中文摘要：

湘西花垣地区铅锌矿床是铅锌矿资源储量超过千万吨的世界级超大型矿床之一。对该矿床主矿化期的方解石和闪锌矿进行了系统的C、H、O同位素研究。分析结果显示，花垣地区铅锌矿床主成矿期方解石样品的δ13CPDB值范围为-2.71‰~1.21‰，δ18OSMOW值范围为16.09‰~22.48‰，团结、李梅、土地坪、蜂塘和大石沟各铅锌矿床中主成矿期方解石的13C、18O同位素依次表现出逐渐降低的特征，在δ18OSMOW-δ13CPDB图上主要介于原生碳酸盐岩与海相碳酸盐岩之间，该地区铅锌矿床成矿流体中的碳主要来源于海相碳酸盐岩的溶解作用。花垣矿区围岩的δ13CPDB值范围为0.15‰~1.17‰，δ18OSMOW值范围为19.79‰~23.89‰，指示沉积成因海相碳酸盐岩的特征。方解石和闪锌矿样品中流体的δDSMOW变化于-91.1‰~-15‰之间，δ18Ofluid变化范围为-4.1‰~9.25‰，在矿区范围内流体的迁移方向是由北向南，δ18Ofluid-δDSMOW图显示，矿床成矿流体的主要来源是建造水和大气降水。成矿流体与围岩间的水-岩反应是导致湘西花垣地区铅锌矿床中方解石和闪锌矿矿物发生沉淀的主要机制。

英文摘要：

With more than ten million tons of lead and zinc resource reserves,the Huayuan lead-zinc deposit is expected to becomethe largest Pb-Zn deposit in China and one of the world-class superlarge ore deposits.In this paper,researches on carbon,hydrogen,oxygen isotope of calcite and sphalerite from the Huayuan lead-zinc deposit formed during the main mineralization period are report?ed.The analytical results show thatδ13CPDB values of calcite samples display the range from2.71‰to1.21‰,theδ18OSMOW valuesare in the range from16.09‰to22.48‰.Theδ13CPDB andδ18OSMOW isotope values of calcite minerals from the Tuanjie,Limei,Tu?diping,Fengtang and Dashigou lead-zinc deposits are gradually reduced in turn,falling between native carbonate rock and marinecarbonate in theδ18OSMOW-δ13CPDB diagram.In the Huayuan lead-zinc deposit,the carbon in the ore-forming fluid was mainly derived from marine carbonate dissolution.Theδ13CPDB values of surrounding rocks in the Huayuan lead-zinc deposit vary from0.15‰to1.17‰,theδ18OSMOW values vary from19.79‰to23.89‰,and the surrounding rock is sedimentary marine carbonate.TheδDSMOW values of fluid in calcite and sphalerite vary from91.1‰to15‰,theδ18O fluid vary from-4.1‰to9.25‰,and the migra?tion direction of fluid in the ore district was from north to south.Theδ18Ofluid-δDSMOW diagram shows that the main source of oreformingfluid was formation water and atmospheric precipitation.Water-rock reaction between ore-forming fluid and wall rock wasthe main mechanism leading to the precipitation and crystallization of calcite and sphalerite in the Huayuan Pb-Zn deposit of westernHu'nan Province.