【摘要】 清水塘铅锌矿床位于湖南省祁东县北东部,是一个中型矿床。在详细的野外地质调查基础上,本文通过矿石硫、铅同位素,含矿石英氢、氧同位素和含矿方解石碳、氧同位素等综合研究,探讨清水塘铅锌矿床成矿物质来源和成因。硫同位素研究结果表明,清水塘铅锌矿床中黄铁矿、方铅矿和闪锌矿的硫同位素δ³⁴S介于-7.41‰².91‰之间,重晶石的硫同位素δ³⁴S介于11.49‰¹2.34‰之间,表明矿石中的硫主要来源于深源岩浆,并受到上部地壳物质的混染。黄铁矿、方铅矿和闪锌矿的Pb同位素²⁰⁶Pb/²⁰⁴Pb介于17.810¹8.710之间,²⁰⁷Pb/²⁰⁴Pb介于15.497¹5.726之间,²⁰⁸Pb/²⁰⁴Pb介于37.858³8.834之间;其中闪锌矿变化范围略偏大,表明矿石中的铅主要来源于地壳,可能混有少量地幔物质。含矿石英的氢、氧同位素δD_SMOW介于-87.4‰^-79.3‰之间,δ¹⁸O_H2O介于-8.10‰⁰.63‰之间,表明成矿流体以岩浆水为主,晚期有大气降水的混入。含矿方解石的碳、氧同位素δ¹³C_VPDB介于-5.3‰^-4.6‰之间,δ¹⁸O_SMOW介于12.30‰¹3.48‰之间;与地层灰岩的δ¹³C_VPDB（0.9‰².6‰）,δ¹⁸O_SMOW（21.86‰²3.39‰）不一致;说明成矿流体中的碳主要来自深源岩浆。以上研究表明,清水塘铅锌矿床的成矿物质主要来自地壳熔融形成的岩浆,混合作用是成矿的主要机制。更多还原

【Abstract】 Qingshuitang Pb-Zn deposit,a medium-size deposit,is located in the northeast of Qidong County,Hunan Province.Based on field geological investigation,we carried out the sulfur and lead isotopic compositions of the ores,hydrogen and oxygen isotopic compositions of the ore-bearing quartz,as well as carbon and oxygen isotopic compositions of the ore-bearing calcites and limestone,to discuss the oreforming material source and genesis of the Qingshuitang Pb-Zn deposit.The δ³⁴S values of pyrite,galenite and sphalerite range from-7.41 to 2.91 ‰,and the δ³⁴S values of barite range from 11.49 to 12.34 ‰,indicating a deep source for magma and may be partly contaminated by the crustal substance.The ²⁰⁶Pb/²⁰⁴ Pb,²⁰⁷Pb/²⁰⁴Pb and ²⁰⁸Pb/²⁰⁴Pb ratios for ores range from of 17.810 to 18.710,15.497 to 15.726,37.858 to 38.834,respectively,indicating Pb was mainly derived from crust and may be mixed some mantle source.The δD_SMOW and δ¹⁸O_H2O values of ore-bearing quartz range from-87.4to-79.3‰ and from 8.10 to 0.63‰,respectively,indicating that the ore-forming fluid came mainly from a magmatic hydrothermal source,with meteoric water added in the late mineralization stage.The δ¹³C_VPDB values for limestone in strata range from 0.9 to 2.6‰,the δ¹⁸O_SMOW values range from 21.86 to 23.39 ‰;The δ¹³C_VPDB and the δ¹⁸O_SMOW values of ore-bearing calcites range from-5.3 to-4.6 ‰ and from 12.30 to 13.48‰,respectively,which are not consistent with δ¹³C_PDB（0.9‰ ².6‰）and δ¹⁸O_SMOW（21.86‰ ²3.39 ‰）of the limestone,indicating that carbon in the ore-forming fluid mainly originated from deep magma.The research above shows that the ore-forming materials of the Qingshuitang deposit mainly came from the partial melting of the crust and the mixing effect was the main ore-forming mechanism.更多还原