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In-situ LA-ICP-MS trace elemental analyses of magnetite and Re–Os dating of pyrite: The Tianhu hydrothermally remobilized sedimentary Fe deposit, NW China
Xiao-Wen Huang;  Jian-Feng Gao;  Liang Qi;  Mei-Fu Zhou
2015
Source PublicationOre Geology Reviews
Volume65Issue:Part 4Pages:900-916
Abstract

The Tianhu Fe deposit (> 104 Mt at 42% TFe) in the Eastern Tianshan (NW China) is hosted in the schist, quartzite, marble, and amphibolite of the Neoproterozoic Tianhu Group. The deposit consists of disseminated, banded and massive ores. Metallic minerals are dominantly magnetite and pyrite, with minor titanite, pyrrhotite, chalcopyrite, and sphalerite. Gangue minerals include dolomite with minor forsterite, diopside, apatite, biotite, chlorite, tourmaline, tremolite, talc, calcite, and magnesite. Pyrite separates from ores have 10.7 to 54.7 ppb Re and 0.033 to 0.175 ppb common Os. Those from the massive ores have a model 1 isochron age of 535 ± 36 Ma (2σ), in agreement with the isochron age (528 ± 18 Ma) of pyrite from the banded ores by regression of seven Re–Os analyses. The Re–Os age of ~ 530 Ma reflects the timing of a hydrothermal event that remobilized the Tianhu deposit. Magnetite has Mg, Al, Ti, V, Mn, Zn, and Ga contents ranging from ~ 5 to 3500 ppm and Cr, Co, Ni, and Sn contents ranging from ~ 1 to 200 ppm. Most magnetite grains have Ca + Al + Mn and Ti + V contents similar to those of the banded iron formation (BIF). Some grains have elevated Ti and V contents, indicating that that magnetite was formed by sedimentary process and overprinted by hydrothermal activity. Pyrite has δ34SCDT values from − 9.23 to 10.96‰, indicating that the sulfur was reduced from the marine sulfates either by bacterial or thermochemical processes. Pyrite has relatively high Co (~ 346 to 3274 ppm) but low Ni (~ 5.6 to 35.4 ppm) with Co/Ni ratios ranging from ~ 10 to 270, indicating remobilization from a volcanic–hydrothermal fluid. Therefore, the Tianhu Fe deposit was originally a sedimentary type deposit but was overprinted by a hydrothermal event related to volcanic activity.

KeywordRe–os Isotopes pyrite la-icp‐ms magnetite remobilizationtianhu Fe Deposit
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/9553
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China
3.Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
Recommended Citation
GB/T 7714
Xiao-Wen Huang;Jian-Feng Gao;Liang Qi;Mei-Fu Zhou. In-situ LA-ICP-MS trace elemental analyses of magnetite and Re–Os dating of pyrite: The Tianhu hydrothermally remobilized sedimentary Fe deposit, NW China[J]. Ore Geology Reviews,2015,65(Part 4):900-916.
APA Xiao-Wen Huang;Jian-Feng Gao;Liang Qi;Mei-Fu Zhou.(2015).In-situ LA-ICP-MS trace elemental analyses of magnetite and Re–Os dating of pyrite: The Tianhu hydrothermally remobilized sedimentary Fe deposit, NW China.Ore Geology Reviews,65(Part 4),900-916.
MLA Xiao-Wen Huang;Jian-Feng Gao;Liang Qi;Mei-Fu Zhou."In-situ LA-ICP-MS trace elemental analyses of magnetite and Re–Os dating of pyrite: The Tianhu hydrothermally remobilized sedimentary Fe deposit, NW China".Ore Geology Reviews 65.Part 4(2015):900-916.
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