首页|Ore-forming mechanism of Huxu Au-dominated polymetallic deposit in the Dongxiang Basin,South China:Constraints from in-situ trace elements and S-Pb isotopes of pyrite
Ore-forming mechanism of Huxu Au-dominated polymetallic deposit in the Dongxiang Basin,South China:Constraints from in-situ trace elements and S-Pb isotopes of pyrite
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Ore-forming mechanism of Huxu Au-dominated polymetallic deposit in the Dongxiang Basin,South China:Constraints from in-situ trace elements and S-Pb isotopes of pyrite
The Huxu Au-dominated polymetallic deposit is a hydrothermal deposit located in the Dongxiang volcanic basin in the middle section of the Gan-Hang tectonic belt in South China.The orebodies primarily occur within the Jurassic-Cretaceous quartz diorite porphyry,while the gen-esis of this deposit is unclear.This study focused on geologi-cal and mineralogical characteristics,in-situ trace elements and S-Pb isotopes of three generations of pyrite of the Huxu deposit to clarify the distribution of trace elements in pyrite,ore-forming fluid and material sources,and genetic types of the deposit.The mineralization stage of the deposit can be divided into quartz-pyrite stage(S1),quartz-pyrite-hema-tite stage(S2),quartz-polymetallic sulfide stage(S3)and quartz-hematite stage(S4),with the corresponding pyrite being divided into three generations(Py 1-Py3).in-situ trace element data of pyrite show that Au in pyrite mainly exists in the form of solid solution(Au+),and the content is rela-tively low at all stages(0.18 ppm for Py 1,0.32 ppm for Py2,0.68 ppm for Py3),while Pb and Zn mainly exist as sulfide inclusions in the pyrite.S-Pb isotopes show that the sulfur and ore-forming material of this deposit are mainly sourced from magma.The mineral association,mineral textures and trace elements in different stages of pyrite indicate that fluid boiling and fluid mixing are the key factors of native gold precipitation in S2 and S4,respectively,while water-rock interaction controlled the precipitation of Pb-Zn sulfides.These integrating with geological characteristics suggests that the deposit should be an intermediate sulfidation epi-thermal deposit.
Au-dominatedPolymetallic depositIntermediate sulfidationEpithermal depositPyriteTrace elementS-Pb isotopeTectonic belt
Hongze Gao、Jiajie Chen、Chengbiao Leng、Yuhui Hu、Huidan Xie、Zenghua Li
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State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China
National Key Laboratory of Prospecting,Mining and Remote Sense Detecting on Uranium Resources,Nanchang 330013,China
School of Earth Sciences,East China University of Technology,Nanchang 330013,China
Au-dominated Polymetallic deposit Intermediate sulfidation Epithermal deposit Pyrite Trace element S-Pb isotope Tectonic belt
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维普
