CAJ | 학술논문

西藏蒙亚啊铅锌矿床位于冈底斯成矿带东段,矿体主要赋存于上石炭统-下二叠统来姑组碳酸盐岩内的矽卡岩和矽卡岩化大理岩中,近东西向似层状产出.在分析该矿床成矿地质条件的基础上,系统地研究了矿石硫、铅同位素组成特征,探讨了成矿物质来源.研究表明,矿石硫化物的硫同位素组成变化范围较窄,具塔式分布效应,估算得到成矿热液系统的总硫同位素值δ~(34)S_(∑S) 约为5.2‰,具有岩浆硫的特征;矿石铅同位素组成稳定,为正常普通铅,矿石铅来源于早白垩世上地壳物质部分熔融形成的岩浆.
서장몽아아연자광상위우강저사성광대동단,광체주요부존우상석탄통-하이첩통래고조탄산염암내적석잡암화석잡암화대리암중,근동서향사층상산출.재분석해광상성광지질조건적기출상,계통지연구료광석류、연동위소조성특정,탐토료성광물질래원.연구표명,광석류화물적류동위소조성변화범위교착,구탑식분포효응,고산득도성광열액계통적총류동위소치δ~(34)S_(∑S) 약위5.2‰,구유암장류적특정;광석연동위소조성은정,위정상보통연,광석연래원우조백성세상지각물질부분용융형성적암장.
The Mengya'a lead-zinc deposit in Tibet is located in the eastern section of Gangdise metallogenic belt. The ore body mainly occurs as stratoid form in the skarn and skarnization marble of the Middle Carboniferous-Upper Permian Laigu Formation, distributed nearly E-W direction. Based on analysis of the ore-forming geological conditions, this paper studies systematically the composition characteristics of S, Pb isotopes in the ore and discusses the sources of the ore-forming materials. Studies have shown that the composition of S isotope in ore sulfides has a narrow variation range and a tower distributional effects. The δ~(34)S_(∑S) of the ore-forming hydrothermal system is about 5.2‰, which presents a characteristic of sulfur from magmatic origin. The Pb isotopic composition of ore sulfides is stable and the ore lead is ordinary common lead. Ore lead derived from magma, which came from partial melting of the upper crust in Early Cretaceous.