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Geochemistry of magnetite from Fe-Cu deposits in the Kangdian metallogenic province, SW China
Wei Terry Chen;  Mei-Fu Zhou;  Jian-Feng Gao;  Ruizhong Hu
2015
Source PublicationMineralium Deposita
Volume50Issue:7Pages:795-809
Abstract

Fe-Cu deposits in the Kangdian Fe-Cu metallogenic province, SW China, are hosted in Paleoproterozoic meta-volcanic-sedimentary sequences and are spatially associated with coeval mafic intrusions. Several well-known examples are the giant Lala, Dahongshan, and Yinachang deposits. They have a common paragenetic sequence of an early Fe-oxide stage associated with sodic alteration and a late Cu-sulfide stage associated with potassiccarbonate alteration. Magnetite dominates the Fe-oxide stage of these deposits but is also present in the Cu-sulfide stage of the Lala deposit. This study uses trace element compositions of magnetite to examine the nature and origin of the oreforming fluids. The magnetite has variable concentrations of Ti, Al, Mg, Mn, Si, V, Cr, Ca, Co, Ni, Sc, Zn, Cu, Mo, Sn, and Ga, which are thought to have been controlled mainly by fluid compositions and/or intensive parameters (e.g., temperature and oxygen fugacity (fO2)). Fluid-rock interaction and coprecipitating mineral phases appear to be less important in controlling the magnetite compositions. Magnetite grains in the Fe-oxide stage of the Lala and Dahongshan deposits have comparable trace element compositions and were likely precipitated from chemically similar fluids. High Ni contents of magnetite in both deposits, coupled with previous isotopic data and the fact that the two deposits are spatially associated with coeval mafic intrusions, strongly suggest that the oreforming fluids were genetically related to the mafic magmas that formed the intrusions. Magnetite grains in the Fe-oxide stage of the Yinachang deposit have much lower V and Ni but higher Sn and Mo contents than those of the Lala and Dahongshan deposits and are thus thought to have precipitated from more oxidized and Mo-Sn-rich fluids that may have evolved from relatively felsic magmas. Magnetite grains from the Cu-sulfide and Fe-oxide stages of the Lala deposit are broadly similar in composition, but those in the Cu-sulfide stage have slightly higher Cu, Zn, and Mn and are thought to have crystallized from relatively low-temperature and CuZn-Mn-rich fluids evolved from the fluids of the early Feoxide stage. Our results show that magnetite from the Fe-Cu deposits in the Kangdian Province, banded iron formation, Fe skarn deposits, diabase-hosted hydrothermal Fe deposits, and magmatic deposits has significantly different compositions. We propose that covariations of Co-Ni, Zn-Sn, and Co/NiMn can be used to effectively discriminate different deposit types.

KeywordMagnetite Trace Element Composition La-icp-ms Iocg Deposit Kangdian Metallogenic Province,Sw China
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8132
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, 550002 Guiyang, China
2.Department of Earth Sciences, University of Hong Kong, Pokfulam Road, Hong Kong, China
3.State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China
Recommended Citation
GB/T 7714
Wei Terry Chen;Mei-Fu Zhou;Jian-Feng Gao;Ruizhong Hu. Geochemistry of magnetite from Fe-Cu deposits in the Kangdian metallogenic province, SW China[J]. Mineralium Deposita,2015,50(7):795-809.
APA Wei Terry Chen;Mei-Fu Zhou;Jian-Feng Gao;Ruizhong Hu.(2015).Geochemistry of magnetite from Fe-Cu deposits in the Kangdian metallogenic province, SW China.Mineralium Deposita,50(7),795-809.
MLA Wei Terry Chen;Mei-Fu Zhou;Jian-Feng Gao;Ruizhong Hu."Geochemistry of magnetite from Fe-Cu deposits in the Kangdian metallogenic province, SW China".Mineralium Deposita 50.7(2015):795-809.
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