现代地质Issue(1)：29-41,13.
湘西-黔东下寒武统铅锌矿床流体包裹体和硫、铅、碳同位素地球化学特征
Fluid Inclusions and S,Pb,C Isotope Geochemistry of Pb-Zn Deposits Hosted by Lower Cambrian in Western Hunan-Eastern Guizhou Area
摘要
Abstract
The western Hunan-eastern Guizhou area is an important Pb-Zn polymetallic ore district,some of which hosted in the algal limestone of the Lower Cambrian Qingxudong Formation.In this study,fluid inclusions and S,Pb,C isotope compositions were studied for four typical Pb-Zn deposits (Limei,Shizishan,Xiunao and Pukouchang)hosted in the Qingxudong Formation.The results show the ore-forming fluid with low temperature and medium to high salinity.The δ34 S values of sulfides are high.The δ1 3 C and δ1 8 OV-SMOW values of wall-rock and calcite show the same characteristic with the normal marine carbonate.The Pb isotope of the wall-rocks and ore have a little variation scope,showing the linear distribution in the 207 Pb/204 Pb -206 Pb/204 Pb diagram.Our results indicated that ore-forming materials of the Pb-Zn deposits in the western Hunan-eastern Guizhou area mostly derived from the carbonate wall-rocks.Meanwhile,migrating fluid added Pb,Zn materials to the depo-sits as well.Pb,Zn and associated minerals were precipitated due to the changes of the physical and chemical conditions,resulted from mixing of two sources,indicating that the genesis type of our studied deposits is the Mississippi Valley-type (MVT)lead-zinc deposit.关键词
清虚洞组/MVT矿床/同位素/流体包裹体/湘西-黔东Key words
Qingxudong Formation/Mississippi Valley-type deposit/isotope/fluid inclusion/western Hunan-eastern Guizhou分类
天文与地球科学引用本文复制引用
蔡应雄,杨红梅,段瑞春,卢山松,张利国,刘重秡,邱啸飞..湘西-黔东下寒武统铅锌矿床流体包裹体和硫、铅、碳同位素地球化学特征[J].现代地质,2014,(1):29-41,13.基金项目
国土资源部公益性行业科研专项“湘西-鄂西典型铅锌矿床同位素定年方法与应用示范研究”（201011027-3）；中国地质调查局项目“中南地区重大地质事件同位素年代学研究”（1212011121102）。 （）
