Geology and Geochemistry of K-feldspar Veins in Lamprophyre at the Zhenyuan Gold Deposit,Yunnan,Southwest China:Implications for Gold MineralizationOACSTPCD
Geology and Geochemistry of K-feldspar Veins in Lamprophyre at the Zhenyuan Gold Deposit,Yunnan,Southwest China:Implications for Gold Mineralization
Lamprophyres typically appear in hydrothermal gold deposits.The relationship between lamprophyres and gold deposits is investigated widely.Some researchers suggest that the emplacement of lamprophyres triggers gold mineralization,whereas others hypothesize that the formation of lamprophyres increases the fertility of mantle sources and ore-forming fluids.K-feldspar veins,with ages between those of lamprophyres and gold deposits,appear in lamprophyres in Zhenyuan.Therefore,K-feldspar veins are ideal for investigating the relationship between lamprophyres and gold deposits.Phlogopite in K-feldspar veins has lower Mg#,Ni,and Cr contents and higher TiO2,Li,Ba,Sr,Sc,Zr,Nb,and Cs contents than phlogopite in lamprophyres.The in-situ Sr isotopic values of apatites(0.7063-0.7066)in K-feldspar veins are within the range for apatites(0.7064-0.7078)from lamprophyres.High large-ion lithophile element concentrations and low Nb and Ta concentrations in phlogopite from lamprophyres,in addition to high(87Sr/86Sr)i values of apatite(0.7064-0.7078),indicate that the magma parental to these phlogopite and apatite crystals is derived from an enriched mantle.K-feldspar veins are genetically correlated with lamprophyres,whereas sulfide mineral assemblage and trace element compositions of pyrite in K-feldspar veins suggest that K-feldspar veins in lamprophyres are not directly related to gold mineralization of the Zhenyuan deposit.
ZHANG Huichao;CHAI Peng;ZHANG Hongrui;ZHOU Limin;HOU Zengqian
Key Laboratory of Submarine Geosciences,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China||Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China||Key Laboratory of Marine Hazards Forecasting,Ministry of Natural Resources,Hohai University,Nanjing 210024,ChinaInstitute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,ChinaNational Research Center for Geoanalysis,Beijing 100037,China
lamprophyreK-feldspar veinapatite Sr isotopegoldZhenyuan depositYunnan
《地质学报（英文版）》 2024 (001)
104-116 / 13
This research was supported by the National Natural Science Foundation of China(Grant No.41973045),Basic Science and Technology Research Funding of the CAGS(Grant No.JKYZD202312),the National Key Research and Development Project of China(Grant No.2022YFF0800903),National Natural Science Foundation of China(Grant Nos.41802113,42073053,42273073 and 42261144669).We are grateful to the journal's editors and two anonymous reviewers for their critical comments and suggestions.Discussion with Prof.Nigel J.Cook(University of Adelaide,Australia)improves the quality of this paper.Dr.Li Xiaoli kindly assisted with EPMA operation.Dr.Sarah Gilbert(University of Adelaide,Australia)helped me to maintain operation in LA-ICP-MS experiments for the pyrite.Li Liang provided assistance during the LA-ICP-MS analysis for mineral trace element contents.
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