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In-situ LA–ICP–MS trace elements analysis of magnetite: The Fenghuangshan Cu–Fe–Au deposit, Tongling, Eastern China
Xiao-Wen Huang;  Jian-Feng Gao;  Liang Qi;  Yu-Miao Meng;  Yi-Chang Wang;  Zhi-Hui Da
2016
Source PublicationOre Geology Reviews
Volume72Issue:Part 1Pages:746-759
Abstract

The Fenghuangshan deposit is a typical Cu–Fe–Au skarn deposit in the Tongling area, Anhui province, Eastern China. The deposit has a paragenetic sequence of a prograde skarn stage, followed by a retrograde skarn stage, and a final quartz–sulfide and carbonate stages. Magnetite in the Fenghuangshan deposit mainly formed in the retrograde and carbonate stages. According to the morphology of magnetite and mineral assemblage of ores, we divided magnetite-bearing ores into three groups. Group 1 (early retrograde skarn stage) is represented by a mineral assemblage of magnetite and chalcopyrite. Group 2 (late retrograde skarn stage) has a mineral assemblage of magnetite, chalcopyrite, and wollastonite with characteristic ring-like magnetite. Group 3 (carbonate stage) is characterized by large amounts of calcite veins crosscut or associated with magnetite and intensive hematization of magnetite crosscut by the veins.

Laser ablation (LA)–ICP–MS was used to determine trace element concentrations of magnetite from the three mineralization stages. Positive correlations among Mg, Al, Ca, and Si in magnetite indicate that these lithophile elements have similar behavior during the skarn formation process. Calcium is an important discriminant element for magnetite in skarn deposits. Positive correlations are also evident for Pb, Sn and W in magnetite, which also indicates their similar behavior. In general, magnetite grains of different stages have similar normalized trace element patterns, indicating that they share a common source. However, some elements such as Co and Mn in magnetite decrease from early retrograde skarn stage, late retrograde skarn stage to carbonate stage, which may be attributed to the precipitation of coexisting minerals (sulfides and carbonates) or the decreasing temperature. Magnetite grains of the retrograde stage have higher Mg + Mn and Si + Al contents than those of the carbonate stage, indicating a decreasing degree of fluid–rock interaction during the skarn formation process. Trace element data of skarn magnetite indicate a more widely compositional variation than previously suggested. Magnetite from the Fenghuangshan Cu–Fe–Au deposit has similar composition to those from other Cu, Cu–Fe or Cu polymetallic skarn deposits, but different from those from Fe skarn deposits, such that magnetite composition is very powerful in establishing the origin of skarn deposits.

KeywordTrace Element la–icp–ms magnetite skarn fenghuangshan eastern China
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/9602
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 550081, China
2.State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
Recommended Citation
GB/T 7714
Xiao-Wen Huang;Jian-Feng Gao;Liang Qi;Yu-Miao Meng;Yi-Chang Wang;Zhi-Hui Da. In-situ LA–ICP–MS trace elements analysis of magnetite: The Fenghuangshan Cu–Fe–Au deposit, Tongling, Eastern China[J]. Ore Geology Reviews,2016,72(Part 1):746-759.
APA Xiao-Wen Huang;Jian-Feng Gao;Liang Qi;Yu-Miao Meng;Yi-Chang Wang;Zhi-Hui Da.(2016).In-situ LA–ICP–MS trace elements analysis of magnetite: The Fenghuangshan Cu–Fe–Au deposit, Tongling, Eastern China.Ore Geology Reviews,72(Part 1),746-759.
MLA Xiao-Wen Huang;Jian-Feng Gao;Liang Qi;Yu-Miao Meng;Yi-Chang Wang;Zhi-Hui Da."In-situ LA–ICP–MS trace elements analysis of magnetite: The Fenghuangshan Cu–Fe–Au deposit, Tongling, Eastern China".Ore Geology Reviews 72.Part 1(2016):746-759.
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