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Origin of the volcanic-hosted Yamansu Fe deposit, Eastern Tianshan, NW China: constraints from pyrite Re-Os isotopes, stable isotopes, and in situ magnetite trace elements
Xiao-Wen Huang; Mei-Fu Zhou; Georges Beaudoin; Jian-Feng Gao; Liang Qi; Chuan Lyu
2018
发表期刊Mineralium Deposita
卷号53期号:7页码:1039-1060
摘要

The Yamansu Fe deposit (32Mt at 51% Fe) in the Eastern Tianshan Orogenic Belt of NW China is hosted in early Carboniferous volcano-sedimentary rocks and spatially associated with skarn. The paragenetic sequence includes garnet-diopside (I), magnetite (II), hydrous silicate-sulfide (III), and calcite-quartz (IV) stages. Pyrite associated with magnetite has a Re-Os isochron age of 322 +/- 7Ma, which represents the timing of pyrite and, by inference, magnetite mineralization. Pyrite has S-34(VCDT) values of -2.2 to +2.9 parts per thousand, yielding S-34(H2S) values of -3.1 to 2 parts per thousand, indicating the derivation of sulfur from a magmatic source. Calcite from stages II and IV has C-13(VPDB) values from -2.5 to -1.2 parts per thousand, and -1.1 to 1.1 parts per thousand, and O-18(VSMOW) values from 11.8 to 12.0 parts per thousand and -7.7 to -5.2 parts per thousand, respectively. Calculated C-13 values of fluid CO2 and water O-18 values indicate that stage II hydrothermal fluids were derived from magmatic rocks and that meteoric water mixed with the hydrothermal fluids in stage IV. Some ores contain magnetite with obvious chemical zoning composed of dark and light domains in BSE images. Dark domains have higher Mg, Al, Ca, Mn, and Ti but lower Fe and Cr contents than light domains. The chemical zoning resulted from a fluctuating fluid composition and/or physicochemical conditions (oscillatory zoning), or dissolution-precipitation (irregular zoning) via infiltration of magmatic-hydrothermal fluids diluted by late meteoric water. Iron was mainly derived from fluids similar to that in skarn deposits.

关键词Re-os Geochronology trace Elements magnetite dissolution-reprecipitation yamansu Fe Deposit
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/8867
专题矿床地球化学国家重点实验室
作者单位1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.Département de géologie et de génie géologique, Université Laval, Quebec City, QC G1V0A6, Canada
3.Department of Earth Sciences, The University of Hong Kong, Hong Kong, SAR, China
4.University of Chinese Academy of Sciences, Beijing 100049, China
推荐引用方式
GB/T 7714
Xiao-Wen Huang,Mei-Fu Zhou,Georges Beaudoin,et al. Origin of the volcanic-hosted Yamansu Fe deposit, Eastern Tianshan, NW China: constraints from pyrite Re-Os isotopes, stable isotopes, and in situ magnetite trace elements[J]. Mineralium Deposita,2018,53(7):1039-1060.
APA Xiao-Wen Huang,Mei-Fu Zhou,Georges Beaudoin,Jian-Feng Gao,Liang Qi,&Chuan Lyu.(2018).Origin of the volcanic-hosted Yamansu Fe deposit, Eastern Tianshan, NW China: constraints from pyrite Re-Os isotopes, stable isotopes, and in situ magnetite trace elements.Mineralium Deposita,53(7),1039-1060.
MLA Xiao-Wen Huang,et al."Origin of the volcanic-hosted Yamansu Fe deposit, Eastern Tianshan, NW China: constraints from pyrite Re-Os isotopes, stable isotopes, and in situ magnetite trace elements".Mineralium Deposita 53.7(2018):1039-1060.
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