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

	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
发表期刊	Ore Geology Reviews
卷号	65 期号:1 页码:900-916
摘要	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 (20), 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 similar to 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 similar to 5 to 3500 ppm and Cr, Co, Ni, and Sn contents ranging from similar to 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 delta S-34(CDT) 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 (similar to 346 to 3274 ppm) but low Ni (similar to 5.6 to 35.4 ppm) with Co/Ni ratios ranging from similar to 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.
学科领域	矿床地球化学
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/352002/6000
专题	矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文矿床地球化学国家重点实验室
推荐引用方式 GB/T 7714	Xiao-Wen Huang,Jian-feng Gao,Liang Qi,et al. 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(1):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(1),900-916.
MLA	Xiao-Wen Huang,et al."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 65.1(2015):900-916.

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