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DIRECT Re-Os DATING OF MANGANESE CARBONATE ORES AND IMPLICATIONS FOR THE FORMATION OF THE ORTOKARNASH MANGANESE DEPOSIT, NORTHWEST CHINA

文献类型：期刊论文

作者Li, Wen-Jun2,4,5; Peng, Zi-Dong2,5; Dong, Zhi-Guo2,4,5; Zhang, Bang-Lu3,6,7; Gao, Bing -Yu2,4,5; Zhang, Lian-Chang2,4,5; Zhu, Ming -Tian2,5; Robbins, Leslie J.1; Konhauser, Kurt O.8
刊名ECONOMIC GEOLOGY
出版日期2022
卷号117期号:1页码:237-252
ISSN号0361-0128
DOI10.5382/econgeo.4865
英文摘要Sedimentary manganese carbonate deposits, the major economic source of Mn globally, are the product of complex interactions that occur in the marine environment, including both biological Mn(II) oxidation and Mn(IV) reduction. Precise and accurate age constraints for Mn carbonate deposits have been difficult to obtain, hindering the understanding of possible correlations between Mn metallogenic and paleoenvironmental processes at regional to global scale. The involvement of organic matter during Mn carbonate mineralization, however, allows for the Re-Os system, an ideal geochronological tool for determining the depositional or alteration ages of organic-rich rocks, to be applied. Here we present the first Re-Os systematics of Mn carbonate ores from the giant Ortokarnash Mn deposit in the West Kunlun orogenic belt, Xinjiang, China. The use of the Re-Os geochronometer, along with petrographic, whole-rock total organic carbon, and major element analyses, allows for the depositional age and mineralizing processes to be directly constrained. The Mn carbonate ores with relatively homogeneous initial Os-187/Os-188 values yield a robust mineralization age of 320.3 +/- 6.6 Ma (Model 1; Isoplot regression) or 321.8 +/- 14.5 Ma (Monte Carlo simulation). This age correlates well with U-Pb ages of the youngest detrital zircon group from the footwall volcanic breccia-bearing limestone and a newly obtained Re-Os age from the hanging-wall marlstones. Enrichment of hydrogenous Re and Os in the Ortokarnash Mn carbonate ores is likely related to the variable redox environments during Mn carbonate mineralization, where Re tends to be preserved in the organic matter that persists following the diagenetic reduction of the Mn(IV) oxyhydroxides in suboxic or anoxic sediment pore water. Conversely, Os was likely absorbed by Mn(IV) oxyhydroxides in oxic seawater during Mn(II) oxidation. Elevated Osinitial( i) for the Mn carbonate ores relative to that of the coeval global seawater value suggests that an increased riverine flux may have been a contributing factor leading to Mn mineralization.
WOS关键词RICH SEDIMENTARY-ROCKS ; ISOTOPIC COMPOSITION ; GEOCHEMICAL CYCLE ; OSMIUM ISOTOPES ; WESTERN KUNLUN ; PORE WATERS ; U-PB ; RHENIUM ; SEA ; ENVIRONMENT
资助项目National Science Foundation of China[U1703242] ; National Science Foundation of China[41902078] ; National Science Foundation of China[2019QZKK0802] ; National Key R&D Program of China[2018YFC0604001] ; National Key R&D Program of China[2020YFA0714803]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000722569800004
出版者SOC ECONOMIC GEOLOGISTS, INC
资助机构National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/103867]  
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Zhang, Lian-Chang
作者单位1.Univ Regina, Dept Geol, Regina, SK S4S 0A2, Canada
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.China Geol Survey, Dev & Res Ctr, Beijing 100037, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
6.China Univ Geosci, Beijing 100083, Peoples R China
7.Minist Nat Resources Peoples Republ China, Mineral Explorat Tech Guidance Ctr, Beijing 100083, Peoples R China
8.Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB T6G 2E3, Canada
推荐引用方式
GB/T 7714		 Li, Wen-Jun,Peng, Zi-Dong,Dong, Zhi-Guo,et al. DIRECT Re-Os DATING OF MANGANESE CARBONATE ORES AND IMPLICATIONS FOR THE FORMATION OF THE ORTOKARNASH MANGANESE DEPOSIT, NORTHWEST CHINA[J]. ECONOMIC GEOLOGY,2022,117(1):237-252.
APA Li, Wen-Jun.,Peng, Zi-Dong.,Dong, Zhi-Guo.,Zhang, Bang-Lu.,Gao, Bing -Yu.,...&Konhauser, Kurt O..(2022).DIRECT Re-Os DATING OF MANGANESE CARBONATE ORES AND IMPLICATIONS FOR THE FORMATION OF THE ORTOKARNASH MANGANESE DEPOSIT, NORTHWEST CHINA.ECONOMIC GEOLOGY,117(1),237-252.
MLA Li, Wen-Jun,et al."DIRECT Re-Os DATING OF MANGANESE CARBONATE ORES AND IMPLICATIONS FOR THE FORMATION OF THE ORTOKARNASH MANGANESE DEPOSIT, NORTHWEST CHINA".ECONOMIC GEOLOGY 117.1(2022):237-252.

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来源：地质与地球物理研究所

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