摘要
栖霞山铅锌矿位于长江中下游成矿带东部,是我国东部最大的铅锌矿床。通过矿区接替资源勘查,在深部取得重大突破,主矿体控制深度由-650 m延深至-1079 m,且在深部发现了绿帘石、透闪石、透辉石等矽卡岩蚀变矿物。结合最新成果,从控矿地质因素、矿体地质、成矿元素的空间分带特征等入手,全面总结了矿床地质特征。通过分析黄铁矿、闪锌矿、方铅矿、黄铜矿中S同位素组成,发现黄铁矿中的硫来源于沉积岩和岩浆,而闪锌矿、方铅矿和黄铜矿中的硫来源于岩浆;硫化物中Pb同位素的分布特征指示矿石铅主要来源于上地壳与地幔混合;碳酸盐矿物C、O同位素组成反映成矿流体与岩浆热液的亲缘关系;H、O同位素特征反映成矿流体主要为深部岩浆期后热液,并有大气水的加入。综合地质与同位素地球化学研究成果,对栖霞山铅锌矿床的成因进行了探讨。
Located in the eastern part of the middle and lower reaches of the Yangtze River,the Qixiashan lead-zinc deposit is the largest of its kind in eastern China.The subsequent prospecting has achieved major breakthrough in its deeper areas.The main ore body controlling depth was extended from-650 m to-1079 m,and skarn-altered minerals such as epidote,tremolite and diopside were found in the deep.Combined with the latest achievements,the geological characteristics of the deposits were comprehensively summarized from the aspects of ore-controlling geological factors,ore body geology,and spatial zoning characteristics of metallogenic elements.By analyzing the composition of sulfur isotopes in pyrite,sphalerite,galena,and chalcopyrite,it is found that the sulfur in pyrite is derived from sedimentary rocks and magma,while in sphalerite,galena and chalcopyrite,sulfur is derived from magma;the distribution characteristics of lead isotope in sulfide indicate that the ore lead is mainly derived from the upper crust and mantle;the carbon and oxygen isotope composition of carbonate minerals reflects the relationship between ore-forming fluid and magmatic hydrothermal fluid;hydrogen and oxygen isotope characteristics reflect that the ore-forming fluid is mainly hydrothermal after the deep magma period,with the addition of atmospheric water.Based on comprehensive geological and isotope geochemical research results,the paper explored the genesis of the Qixiashan lead-zinc deposit.
作者
魏新良
景山
孙学娟
Wei Xinliang;Jing Shan;Sun Xuejuan(East China Mineral Exploration and Developm ent B ureau,Nanjing 210007,Jiangsu,China)
出处
《地质学刊》
CAS
2019年第4期573-583,共11页
Journal of Geology
基金
中国地质调查局项目“老矿山深部和外围找矿:江苏省南京市栖霞山铅锌矿接替资源勘查”(1212011220678)
关键词
铅锌矿
矿床特征
成因
南京栖霞山
lead-zinc deposit
characteristic of deposit
genesis
Qixiashan,Nanjing
