摘要
岩房湾铅锌矿位于陕西省太白县境内。文章通过矿床的成矿流体及地球化学特征研究,对比同属于风太矿田的八方山—二里河、铅硐山、银母寺等大型铅锌矿,认为岩房湾铅锌矿床成矿流体为中-低盐度、中-低温、含有CO2,N2,CH4等气体的还原性流体体系,并显示出热卤水成因特点。流体包裹体主要包括水溶液包裹体、CO2-H2O-NaCl包裹体、纯CO2包裹体3种类型,为不混溶包裹体群,均一温度高于八方山—二里河等铅锌矿,可能与西坝岩体的侵入有关。氢、氧同位素特征显示成矿流体为岩浆水与变质水的混合,碳、氧同位素特征显示成矿过程中碳质来源于泥盆纪正常海相碳酸盐岩,铅同位素特征显示出造山带与上地壳混合来源的特点。岩房湾铅锌矿成矿流体和同位素特征与同区大型SEDEX型铅锌矿存在着一些差异,不宜笼统将其与同区热水沉积成因大型铅锌矿床归为同一类型。
Yanefangwan Pb-Zn deposit is a small Pb-Zn deposit of Fengtai ore-deposit-cluster area in Taibai county, Shaanxi Province and a few geological works have been done. Ore fluid of Yanfangwan PbZn deposit is in medium-low temperature and low salinity and contains CO2, N2, CH4 etc. of the reductive gas system characteristic of hot saline. The fluid inclusions are mainly water solution, CO2-H20-NaC1 and pure CO2, the three kinds of inclusion which are immisible. The homogenization temperature is higher than that of Bafangshan-Erlihe Pb-Zn deposit that may be related to intrusion of Xiba rock body. H, O iso- topic composition is characterized by mixture of magmatie water and metamorphic water, C, O isotopic composition by normal Silurian marine carbonate rock and Pb isotopic composition by mixture of Pb sourced from orogenic belt and that of upper crust. Isotopic characteristics of Yanfangwan Pb-Zn deposit differs obviously from those of large Sedex Pb-Zn deposits in the same area and is inapropriately classified into the hot water sedimentary large Pb-Zn deposit.
出处
《地质找矿论丛》
CAS
CSCD
2013年第1期50-57,共8页
Contributions to Geology and Mineral Resources Research
基金
国家自然科学基金项目(编号:41030423)
中国黄金集团公司科技项目"陕西省太白县双王金矿床地质特征
成矿规律及找矿靶区再研究"联合资助
关键词
岩房湾铅锌矿
流体包裹体
成矿流体
地球化学
凤太矿集区
陕西省
Yanfangwan Pb-Zn deposit
fluid inclusion
ore fluid
geochemistry
Fengtai ore-deposit-cluster area
Shaanxi Province
作者简介
刘必政（1985-），男，硕士，主要从事矿床地球化学研究。通信地址：北京市东城区柳荫公园南街l号，北京金有地质勘查一限责任公司；邮政编码：100011；Email：bizhengl985@l63．com
