionation of Zn is observed during dust dissolution suggesting that the isotope signature of Zn deposited in the surface ocean is not only controlled by source mixing but also by atmospheric processing during long range transportation. The work clearly supports the initial hypothesis that metal isotopes are powerful sources to study global and regional biogeochemical cycles.

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Faure, Kevin. "A stable isotope study of the Kaap Valley Tonalite, Barberton Mountain Land, South Africa." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/15849.

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Bibliography: pages 100-109.<br>The Kaap Valley Tonalite (KVT) was a homogenous hornblende+ biotite tonalite that had been subjected to overail propylitic and potassic alteration. Petrographic studies reveal that carbonate alteration and increased proportions of hydrous minerals occur along the KVT and Barberton greenstone belt contact zone, and along major shear zones within the KVT.

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Peel, Kate Elizabeth. "Studies into the Stable Isotope Geochemistry of Copper and Zinc in Aquatic Systems." Thesis, Imperial College London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.503795.

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Hopley, Philip J. "Palaeoenvironmental reconstruction of South African hominin-bearing cave deposits using stable isotope geochemistry." Thesis, University of Liverpool, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402265.

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Scott, Gillian Anne. "Contemporary ecology and stable isotope geochemistry of benthic foraminiferids in the Celtic Sea." Thesis, Bangor University, 1998. https://research.bangor.ac.uk/portal/en/theses/contemporary-ecology-and-stable-isotope-geochemistry-of-benthic-foraminiferids-in-the-celtic-sea(ed14ac68-ce51-4156-8420-773fee552fb7).html.

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The primary aim of this thesis was to assess the value of foraminifera in downcore studies of shelfsea stratification using both assemblage and geochemical characteristics. An examination of the modern distribution of foraminifera in the context of stratification in the Celtic Sea and comparison of these distributions with measured environmental variables was undertaken to this end. In addition, several species were examined for their stable oxygen and carbon isotopic composition with reference to the ambient bottom and porewaters. Cruises were run to the Celtic Sea in July, 1995 and July-August, 1996, during which hydrographic data, water and surface sediment samples were collected from 138 stations. Fifty-three samples were subsequently analysed for grainsize, geochernical and foraminiferal properties, while the water samples were analysed for oxygen isotopic composition. A total of six multicores were extracted and sectioned. Each section was analysed for porewater carbon isotopic composition and foraminiferal content. Selected foraminifera from both the surface and subsurface samples were analysed for the oxygen and carbon isotopic composition of their test calcite. Statistical analyses of the foraminiferal data indentifed four distinct assemblages which have potential for palaeostratification studies. The mixed-type assemblage included Cibicides lobatulus, Ammonia beccarfi, Quinqueloculina seminulum, Textularia bockii and Spiroplectammina, wrightfi. The stratifiedtype assemblages included Bulimina marginata, Hyalinea balthica, Nonionella turgida and Adercotryma glomeratum while Stainforthis fusiformis was diagnostic of the front. Bulimina gibba, Elphidium excavatum forma selseyensis and Eggerelloides scabrus defined an eastern asseblage. It is believed that the true controls on these assemblages are oxygen and food supply. Ammonia beccarii precipitated its test in oxygen isotopic equilibrium while Q. seminulum was consistently, negatively offset by approximately 0.5 O/oo. This demonstrates the potential of these species in palaeo-temperature and particularily, palaeo-stratifcation studies. The 'microhabitat effect' was examined for several species of foraminifera but was not observed.

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De, Baun Derik K. "Silica Replacement in the Southern White Pine Range, East Central Nevada| A Stable Isotope Study." Thesis, California State University, Long Beach, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10841608.

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<p> In the southern White Pine Range (SWPR) silica is found to have been deposited from hydrothermal solution within the Currant Gap Detachment fault (CGD). Silica has been observed to occur in three modes of deposition: (1) narrow veins within the lower plate Pole Canyon limestone, (2) bulk silicification of carbonates and (3) breccia matrix found in proximity to the CGD. </p><p> Through stable isotope analysis of oxygen from quartz samples and hydrogen from fluid inclusions we see that there is a history of meteoric waters penetrating into the Lower Pole Canyon Formation, in the lower plate of the CGD. This study reveals that silica in the SWPR formed from aqueous fluids at temperatures between 260 °C and 315 °C within lower plate quartz veins and 150 °C to 300 °C within the upper plate of the CGD. These temperature ranges are in line with what would be expected in a brittle regime (T < 350 °C).</p><p>

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Books on the topic "Stable Isotope Geochemistry"

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Stable isotope geochemistry. 5th ed. Springer, 2004.

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Stable isotope geochemistry. 3rd ed. Springer-Verlag, 1987.

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W, Valley John, Cole David R, and Mineralogical Society of America, eds. Stable isotope geochemistry. Mineralogical Society of America, 2001.

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Stable isotope geochemistry. 4th ed. Springer, 1997.

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Hoefs, Jochen. Stable Isotope Geochemistry. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77692-3.

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Hoefs, Jochen. Stable Isotope Geochemistry. Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05406-2.

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Hoefs, Jochen. Stable Isotope Geochemistry. Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-662-09998-8.

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Hoefs, Jochen. Stable Isotope Geochemistry. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78527-1.

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Hoefs, Jochen. Stable Isotope Geochemistry. Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-662-03377-7.

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Hoefs, Jochen. Stable Isotope Geochemistry. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19716-6.

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Book chapters on the topic "Stable Isotope Geochemistry"

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White, William M. "Stable Isotope Geochemistry." In Encyclopedia of Earth Sciences Series. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-39193-9_351-1.

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White, William M. "Stable Isotope Geochemistry." In Encyclopedia of Earth Sciences Series. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-39312-4_351.

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Hoefs, Jochen. "Variations of Stable Isotope Ratios in Nature." In Stable Isotope Geochemistry. Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05406-2_3.

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Hoefs, Jochen. "Variations of Stable Isotope Ratios in Nature." In Stable Isotope Geochemistry. Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-662-03377-7_3.

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McKeegan, Kevin D., and Laurie A. Leshin. "4. Stable Isotope Variations in Extraterrestrial Materials." In Stable Isotope Geochemistry, edited by John W. Valley and David R. Cole. De Gruyter, 2001. http://dx.doi.org/10.1515/9781501508745-007.

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Valley, John W. "6. Stable Isotope Thermometry at High Temperatures." In Stable Isotope Geochemistry, edited by John W. Valley and David R. Cole. De Gruyter, 2001. http://dx.doi.org/10.1515/9781501508745-009.

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Hoefs, Jochen. "Variations of Stable Isotope Ratios in Nature." In Stable Isotope Geochemistry. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19716-6_3.

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Hoefs, Jochen. "Theoretical and Experimental Principles." In Stable Isotope Geochemistry. Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05406-2_1.

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

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Hoefs, Jochen. "Theoretical and Experimental Principles." In Stable Isotope Geochemistry. Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-662-03377-7_1.

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Conference papers on the topic "Stable Isotope Geochemistry"

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Shahar, Anat. "AN EXPERIMENTAL PERSPECTIVE ON NON-TRADITIONAL STABLE ISOTOPE GEOCHEMISTRY." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-316957.

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Smith, Devin F., Elsa Saelens, Deborah Leselie, Marcus Liston, Sue A. Welch, and Anne E. Carey. "STABLE ISOTOPE AND MAJOR ION GEOCHEMISTRY OF URBAN PRECIPITATION." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-306089.

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Giunta, T., M. Ader, H. Eggenkamp, M. Bonifacie, and P. Agrinier. "Chlorine and Bromine Stable Isotope Compositions and Formation Water Characterisation." In EAGE Workshop on Petroleum Geochemistry in Operations and Production. EAGE Publications BV, 2016. http://dx.doi.org/10.3997/2214-4609.201602337.

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Mehay, S., N. Luu, C. Turich, et al. "Shelf Life Study of Calibration Stable Isotope Hydrocarbon Mixtures for Petroleum Geochemistry Laboratories." In 29th International Meeting on Organic Geochemistry. European Association of Geoscientists & Engineers, 2019. http://dx.doi.org/10.3997/2214-4609.201902911.

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Eggenkamp, H. G. M., P. Agrinier, M. L. Coleman, et al. "Halogen stable isotope studies in formation waters, a comparison between their chlorine and bromine isotope systematics." In Second EAGE Workshop on Geochemistry in Petroleum Operations and Production. EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201803087.

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Aldahik, A. "Trace Origin of Gas Leakage behind Casing Using Stable Isotope Geochemistry." In EAGE Workshop on Petroleum Geochemistry in Operations and Production. EAGE Publications BV, 2016. http://dx.doi.org/10.3997/2214-4609.201602333.

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Kaye, Michael. "STABLE ISOTOPE GEOCHEMISTRY AND HYDROLOGY OF THE LAKE JUNíN WATERSHED, PERU." In Joint 52nd Northeastern Annual Section and 51st North-Central Annual GSA Section Meeting - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017ne-291642.

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Rongde, Xu, Chen Jianfa, and Wan Yunyang. "The Component and Stable Carbon Isotope Analysis of Casing Gases on Low Permeability Reservoir Meor." In 29th International Meeting on Organic Geochemistry. European Association of Geoscientists & Engineers, 2019. http://dx.doi.org/10.3997/2214-4609.201902909.

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Barra, T. A., C. L. Torres, M. A. Dal Sasso, E. V. Santos Neto, and D. A. Azevedo. "Deconvolution of Petroleum Sources in Southeastern Offshore Brazilian Basins Using Stable Carbon Isotope Ratios of N-Alkanes." In 29th International Meeting on Organic Geochemistry. European Association of Geoscientists & Engineers, 2019. http://dx.doi.org/10.3997/2214-4609.201902912.

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Marshall, N., G. Love, A. Bekker, and V. Grytsenko. "TRACKING THE EVOLUTION OF THE SILURIAN MARINE BIOSPHERE USING LIPID BIOMARKERS AND STABLE ISOTOPE GEOCHEMISTRY." In 30th International Meeting on Organic Geochemistry (IMOG 2021). European Association of Geoscientists & Engineers, 2021. http://dx.doi.org/10.3997/2214-4609.202134188.

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Reports on the topic "Stable Isotope Geochemistry"

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Stolper, Edward. Infrared Spectroscopy and Stable Isotope Geochemistry of Hydrous Silicate Glasses. Office of Scientific and Technical Information (OSTI), 2007. http://dx.doi.org/10.2172/900289.

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Cesar, J. R., and O. H. Ardakani. Organic geochemistry of the Montney Formation: new insights about the source of hydrocarbons, their accumulation history and post accumulation processes. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/329788.

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This study consists of a non-traditional molecular and stable isotope approach to analyze organic matter (soluble bitumen and produced oil/condensate) from the Montney Formation low-permeability reservoirs, with the purpose of identifying source(s) of hydrocarbons, accumulation history and post accumulation processes. The same approach bases on the distribution of compound classes such as aromatic carotenoids, polycyclic aromatic hydrocarbons (PAHs), bicyclic alkanes, and oxygen-polar compounds. The geochemical screening has been enhanced with performing compound specific isotope analysis (CSIA) of n-alkanes and selected aromatic hydrocarbons. Widely spread PAHs, the presence of molecular indicators of euxinia, and hydrocarbon mixtures identified using CSIA profiles, are some of the key findings from this research, which will improve our understanding of the Montney petroleum system(s).

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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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Kidder, J. A., M. B. McClenaghan, M I Leybourne, et al. Geochemical data for stream and groundwaters around the Casino Cu-Au-Mo porphyry deposit, Yukon (NTS 115 J/10 and 115 J/15). Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/328862.

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This open file reports geochemical data for stream and groundwater samples collected around the Casino porphyry Cu-Au-Mo deposit, one of the largest and highest-grade deposits of its kind in Canada. The calc-alkaline porphyry is hosted in a Late Cretaceous quartz monzonite and associated breccias in the unglaciated region of west central Yukon. Water chemistry around the deposit was investigated because: (i) the deposit has not yet been disturbed by mining; (ii) the deposit was known to have metal-rich waters in local streams; and (iii) the deposit has atypically preserved ore zones. Stream water samples were collected at 22 sites and groundwater samples were collected from eight sites. Surface and groundwaters around the Casino deposit are anomalous with respect to Cd (up to 5.4 µg/L), Co (up to 64 µg/L), Cu (up to 1657 µg/L), Mo (up to 25 µg/L), As (up to 17 µg/L), Re (up to 0.7 µg/L), and Zn (up to 354 µg/L) concentrations. The stable isotopes of O and H of the groundwaters are essentially identical to the surface waters and plot close to the local and global meteoric water lines, indicating that the waters represent modern recharge, consistent with the generally low salinities of all the waters (total dissolved solids range from 98 to 1320 mg/L). Sulfur and Sr isotopes are consistent with proximal waters interacting with the Casino rocks and mineralization; a sulfide-rich bedrock sample from the deposit has delta-34S = -1.2 permille and proximal groundwaters are only slightly heavier (-0.3 to 3.1 permille). These geochemical and isotopic results indicate that surface water geochemistry is a suitable medium for mineral exploration for porphyry-style mineralization in the Yukon, and similar unglaciated regions in Canada. The atypical geochemical signature (Mo, Se, Re, As, Cu) of these types of deposits are typically reflected in the water chemistry and S isotopes provide a more local vectoring tool.

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