Selenium isotopes trace the source and redox processes in the black shale-hosted Se-rich deposits in China
We analyzed the Se isotopic composition of black shales and related kerogen and sulfide fractions from the Zunyi Ni–Mo–Se deposit, the La’erma Se–Au deposit and the Yutangba Se deposit in southern China to constrain metal sources and accumulation processes, both subjects of disagreement in the scien...
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| Published in | Geochimica et cosmochimica acta Vol. 75; no. 6; pp. 1411 - 1427 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Ltd
15.03.2011
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| Subjects | |
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| Abstract | We analyzed the Se isotopic composition of black shales and related kerogen and sulfide fractions from the Zunyi Ni–Mo–Se deposit, the La’erma Se–Au deposit and the Yutangba Se deposit in southern China to constrain metal sources and accumulation processes, both subjects of disagreement in the scientific community. Se at the Zunyi Ni–Mo–Se polymetallic deposit displayed a restricted range of δ
82Se values (−1.6‰ to 2.4‰ with a mean of 0.6‰) suggesting a major hydrothermal origin where aqueous Se was probably transported as H
2Se, along with H
2S, and precipitated directly as selenides or in sulfides. Se at the La’erma Se–Au deposit covers a larger range in δ
82Se values (−3.8‰ to 5.4‰ with a mean of 0.3‰), suggesting Se redistribution following redox transformations, leading to kinetic isotopic fractionation. The largest Se isotopic variation so far in natural terrestrial samples was found in the Yutangba Se deposit, with δ
82Se values varying from −12.77‰ to 4.93‰. On the basis of variations in Se isotopes in the deposit, along with other geological and geochemical evidence, the “redox model” (supergene alteration) explains the occurrence of native Se in the deposit. Overall, hydrothermal systems may be a potentially important Se source to form economic deposits in comparison to seawater sources. Significantly, our study indicates that either secondary hydrothermal or supergene alteration is a key factor in Se enrichment in black shales. Redistribution of Se, and probably other redox-sensitive metals like Mo, Cr and V, leads to isotopic fractionation which may be used to fingerprint such alteration/precipitation processes. |
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| AbstractList | We analyzed the Se isotopic composition of black shales and related kerogen and sulfide fractions from the Zunyi Ni–Mo–Se deposit, the La’erma Se–Au deposit and the Yutangba Se deposit in southern China to constrain metal sources and accumulation processes, both subjects of disagreement in the scientific community. Se at the Zunyi Ni–Mo–Se polymetallic deposit displayed a restricted range of δ⁸²Se values (−1.6‰ to 2.4‰ with a mean of 0.6‰) suggesting a major hydrothermal origin where aqueous Se was probably transported as H₂Se, along with H₂S, and precipitated directly as selenides or in sulfides. Se at the La’erma Se–Au deposit covers a larger range in δ⁸²Se values (−3.8‰ to 5.4‰ with a mean of 0.3‰), suggesting Se redistribution following redox transformations, leading to kinetic isotopic fractionation. The largest Se isotopic variation so far in natural terrestrial samples was found in the Yutangba Se deposit, with δ⁸²Se values varying from −12.77‰ to 4.93‰. On the basis of variations in Se isotopes in the deposit, along with other geological and geochemical evidence, the “redox model” (supergene alteration) explains the occurrence of native Se in the deposit. Overall, hydrothermal systems may be a potentially important Se source to form economic deposits in comparison to seawater sources. Significantly, our study indicates that either secondary hydrothermal or supergene alteration is a key factor in Se enrichment in black shales. Redistribution of Se, and probably other redox-sensitive metals like Mo, Cr and V, leads to isotopic fractionation which may be used to fingerprint such alteration/precipitation processes. We analyzed the Se isotopic composition of black shales and related kerogen and sulfide fractions from the Zunyi Ni-Mo-Se deposit, the La'erma Se-Au deposit and the Yutangba Se deposit in southern China to constrain metal sources and accumulation processes, both subjects of disagreement in the scientific community. Se at the Zunyi Ni-Mo-Se polymetallic deposit displayed a restricted range of [delta][super]82Se values (-1.6ppt to 2.4ppt with a mean of 0.6ppt) suggesting a major hydrothermal origin where aqueous Se was probably transported as H sub(2Se, along with H) sub(2)S, and precipitated directly as selenides or in sulfides. Se at the La'erma Se-Au deposit covers a larger range in [delta][super]82Se values (-3.8ppt to 5.4ppt with a mean of 0.3ppt), suggesting Se redistribution following redox transformations, leading to kinetic isotopic fractionation. The largest Se isotopic variation so far in natural terrestrial samples was found in the Yutangba Se deposit, with [delta][super]82Se values varying from -12.77ppt to 4.93ppt. On the basis of variations in Se isotopes in the deposit, along with other geological and geochemical evidence, the "redox model" (supergene alteration) explains the occurrence of native Se in the deposit. Overall, hydrothermal systems may be a potentially important Se source to form economic deposits in comparison to seawater sources. Significantly, our study indicates that either secondary hydrothermal or supergene alteration is a key factor in Se enrichment in black shales. Redistribution of Se, and probably other redox-sensitive metals like Mo, Cr and V, leads to isotopic fractionation which may be used to fingerprint such alteration/precipitation processes. We analyzed the Se isotopic composition of black shales and related kerogen and sulfide fractions from the Zunyi Ni–Mo–Se deposit, the La’erma Se–Au deposit and the Yutangba Se deposit in southern China to constrain metal sources and accumulation processes, both subjects of disagreement in the scientific community. Se at the Zunyi Ni–Mo–Se polymetallic deposit displayed a restricted range of δ 82Se values (−1.6‰ to 2.4‰ with a mean of 0.6‰) suggesting a major hydrothermal origin where aqueous Se was probably transported as H 2Se, along with H 2S, and precipitated directly as selenides or in sulfides. Se at the La’erma Se–Au deposit covers a larger range in δ 82Se values (−3.8‰ to 5.4‰ with a mean of 0.3‰), suggesting Se redistribution following redox transformations, leading to kinetic isotopic fractionation. The largest Se isotopic variation so far in natural terrestrial samples was found in the Yutangba Se deposit, with δ 82Se values varying from −12.77‰ to 4.93‰. On the basis of variations in Se isotopes in the deposit, along with other geological and geochemical evidence, the “redox model” (supergene alteration) explains the occurrence of native Se in the deposit. Overall, hydrothermal systems may be a potentially important Se source to form economic deposits in comparison to seawater sources. Significantly, our study indicates that either secondary hydrothermal or supergene alteration is a key factor in Se enrichment in black shales. Redistribution of Se, and probably other redox-sensitive metals like Mo, Cr and V, leads to isotopic fractionation which may be used to fingerprint such alteration/precipitation processes. |
| Author | Carignan, Jean Wen, Hanjie |
| Author_xml | – sequence: 1 givenname: Hanjie surname: Wen fullname: Wen, Hanjie email: wenhanjie@vip.gyig.ac.cn organization: State Key Laboratory of Ore Deposit Geochemistry (SKLODG), Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China – sequence: 2 givenname: Jean surname: Carignan fullname: Carignan, Jean organization: Centre de Recherches Petrographique et Geochimiques, CNRS, 15, Rue Notre-Dame-Pauvrves, B.P. 20, 54501, Vandoeuvre-les-Nancy Cedex, France |
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| Snippet | We analyzed the Se isotopic composition of black shales and related kerogen and sulfide fractions from the Zunyi Ni–Mo–Se deposit, the La’erma Se–Au deposit... We analyzed the Se isotopic composition of black shales and related kerogen and sulfide fractions from the Zunyi Ni-Mo-Se deposit, the La'erma Se-Au deposit... |
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| SubjectTerms | Alterations China chromium Deposition Deposits Fractionation isotope fractionation isotopes molybdenum Nickel seawater selenium Shale Sulfides |
| Title | Selenium isotopes trace the source and redox processes in the black shale-hosted Se-rich deposits in China |
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