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Source of ore-forming materials in laowangzhai gold deposit, Yunnan. Evidence from lead isotopic composition

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Chinese Science Bulletin 1999年第S2期44卷 248-250页

作者： LI Yuan~1, XIAO Huayun~2, HUANG Zhilong~2, HAN Runsheng~1 and LIU Congqiang~2 1. Kunming University of Science and Technology, Kunming 650093, China 2. Institute of Geochemistry, Chinses Academy of Sciences, Guiyang 550002, China Kunming University of Science and Technology Kunming 650093 China Institute of Geochemistry Chinses Academy of Sciences Guiyang 550002 China

THE laowangzhai superlarge gold deposit was found in 1984. Although studies on regional structure, geology of deposits and lamprophyres, which are temporally and spatially related to gold mineralization,have been carried out, the views on the source of ore-forming materials have been different. Thisnote summarized the characteristics of lead isotopic composition of the deposits, and probed further intothe source of ore-forming materials. 1 Geological setting The laowangzhai gold deposit, located in the north of the Ailaoshan fault zone, consists of Donggualin and laowangzhai ore block. The strata in the orefield include Paleozoic （Pz3） epimetamorphic ma-

关键词： lead isotopic composition source of ore-forming materials laowangzhai gold deposit.

GEOCHEMISTRY OF LAMPROPHYRES IN THE laowangzhai GOLD DEPOSITS,YUNNAN

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Geotectonica et Metallogenia 1997年第Z1期21卷 56-65页

作者： HUANG Zhilong WANG Liankui ZHU Chengming (Institute of Geochemistry, Academia Sinica, Guiyang, 550002, China) (Guangzhou Institute of Geochemistry, Academia Sinica, Guangzhou, 510640, China)

This paper systematically reports geochemical data of lamprophyres which are temporally andspatially related to Au mineralization in the laowangzhai gold deposits, Yunnan Province. Majorelements show that lamprophyres in the orefield are alkalic series and potassic calc-alkaline lam-prophyres. Chondrite-normalized transition element patterns of the lamprophyres are "W" shapedwhich suggest that the rocks are mantle-derived. The lamprophyres are enriched in large ionlithophile elements (LlLE ), high field strength elements (HFSE ) and rare earth elements(REE), and have high 87Sr/86Sr but low 143Nd/144Nd ratios. All the characteristics above and cal-culation modelling suggest that the source of the lamprophyres is incompatible element-enrichedmetasomatic mantle.

关键词： lamprophyre the laowangzhai gold deposits Yunnan

Emplacement age and PGE geochemistry of lamprophyres in the laowangzhai gold deposit,Yunnan,SW China

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Science China Earth Sciences 2001年第S1期44卷 146-154页

作者：王江海漆亮尹安解广轰

Widely-distributed lamprophyres in the laowangzhai gold deposit were associated closely with gold ores. Phlogopite ^(40)Ar/^(39)Ar dating suggests that the emplacement age of lampro-phyric magma ranges from (30.8±0.4) to (34.3±0.2) Ma, and gold mineralization took place at (26.4±0.2) Ma. PGE geochemical tracing indicates that gold in the gold deposit did not come from the primitive lamprophyric magma. The tempo-spatial paragenesis between lamprophyres and mesothermal gold deposits along the Jinsha-Red River belt may be attributed to the fact that they formed in the same tectonic setting.

关键词： thermochronology PGE geochemistry lamprophyre laowangzhai gold deposit Yunnan.