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Mineralogy and Mineral Chemistry of the Cretaceous duolong Gold-Rich Porphyry Copper Deposit in the Bangongco Arc,Northern Tibet

Mineralogy and Mineral Chemistry of the Cretaceous Duolong G...

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： Jinxiang LI Guangming LI Kezhang QIN Bo XIAO Lei CHEN Junxing ZHAO Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences

The Early Cretaceous duolong gold-rich porphyry copper deposit is a newly discovered deposit with proven 5.38 Mt Cu resources of 0.72% Cu and 411 gold of 0.23 g t in northern *** porphyry and quartz diorite porphyrite are the main ore-bearing porphyries.A wide range of hydrothermal alteration associated with these porphyries is divided into potassic,argillic and propylitic zones from the ore-bearing porphyry center outward and *** the hydrothermal alteration zones,secondary albite(91.5-99.7% Ab) occurs along the rim of plagioclase phenocryst and *** K-feldspar(75.1-96.9% Or) replaces plagioclase phenocryst and matrix or occurs in *** occurs mainly as matrix and veinlet in addition to phenocryst in the potassic *** biotite are Mg-rich and formed under a highly oxidized condition at temperatures ranging from 400℃ to 430℃ .All the biotites are absent in F,and have high Cl content(0.19-0.26% ),with log(X/X) values of -2.74 to -2.88 and IV(Cl) values of—3.48 to—3.35,suggesting a significant role of chloride complexes (CuCl and AuCl) in transporting and precipitating copper and *** are present in all alteration zones and correspond mainly to *** have similar Fe/(Fe+Mg),Mn/(Mn+Mg) ratios,and a formation temperature range of 280-360℃ .However,the formation temperature of chlorite in the quartzgypsurn -carbonate-chlorite vein is between 190℃ and 220℃ ,indicating that it may have resulted from a later stage of hydrothermal ***/Fe ratios of chlorites have negative correlation with AP,suggesting oxygen fugacity of fluids increases with decreasing *** mineral inclusions in the biotite phenocrysts show high SO content(0.44-0.82% ) and high Cl content(1-1.37% ),indicating the host magma had a high oxidation state and was enriched in S and *** highest Cl content of apatite in the propylitic zone may have resulted from pressure decrease,and the lowest Cl content of apatite in t

关键词： Bangongco arc duolong gold-rich porphyry copper deposit mineral chemistry mineralogy

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Magmatic-hydrothermal evolution of the Cretaceous duolong gold-rich porphyry copper deposit in the Bangongco metallogenic belt,Tibet:Evidence from U-Pb and 40Ar/39Ar geochronology

Magmatic-hydrothermal evolution of the Cretaceous Duolong go...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Jinxiang Li~*,Kezhang Qin~*,Guangming Li~*,Bo Xiao,Junxing Zhao,Lei Chen Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,PR China

The duolong gold-rich porphyry copper deposit was recently discovered and represents a giant prospect (inferred resources of 4-5 Mt fine-Cu with a grade of 0.72%Cu;30-50t fine-gold with a grade of 0.23 g/t Au) in the Bangongco metallogenic belt,*** SHRIMP and LA-ICP-MS U-Pb geochronology shows that the multiple porphyritic intrusions were emplaced during two episodes,the first at about 121 Ma (Bolong mineralized granodiorite porphyry(BMGP) and barren granodiorite porphyry(BGP)) and the second about 116 Ma(Duobuza mineralized granodiorite porphyry(DMGP)).Moreover,the basaltic andesites also have two episodes at about 118 Ma and 106 Ma,*** andesite yields an U-Pb zircon age of 111.9±1.9 Ma,indicating it formed after the multiple granodiorite *** contrast, the Ar/Ar age of 115.2±1.1 Ma(hydrothermal K-feldspar vein hosted in DMGP) reveals the close temporal relationship of ore-bearing potassic alteration to the emplacement of the *** sericite from quartz-sericite vein(hosted in DMGP) yields a Ar/Ar age of 115.2±1.2 ***,the ore-forming magmatic-hydrothermal evolution probably persisted for 6 ***,the zircon U-Pb ages(106-121 Ma) of the volcanic rocks and the porphyries suggest that the Neo-Tethys Ocean was still subducting northward during the Early Cretaceous.

关键词： Gold-rich porphyry copper deposit Zircon U-Pb geochronology 40Ar/39Ar geochronology duolong Bangongco metallogenic belt Tibet

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