The Woxi W-Sb-Au deposit in Hunan, South China: An example of Late Proterozoic sedimentary exhalative (SEDEX) mineralization
文献类型：期刊论文
| 作者 | Gu, X. X.1; Zhang, Y. M.1; Schulz, O.2; Vavtar, F.2; Liu, J. M.3; Zheng, M. H.4; Zheng, L.1 |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2012-09-05 |
| 卷号 | 57页码:54-75 |
| ISSN号 | 1367-9120 |
| 关键词 | Ore texture Ore geochemistry Sedimentary exhalation Stratiform W-Sb-Au deposit Woxi South China |
| DOI | 10.1016/j.jseaes.2012.06.006 |
| 文献子类 | Article |
| 英文摘要 | The Woxi W-Sb-Au deposit in Hunan, South China is hosted by Proterozoic metasedimentary rocks, a turbiditic sequence of graywacke, siltstone, sandy slate and slate. The deposit has two principal styles of mineralization: stratiform and stockwork. The stratiform ores, which account for about 75% of the total proven ore reserves, are composed predominantly of interbedded, massive to laminated Au-bearing quartz, stibnite, scheelite, pyrite, and silty clays. Fine layering, at the macro- to microscale, is the most striking feature of the ores, with individual mm- to cm-scale bands traceable over distances of several meters to a few hundred meters along strike. Structures indicative of soft-sediment deformation due to slumping and synsedimentary sliding are commonly observed in the banded ores and the barren quartz-carbonate beds in the adjacent host rocks. The stockwork mineralization accounts for about 25% of the total ore reserves and is restricted to a 3-10 m-thick zone immediately beneath the stratiform ores. It is characterized by numerous quartz + pyrite +/- scheelite stringer veins that are either subparallel or near perpendicular to the overlying stratiform ore layers. Alteration at Woxi occurs as semiconformable, tabular blankets asymmetrically enveloping the orebodies along their entire length, and, is dominated by a quartz + sericite + chlorite +/- carbonate assemblage. The footwall alteration is generally more intense and somewhat thicker than the hanging-wall alteration. Geochemical data show that, with distance above and below the mineralized horizons, contents of W, Au, As, and Sb systematically decrease, whereas concentrations of other trace elements such as Hf, Sc, Th, Ta, Y, Zr, Nb and REEs gradually increase. This may reflect a decreasing hydrothermal input in the sediments and an increasing dominance of detrital and seawater-derived components. The chondrite-normalized REE patterns of both bulk ores and individual minerals are comparable to those of many SEDEX-type deposits and associated exhalites, implying similar mineralizing fluids for these deposits. Sulfides from the ore have negative and variable delta S-34 values (from -12.3 parts per thousand to -1.2 parts per thousand), suggesting a dominant sulfur contribution of bacterial sulfate reduction. A syngenetic (SEDEX) model is thus proposed for the formation of the Woxi deposit. Convective seawater circulated through the sediment pile and episodically vented metalliferous hydrothermal fluids onto the sea floor. Each exhalative episode was preceded by a period dominated by chemical and turbiditic sedimentation (footwall alteration blanket), followed by a peak release of hot metalliferous brines (stratiform ores and associated stringers), and terminated by a waning influx of hydrothermal fluids accompanying burial by later turbidites (hanging-wall alteration blanket). (C) 2012 Elsevier Ltd. All rights reserved. |
| WOS关键词 | RARE-EARTH-ELEMENT ; EAST PACIFIC RISE ; PLASMA-MASS SPECTROMETRY ; LEAD-ZINC DEPOSITS ; SULFIDE DEPOSIT ; BRITISH-COLUMBIA ; SULFUR ISOTOPE ; SOUTHEASTERN CHINA ; SPREADING CENTERS ; FLUID INCLUSIONS |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| WOS记录号 | WOS:000308782000007 |
| 资助机构 | National Natural Science Foundation of China (NSFC)(40930423/49872038) ; National Natural Science Foundation of China (NSFC)(40930423/49872038) ; Scientific Research Foundation of Austria (FWF)(P12026-GEO) ; Scientific Research Foundation of Austria (FWF)(P12026-GEO) ; 973 National Basic Research Priorities Programme(2009CB421003-01) ; 973 National Basic Research Priorities Programme(2009CB421003-01) ; Project 111 from the Ministry of Education of China ; Project 111 from the Ministry of Education of China ; National Natural Science Foundation of China (NSFC)(40930423/49872038) ; National Natural Science Foundation of China (NSFC)(40930423/49872038) ; Scientific Research Foundation of Austria (FWF)(P12026-GEO) ; Scientific Research Foundation of Austria (FWF)(P12026-GEO) ; 973 National Basic Research Priorities Programme(2009CB421003-01) ; 973 National Basic Research Priorities Programme(2009CB421003-01) ; Project 111 from the Ministry of Education of China ; Project 111 from the Ministry of Education of China ; National Natural Science Foundation of China (NSFC)(40930423/49872038) ; National Natural Science Foundation of China (NSFC)(40930423/49872038) ; Scientific Research Foundation of Austria (FWF)(P12026-GEO) ; Scientific Research Foundation of Austria (FWF)(P12026-GEO) ; 973 National Basic Research Priorities Programme(2009CB421003-01) ; 973 National Basic Research Priorities Programme(2009CB421003-01) ; Project 111 from the Ministry of Education of China ; Project 111 from the Ministry of Education of China ; National Natural Science Foundation of China (NSFC)(40930423/49872038) ; National Natural Science Foundation of China (NSFC)(40930423/49872038) ; Scientific Research Foundation of Austria (FWF)(P12026-GEO) ; Scientific Research Foundation of Austria (FWF)(P12026-GEO) ; 973 National Basic Research Priorities Programme(2009CB421003-01) ; 973 National Basic Research Priorities Programme(2009CB421003-01) ; Project 111 from the Ministry of Education of China ; Project 111 from the Ministry of Education of China |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/84464]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Gu, X. X. |
| 作者单位 | 1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China 2.Univ Innsbruck, Inst Mineral & Petrog, A-6020 Innsbruck, Austria 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100101, Peoples R China 4.Chengdu Univ Technol, Coll Earth Sci, Chengdu 610059, Peoples R China |
| 推荐引用方式 GB/T 7714 | Gu, X. X.,Zhang, Y. M.,Schulz, O.,et al. The Woxi W-Sb-Au deposit in Hunan, South China: An example of Late Proterozoic sedimentary exhalative (SEDEX) mineralization[J]. JOURNAL OF ASIAN EARTH SCIENCES,2012,57:54-75. |
| APA | Gu, X. X..,Zhang, Y. M..,Schulz, O..,Vavtar, F..,Liu, J. M..,...&Zheng, L..(2012).The Woxi W-Sb-Au deposit in Hunan, South China: An example of Late Proterozoic sedimentary exhalative (SEDEX) mineralization.JOURNAL OF ASIAN EARTH SCIENCES,57,54-75. |
| MLA | Gu, X. X.,et al."The Woxi W-Sb-Au deposit in Hunan, South China: An example of Late Proterozoic sedimentary exhalative (SEDEX) mineralization".JOURNAL OF ASIAN EARTH SCIENCES 57(2012):54-75. |
入库方式： OAI收割
来源：地质与地球物理研究所
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