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Magnetite geochemistry of the Longqiao and Tieshan Fe-(Cu) deposits in the Middle-Lower Yangtze River Belt: Implications for deposit type and ore genesis
Xia Hu;  Huayong Chen;  Liandang Zhao;  Jinsheng Han;  Xiaoping Xi
2017
Source PublicationOre Geology Reviews
Volume89Pages:822-835
Abstract

Magnetite is a common mineral in many ore deposits and their host rocks, and contains a wide range of trace elements (e.g., Ti, V, Mg, Cr, Mn, Ca, Al, Ni, Ga, Sn) that can be used for deposit type fingerprinting. In this study, we present new magnetite geochemical data for the Longqiao Fe deposit (Luzong, ore district) and Tieshan Fe-(Cu) deposit (Edong ore district), which are important magmatic-hydrothermal deposits in eastern China. 

Textural features, mineral assemblages and paragenesis of the Longqiao and Tieshan ore samples have suggested the, presence of two main mineralization periods (sedimentary and hydrothermal) at Longqiao, among which the hydrothermal period comprises four stages (skarn, magnetite, sulfide and carbonate); whilst the Tieshan Fe-(Cu) deposit comprises four mineralization stages (skarn, magnetite, quartz-sulfide and carbonate). 

Magnetite from the Longqiao and Tieshan deposits has different geochemistry, and can be clearly discriminated by the Sn vs. Ga, Ni vs. Cr, Ga vs. Al, Ni vs. Al, V vs. Ti, and Al vs. Mg diagrams. Such difference may be applied to distinguish other typical skarn (Tieshan) and multi-origin hydrothermal (Longqiao) deposits in the MLYRB. The fluid-rock interactions, influence of the co-crystallizing minerals and other physicochemical parameters, such as temperature and fO(2), may have altogether controlled the magnetite trace element contents of both deposits. The Tieshan deposit may have had higher degree of fO(2), but lower fluid-rock interactions and ore-forming temperature than the Longqiao deposit. The TiO2-Al(2)o(3)-(Mgo + Mno) and (Ca + Al + Mn) vs. (Ti + V) magnetite discrimination diagrams show that the Longqiao Fe deposit has both sedimentary and hydrothermal features, whereas the Tieshan Fe-(Cu) deposit is skarn-type and was likely formed via hydrothermal metasomatism, consistent with the ore characteristics observed.

KeywordMagnetite Chemistry Longqiao Fe Deposit Tieshan Fe–(Cu) Deposit Skarn Middle–lower Yangtze River Belt (Mlyrb Eastern China)
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8025
Collection矿床地球化学国家重点实验室
Affiliation1.Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China
3.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
4.State Key Laboratory of Isotope Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
Recommended Citation
GB/T 7714
Xia Hu;Huayong Chen;Liandang Zhao;Jinsheng Han;Xiaoping Xi. Magnetite geochemistry of the Longqiao and Tieshan Fe-(Cu) deposits in the Middle-Lower Yangtze River Belt: Implications for deposit type and ore genesis[J]. Ore Geology Reviews,2017,89:822-835.
APA Xia Hu;Huayong Chen;Liandang Zhao;Jinsheng Han;Xiaoping Xi.(2017).Magnetite geochemistry of the Longqiao and Tieshan Fe-(Cu) deposits in the Middle-Lower Yangtze River Belt: Implications for deposit type and ore genesis.Ore Geology Reviews,89,822-835.
MLA Xia Hu;Huayong Chen;Liandang Zhao;Jinsheng Han;Xiaoping Xi."Magnetite geochemistry of the Longqiao and Tieshan Fe-(Cu) deposits in the Middle-Lower Yangtze River Belt: Implications for deposit type and ore genesis".Ore Geology Reviews 89(2017):822-835.
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