Subduction zone sulfur mobilization and redistribution by intraslab fluid-rock interaction
文献类型：期刊论文
| 作者 | Li, Ji-Lei1,2; Schwarzenbach, Esther M.3; John, Timm3; Ague, Jay J.4; Tassara, Santiago4; Gao, Jun1,2; Konecke, Brian A.5 |
| 刊名 | GEOCHIMICA ET COSMOCHIMICA ACTA
 |
| 出版日期 | 2021-03-15 |
| 卷号 | 297页码:40-64 |
| 关键词 | Sulfur Slab fluids Fluid-rock interaction Vein Eclogite Tianshan |
| ISSN号 | 0016-7037 |
| DOI | 10.1016/j.gca.2021.01.011 |
| 英文摘要 | Subduction zones mediate the sulfur exchange between Earth's interior and surface, and play a critical role in the long-term global sulfur cycle. Dehydration of the subducted slab releases aqueous fluids, which in turn interact with the surrounding wall-rocks during reactive flow through the slab. Fluids are regarded as the key agent for sulfur transfer within the slab and subsequently into the mantle wedge. However, the mechanisms underlying sulfur mobilization and redistribution during fluid-rock interaction are not fully understood. Here, we investigate three high-pressure blueschist/eclogite-selvage-vein systems from the Southwestern Tianshan metamorphic belt in northwestern China to explore sulfur behavior during fluid-rock interaction along channelized fluid pathways and within their alteration halos. Petrologic observations on mineral parageneses and delta S-34 compositions of sulfides reveal two different scenarios of sulfur mobilization and redistribution during fluid-rock interaction at HP conditions. Fe-rich and medium-fS(2) (near the pyrite-pyrrhotite buffer) fluids favor pyrrhotite stability over pyrite and can trigger the pyrite-to-pyrrhotite transition in the reaction halo. In this case the bulk-rock sulfur budget may not vary but the sulfur isotope exchange is still effective, producing a delta S-34 mixing trend in the metasomatic zones. In contrast, Fepoor and high-fS(2) fluids cause conversion of pyrrhotite to pyrite, significant sulfur addition, and sulfur isotope exchange in alteration selvages. Medium-fS(2) fluids can transport sulfur and thus are effective in transferring sulfur out of the slab, whereas high-fS(2) fluids cause sulfur sequestration along fluid pathways and considerably reduce long-distance sulfur transfer. Multiple fluid infiltration events with different fluid sources result in several pyrite overgrowth sequences, recorded by contrasting CoNi element distributions and in-situ delta S-34 zoning of pyrite. The heaviest delta S-34 value (+25%) thus far reported in HP rocks has been found in vein pyrite, suggesting that a seawater sulfate-derived delta S-34 signature can be transported to great depths in a subduction zone, even though the timing and mechanism of sulfate-to-sulfide reduction in the subduction zone remain unconstrained. Our study provides natural evidence for fluid-mediated sulfide transformation, sulfur transport/storage, and sulfur isotope exchange during fluid-rock interaction, and illuminates the role these processes play in sulfur release from the subducting slab and sulfur subduction into the deep mantle. (C) 2021 Elsevier Ltd. All rights reserved. |
| 资助项目 | National Key Research and Development Program of China[2018YFA0702700] ; National Natural Science Foundation of China[41772056] ; National Natural Science Foundation of China[41972060] ; Youth Innovation Promotion Association CAS[2018090] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000623924000003 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/101032]  |
| 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 | Li, Ji-Lei |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, POB 9825, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China 3.Free Univ Berlin, Inst Geolog Wissensch, Malteserstr 74-100, D-12249 Berlin, Germany 4.Yale Univ, Dept Earth & Planetary Sci, POB 208109, New Haven, CT 06511 USA 5.NASA Johnson Space Ctr, Astromat Res & Explorat Sci ARES, Houston, TX USA |
| 推荐引用方式 GB/T 7714 | Li, Ji-Lei,Schwarzenbach, Esther M.,John, Timm,et al. Subduction zone sulfur mobilization and redistribution by intraslab fluid-rock interaction[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2021,297:40-64. |
| APA | Li, Ji-Lei.,Schwarzenbach, Esther M..,John, Timm.,Ague, Jay J..,Tassara, Santiago.,...&Konecke, Brian A..(2021).Subduction zone sulfur mobilization and redistribution by intraslab fluid-rock interaction.GEOCHIMICA ET COSMOCHIMICA ACTA,297,40-64. |
| MLA | Li, Ji-Lei,et al."Subduction zone sulfur mobilization and redistribution by intraslab fluid-rock interaction".GEOCHIMICA ET COSMOCHIMICA ACTA 297(2021):40-64. |
入库方式： OAI收割
来源：地质与地球物理研究所
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