摘要
本文依据37个硫同位素及20个铅同位素数据,结合矿床产出的地质环境,利用各种环境中同位素参数类比,讨论了内蒙占东升庙多金属硫化物矿床中矿质的来源。
Located in the western Inner Mongolia.The Dongshengmiao strata- bound polymetallic sulfide ore is a large-scale dposits.The orebodies occur in metamorphic rocks of greenschist pacies of middle proteogeic Zhaertai Group.The main orebodiest exist in the Upper Zenglongchang Group and the Agulugou Group.The shapes of the orebodies are bedded and lentcular their occurrence being in line with those of the wall- rocks.The ore minerals include Pyrite,Pyrrhotite,sphalerite and galena. The granularity of most sulfide is very fine and the main ore structure are hands,which indicate their origin is depositional.But various of deformed brecciated structures,such as little complex folds in dep- osits and the recryslallivation of pyrite have proven that the deposits have been reformed by the later metapnorphose. By studing the geological features of the deposit comparing the value of δ^(34)s of the minerals from the deposit,with those of δ^(34)s fr- om some typical deposits it can be concluded that the element sulfur of the deposits are mainly sulfates of the sea water. Furthermore,by comparing the value of lead isotope and the value of u、v、w、k with those of the upper mantle and the lower crust it can be alse concluded that the main source of the metal compoaition of the deposits are form the upper mantle,and the lower crust.
