摘要
本文简要地介绍了上海金山张堰铜矿床的成矿地质特征。鉴于与成矿作用有关的下列地质事实:1.成矿严格受石英闪长岩与金山群角岩系的接触带制约;2.主矿体与矽卡岩关系密切;3.矿体产出部位钾化、碳酸盐化、绿泥石化、硅化等热液蚀变作用比较发育;4.主矿体大多呈透镜状,矿体中主要金属组份分布均匀;5.与成矿有关的张堰石英闪长岩体具有较高的成矿元素背景值;6.成矿的主要金属硫化物矿物的δS34值(0.9‰～4.7‰)显示了硫的岩浆来源。因此,认为张堰铜矿在成因上属接触交代矽卡岩型矿床。
This paper deals with the oregenetic characteristics of Zhangyan copper deposit inJinshan county,Shanghai.The basic oregenetic characteristics are discussed as follows:1.the occurence of mineralization is strictly controlled by the contact zone between quartz-diorite and hornfels of Jinshan group;2.the main ore bodies are closely related to theskarns;3.the hydrothermal alterations,such as potash feldsparization,carbonatization,chlo-ritization,silicification etc.,are developed coincidently in the space of ore bodies;4.themain ore bodies,in which the main metals are distributed evenly,commonly have lensform;5.Zhangyan quartz-diorite related to the mineralization has higher aboundance ofmetallogenic elements;6.the valueof δS34(0.9‰—4.7‰)of the main metallic sulfides den-otes that the sulfer is magmatogene.From above-mentioned facts,the author considerZhangyan copper deposit as contact metasomatic skarn type deposit.
关键词
铜矿床
地质特征
上海
Zhangyan copper deposit
geological characteristics
