摘要:安徽铜陵桂山铜铅锌矿床是铜陵矿集区沙滩脚矿田内近年来新发现的以铜矿为主，伴生铅锌矿的中小型多金属矿床，该矿床的矿体主要赋存于三叠系南陵湖组灰岩与青山花岗闪长斑岩体接触带附近及花岗闪长斑岩体内。本文在对该矿床地质特征的研究基础上，对代表性（岩）矿石进行碳、氢、氧、硫、铅同位素研究分析，据此约束该矿床的成矿流体和成矿物质来源。研究成果显示， 桂山铜铅锌矿床中方解石样品中δ13CV-PDB 值为?3.2‰～2.0‰ 间，δ18OV-SMOW 为8.3‰～15.2‰ 间，石英流体包裹体水的δDV-SMOW 为?112.6‰～?6.8‰，δ18OV-SMOW 为10.5‰～14.7‰，矿石中硫化物δ34S值变化范围为?0.9‰～4.1‰，具塔式分布特征，矿石铅中的206Pb /204Pb 比值为18.409～18.585，207Pb /204Pb 比值为15.588～15.703，208Pb /204Pb 比值为38.483～38.843，以上指示了桂山铜铅锌矿床的成矿流体主要来源于岩浆水，并有大气降水的加入。分异成矿流体的岩浆可能来源于地幔，且伴有上地壳物质混入的特点。岩浆—地幔的溶解作用，伴有地层中碳质的混入。?
关键词: 桂山铜铅锌矿床/
碳、氢、氧、硫、铅同位素/
成矿流体/
成矿物质来源/
铜陵
Abstract:Guishan Cu-Pb-Zn deposit is a small and medium sized copper and associated with lead-zinc polymetallic deposit, which is newly discovered in Shatanjiao ore field of Tongling ore concentration in recent years. The orebodies of this deposit are mainly found in the Qingshan granite diorite-porphyry, and the contact zone of carbonate rock of Nanlinghu Formation in Triassic with the porphyry body. This paper analyses the characteristics of carbon, hydrogen, oxygen, sulful and lead isotope of the ore, basing on the study of geological characteristics of the deposit, and discuss the source of ore-forming fluid and ore-forming material. The result showing that, the δ13CV-PDB of calcite is between??3.2‰ and 2.0‰, the δ18OV-SMOW is between 8.3‰ and 15.2‰, the δDV-SMOW of the quartz fluid inclusions is between??112.6‰ and??96.8‰, the δ18OV-SMOW is between 10.5‰ and 14.7‰, the δ34S of sulfide in ore is between??0.9‰ and 4.1‰, with the feature of tower distribution, the 206Pb /204Pb of ore is between 18.409 and 18.585, 207Pb/204Pb is between 15.588 and 15.703, 208Pb/204Pb is between 38.483 and 38.843. It reflects that the ore-forming fluid is mainly derived from the magmatic water and a few of which come from the addition of atmospheric precipitation. The magma which produces ore-forming fluid by differentiation is from mantle, and associated with substance of the upper crust. The dissolution of magma and mantle is accompanied by the mixing in carbon from the stratum.?
Key words:Guishan Cu-Pb-Zn deposit/
Carbon/
Hydrogen/
Oxygen/
Sulful and lead isotope
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