摘要
纳如松多银铅矿是西藏陆陆碰撞主碰撞时期形成的特殊的隐爆角砾岩型富银富铅矿床。对该银铅矿的主要金属硫化物和矿区的斑岩进行了S、Pb同位素组成的分析和示踪讨论,结果显示矿床的金属硫化物和斑岩(细斑和粗斑)具有一致的铅同位素组成,以富集放射性成因铅为特征,表明成矿物质中的铅主要来源于矿区斑岩。方铅矿的δ34S为2.5‰～4.7‰,与之成对的闪锌矿δ34S为4.5‰～5.5‰,皆大于相对应的方铅矿,表明成矿期的S同位素基本达到了平衡。矿石硫化物硫同位素与粗斑斑岩硫同位素组成更为接近,结合Pb同位素的特征,认为银铅矿的成矿与粗斑斑岩的关系更为密切。
The Narusongduo deposit formed in the medium phase of the main Indian-Tibetan collision.In this paper,S and Pb isotopic data for porphyries and sulfide in the Narusongduo deposit were given.The uniform Pb isotope compositions for the porphyries and sulfide imply that the Pb isotopes may have the same origin,suggesting ore from porphyries in the deposit district.The 34S values for galenite vary from 2.5‰ to 4.7‰ and the 34S values for sphalerite vary from 4.5‰ to 5.5‰.The sulfur isotope fractionation in the ore fluid almost reaches equilibrium.The S isotope compositions from sulfide are similar to those from coarse-crystaline porphyries.The sulfur and lead isotopic features of porphyries and ore minerals from the Narusongduo Silver-Lead Deposit deposit suggest that ore-forming materials are mainly from coarse-crystaline porphyries.
出处
《矿物学报》
CAS
CSCD
北大核心
2010年第3期311-318,共8页
Acta Mineralogica Sinica
基金
国家科技支撑计划项目(编号:2006BAB01A00)
关键词
冈底斯
斑岩
银铅矿
硫同位素
铅同位素
纳如松多
Gangdese
porphyry
Silver-Lead deposit
sulfur isotope
lead isotope
Narusongduo
