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REE and C-O Isotopic Geochemistry of calcites from the World-class Huize Pb-Zn Deposits,Yunnan,China:Implications for the Ore Genesis

引用

Acta Geologica Sinica(English Edition) 2010年第3期84卷 597-613页

作者： HUANG Zhilong LI Xiaobiao ZHOU Meifu LI Wenbo JIN Zhongguo State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry the Chinese Academy of Sciences Guiyang 550002 China Department of Earth Sciences University ofHong Kong Hong Kong China Graduate School the Chinese Academy of Sciences Beijing 100039 China MOE Key Laboratory of Orogenic Belts and Crustal Evolution Peking University Beijing 100871 China

The world-class Huize Pb-Zn deposits of Yunnan province,in southwestern China,located in the center of the Sichuan-Yunnan-Guizhou Pb-Zn polymetallic metallogenic province,has Pb＋Zn reserves of more than 5 million tons at Pb＋Zn grade of higher than 25%and contains abundant associated metals,such as Ag,Ge,Cd,and *** deposits are hosted in the Lower Carboniferous carbonate strata and the Permian Emeishan basalts which distributed in the northern and southwestern parts of the *** is the only gangue mineral in the primary ores of the deposits and can be classified into three types,namely lumpy,patch and vein calcites in accordance with their *** is not intercalated contact between calcite and ore minerals and among the three types of calcite,indicating that they are the same ore-forming age with different stages and its forming sequence is from lumpy to patch to vein calcites. This paper presents the rare earth element（REE） and C-O isotopic compositions of calcites in the Huize Pb-Zn *** lumpy to patch to vein calcites,REE contents decrease as LREE/ HREE ratios *** chondrite-normalized REE patterns of the three types of calcites are characterized by LREE-rich shaped,in which the lumpy calcite shows（La）_N〈（Ce）_N〈（Pr）_N≈（Nd）_N with Eu/Eu~＊〈1,the patch calcite has（La）_N〈（Ce）_N〈（Pr）_N≈（Nd）_N with Eu/Eu~＊〉1,and the vein calcite displays（La）_N〉（Ce）_N〉（Pr）_N〉（Nd）_N with Eu/Eu~＊〉*** REE geochemistry of the three types of calcite is different from those of the strata of various age and Permian Emeishan basalt exposed in the ***δ^（13） C_（PDb） andδ^（18）O_（Smow） values of the three types of calcites vary from-3.5‰to-2.1‰and 16.7‰to 18.6‰,respectively,falling within a small field between primary mantle and marine carbonate in theδ^（13）C_（PDb） vsδ^（18）O_（Smow） diagram. Various lines of evidence demonstrate that the three types of calcites in the deposits are produced from the same source with different *** ore-forming f

关键词： gangue calcite REE geochemistry C-O isotope ore-forming fluid Huize Pb-Zn deposits

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