内蒙古孟恩陶勒盖银铅锌铟矿床成因研究  

Genesis of Meng'entaolegai Ag-Pb-Zn-In Polymetallic Deposit in Inner Mongolia

作　　者：朱笑青[1] 张乾[1] 何玉良[1] 邵树勋[1] 

机构地区：[1]中国科学院地球化学研究所,矿床地球化学重点实验室,贵州贵阳550002

出　　处：《矿床地质》2004年第1期52-60,共9页Mineral Deposits

基　　金：国家自然科学基金项目 (批准号 :4 0 1 72 0 37)的资助

摘　　要：文章从地质特征及地球化学特征方面论证了孟恩陶勒盖矿床的成因。地质特征显示该矿床的形成与花岗岩之间不存在成因联系 ,矿床相对于岩浆岩围岩是后成的 ,花岗岩及断裂构造只是为矿床提供了储存空间。矿床地球化学特征显示该矿床的成因与可能位于深部的燕山期岩浆活动有关 ,成矿元素及硫主要来自岩浆 ,成矿流体以岩浆水为主。因此该矿床属于岩浆热液型多金属矿床。The Meng'entaolegai polymetallic deposit located in the center of a granitic bat holith is controlled by EW_trending faults. The major useful elements of the dep osit are silver, lead and zinc, with rich indium, tin and cadmium. Its geologica l characteristics show that there exists no genetic correlation between the depo sit and the granites. The deposit was formed later than the granites. The granit es and faults provided only room for the orebodies. The δ 34 S values are - 1.7‰ to +4.6‰, indicating that sulfur was derived from the magmatism. The ore_ forming fluid must have come from the magmatic differentiation in the light of t he H_O isotopic compositions. The lead isotopic compositions of all related rock s and ores indicate that lead in ores has no relationship with the Hercynian gra nite, the Yanshanian granite and the Precambrian basement metamorphic rocks, and it has the same source as sulfur. Although the geological features of the depos it are somewhat similar to those of the orogen_type deposits, its geochemical fe atures imply that its origin is related to other deep_seated magmatism. During t he mineralization, the Huolinhe regional fault acted as the channel for the migr ation of ore_forming fluids from the depth, and the EW_trending faults served as room for the settling of orebodies.

关 键 词：银铅锌铟矿床 矿床成因 地质特征 地球化学 内蒙古 

分 类 号：P618.4[天文地球—矿床学] P618.82[天文地球—地质学]