Constraints of Fe-S-C stable isotopes on hydrothermal and microbial activities during formation of sediment-hosted stratiform sulfide deposits
文献类型：期刊论文
| 作者 | Qiu, Wenhong Johnson1,6; Zhou, Mei-Fu1,5; Li, Xiaochun2,4; Huang, Fang3; Malpas, John1 |
| 刊名 | GEOCHIMICA ET COSMOCHIMICA ACTA
 |
| 出版日期 | 2021-11-15 |
| 卷号 | 313页码:195-213 |
| ISSN号 | 0016-7037 |
| 关键词 | Iron isotope Sulfur isotope Isotope fractionation Sediment-hosted stratiform sulfide deposit |
| DOI | 10.1016/j.gca.2021.07.036 |
| 英文摘要 | Microbial and hydrothermal venting activities on the seafloor are important for the formation of sediment-hosted stratiform sulfide (SHSS) deposits. Fe isotopic compositions are sensitive to both microbial and hydrothermal activities and may be used to investigate the formation of these deposits. However, to the best of our knowledge, no Fe isotopic studies have been conducted on SHSS deposits. In the Devonian Dajiangping SHSS-type pyrite deposit (389 Ma), South China, laminated pyrite ores were precipitated from exhalative hydrothermal fluids, whereas black shales were deposited during intervals with no exhalation. Pyrite grains from black shales mostly display positive delta Fe-56(-py) (0.01-0.73%), higher than marine sediments (ca. 0%), due to pyrite deriving Fe from basinal shuttled Fe(III) (hydr-)oxides and slowly crystallizing in pores of sediments with equilibrium fractionation, except for negative delta Fe-56(-py) (-0.17% to -0.24%) of two samples caused by mixing of Fe from underlain laminated ores. The positive delta S-34(-py) (3.50-24.5%) of black shales reflect that sulfur of pyrite originated from quantitative reduction of sulfate in closed pores of sediments. In contrast, pyrite grains of laminated ores have negative delta Fe-56(-py) (-0.60% to -0.21%), which were not only inherited from the negative delta Fe-56 of hydrothermal fluids but also caused by kinetic fractionation during rapid precipitation of a pyrite precursor (FeS) in hydrothermal plumes. These ores have negative delta S-34(-py) (- 28.7% to - 1.82%), because H2S for pyrite mineralization was produced by bacterial sulfate reduction (BSR) in a sulfate-rich seawater column or shallow sediments. The delta Fe-56(-py) values of laminated ores co-vary positively with delta S-34(-py) and delta C-13(-carbonate) along the ore stratigraphy, with delta C-13(-carbonate) values ranging from -12.0% to -2.50%. However, they correlate negatively with aluminum-normalized total organic carbon (TOC/Al2O3). Organic carbon is thus considered to enhance the production of H2S by BSR activities, increase pyrite precipitation rates and promote the expression of kinetic fractionation of Fe isotopes. Intriguingly, in the ore units with vigorous hydrothermal venting activities, delta Fe-56(-py), delta S-34(-py) and delta C-13(-carbonate) values display a consistently increasing trend. Such results suggest that venting hydrothermal fluids significantly inhibited the H2S production of BSR, which then reduced the pyrite crystallization rate and decreased the kinetic fractionation of Fe isotopes. Our study reveals that the formation of SHSS deposits relies on H2S from microbial activities and metals from hydrothermal exhalation on the seafloor, but that vigorous exhalation can inhibit microbial activities and thus sulfide precipitation rates. The integrated use of Fe, S, and C isotopes can effectively elucidate these dynamic interactions between hydrothermal venting and microbial activities during the formation of SHSS deposits. (C) 2021 Elsevier Ltd. All rights reserved. |
| WOS关键词 | MID-ATLANTIC RIDGE ; SULFATE REDUCTION ; SELWYN BASIN ; ANAEROBIC OXIDATION ; IRON ISOTOPES ; SOUTH CHINA ; PYRITE FORMATION ; SEDEX DEPOSITS ; GENETIC MODEL ; COUPLED FE |
| 资助项目 | National Natural Science Foundation of China[NSFC: 41772087] ; General Research Fund of Hong Kong[GRF: 7306814] ; Science and Technology Development Fund of Macau[FDCT: 0003/2019/APD] ; Science and Technology Development Fund of Macau[002/2018/A1] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| WOS记录号 | WOS:000707120400003 |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; General Research Fund of Hong Kong ; General Research Fund of Hong Kong ; Science and Technology Development Fund of Macau ; Science and Technology Development Fund of Macau ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; General Research Fund of Hong Kong ; General Research Fund of Hong Kong ; Science and Technology Development Fund of Macau ; Science and Technology Development Fund of Macau ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; General Research Fund of Hong Kong ; General Research Fund of Hong Kong ; Science and Technology Development Fund of Macau ; Science and Technology Development Fund of Macau ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; General Research Fund of Hong Kong ; General Research Fund of Hong Kong ; Science and Technology Development Fund of Macau ; Science and Technology Development Fund of Macau |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/102972]  |
| 专题 | 地质与地球物理研究所_中国科学院矿产资源研究重点实验室 |
| 通讯作者 | Zhou, Mei-Fu |
| 作者单位 | 1.Univ Hong Kong, Dept Earth Sci, Hong Kong 999077, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 3.Univ Sci & Technol China, Dept Earth & Space Sci, CAS Key Lab CrustMantle Mat & Environm, Hefei 230026, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 10029, Peoples R China 5.China Univ Geosci Wuhan, Sch Earth Resource, Wuhan 430074, Peoples R China 6.Univ St Joseph, Inst Sci & Environm ISE, Macau 999078, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qiu, Wenhong Johnson,Zhou, Mei-Fu,Li, Xiaochun,et al. Constraints of Fe-S-C stable isotopes on hydrothermal and microbial activities during formation of sediment-hosted stratiform sulfide deposits[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2021,313:195-213. |
| APA | Qiu, Wenhong Johnson,Zhou, Mei-Fu,Li, Xiaochun,Huang, Fang,&Malpas, John.(2021).Constraints of Fe-S-C stable isotopes on hydrothermal and microbial activities during formation of sediment-hosted stratiform sulfide deposits.GEOCHIMICA ET COSMOCHIMICA ACTA,313,195-213. |
| MLA | Qiu, Wenhong Johnson,et al."Constraints of Fe-S-C stable isotopes on hydrothermal and microbial activities during formation of sediment-hosted stratiform sulfide deposits".GEOCHIMICA ET COSMOCHIMICA ACTA 313(2021):195-213. |
入库方式： OAI收割
来源：地质与地球物理研究所
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