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Cobalt concentration in a sulfidic sea and mobilization during orogenesis: Implications for targeting epigenetic sediment-hosted Cu-Co deposits

文献类型：期刊论文

作者Qiu, Zheng-Jie6,7; Fan, Hong-Rui5,6,7; Goldfarb, Richard4; Tomkins, Andrew G.1; Yang, Kui-Feng5,6,7; Li, Xiao-Chun5,6,7; Xie, Lie-Wen3,6; Liu, Xuan2
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2021-07-15
卷号305页码:1-18
关键词Cobalt source Sediment-hosted Cu-Co deposit Great oxygenation event Sulfidic sea In situ Fe-S isotope
ISSN号0016-7037
DOI10.1016/j.gca.2021.05.001
英文摘要The origin of sediment-hosted copper-cobalt deposits (SCDs) within metamorphic terranes remains contentious, particularly in regard to the timing of mineralization relative to basin evolution. Here, we link the timing of Cu-Co mineralization in the Zhongtiao Mountains district, central China, to basin closure during development of the Trans-North China Orogen. Metamorphic apatite from meta-evaporite has a U-Pb age (1844 +/- 25 Ma) within error of a Re-Os age for molybdenite from Cu- and Co-bearing veins (1819 +/- 10 Ma), implying that mineralization and metamorphism were coincident. In situ trace element and Fe-S isotope analyses of deformed sedimentary pyrite (Py I) and younger euhedral metamorphic pyrite (Py II) in pyritic graphite schist indicate that Co was mobilized from Py I via fluid-mediated dissolution and reprecipitation. In the graphite schist, representing a sulfidic shale metamorphosed at upper greenschist facies conditions, relic Py I has high delta S-34 values (22.9 +/- 0.4 parts per thousand, n = 10) and delta Fe-5(6) values (0.90 +/- 0.16 parts per thousand, n = 8). These values are consistent with bacterial sulfate reduction and pyrite formation in a Paleoproterozoic sulfidic sea (i.e., after the first great oxygenation event). In addition, Py I has unusually high Co contents (0.8-3.0 wt.%), suggesting that transition metals, including Co and Ni, were originally concentrated in sedimentary pyrite in an evaporative setting. The evaporitic setting is supported by the presence of sylvite in sulfidic schists and adjacent scapolitic calc-silicates. Younger Co-poor Py II has slightly lower delta S-3(4) values (21.4 +/- 0.2 parts per thousand, n = 19) and higher delta Fe-56 values (1.61 +/- 0.15 parts per thousand, n = 9), supporting the hypothesis that Co was released from sedimentary sulfide during dissolution and reprecipitation. The great variability of delta S-3(4) (14.8 to 22.9 parts per thousand) and delta Fe-56 (0.13 to 2.30 parts per thousand) in hydrothermal pyrite (Py III) associated with Cu-Co mineralization suggests that an external Cu-rich oxidizing fluid was involved in the ore-forming process. Copper and Co in this type of deposit are typically both considered to be derived from fertile basement rocks. This study, however, highlights another potential source for the Co, with its enrichment in a sulfidic sea along an evaporative margin and its upgrading through mobilization during orogenesis that leads to formation of a relatively high-temperature group of SCDs. Tectonometamorphic processes causing such Co enrichments took place during the Paleoproterozoic and Neoproterozoic oxygenation events, implying that the most prospective targets for Co resources are concentrated in ca. 2.2-2.0 Ga and 0.9-0.7 Ga deformed passive margin marine sequences. (C) 2021 Elsevier Ltd. All rights reserved.
WOS关键词SULFUR ISOTOPE FRACTIONATION ; TRACE-ELEMENT CONTENT ; ZHONGTIAO MOUNTAINS ; COPPER-DEPOSIT ; PYRITE ; OXYGEN ; OCEAN ; GOLD ; IRON ; EVOLUTION
资助项目National Nature Science Foundation of China[41890833] ; National Nature Science Foundation of China[41902080]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000660120900001
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/102054]  
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
地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Fan, Hong-Rui
作者单位1.Monash Univ, Sch Earth Atmosphere & Environm, Clayton, Vic 3800, Australia
2.Univ Lorraine, CNRS, GeoRessources Lab, F-54500 Vandoeuvre Les Nancy, France
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.China Univ Geosci, Beijing 100083, Peoples R China
5.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
6.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
7.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Qiu, Zheng-Jie,Fan, Hong-Rui,Goldfarb, Richard,et al. Cobalt concentration in a sulfidic sea and mobilization during orogenesis: Implications for targeting epigenetic sediment-hosted Cu-Co deposits[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2021,305:1-18.
APA Qiu, Zheng-Jie.,Fan, Hong-Rui.,Goldfarb, Richard.,Tomkins, Andrew G..,Yang, Kui-Feng.,...&Liu, Xuan.(2021).Cobalt concentration in a sulfidic sea and mobilization during orogenesis: Implications for targeting epigenetic sediment-hosted Cu-Co deposits.GEOCHIMICA ET COSMOCHIMICA ACTA,305,1-18.
MLA Qiu, Zheng-Jie,et al."Cobalt concentration in a sulfidic sea and mobilization during orogenesis: Implications for targeting epigenetic sediment-hosted Cu-Co deposits".GEOCHIMICA ET COSMOCHIMICA ACTA 305(2021):1-18.

入库方式： OAI收割

来源：地质与地球物理研究所

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