摘要
山门银矿为一受依兰—伊通深断裂控制的浅成低温热液矿床。该矿床形成于拉张环境下富碱质岩浆活动期后,成矿物质来源于下地壳与上地幔的混合岩浆源区。区域地球化学丰度值Ag/Au比等于60,利于成矿作用的长英质岩浆活动等因素,经深断裂反复活动,成岩期后碱—硅质交代促使以Ag为主的成矿元素的活化迁移。构造空间与矿体上下盘岩性差异形成的地球化学障,是矿质沉淀的良好场区。依据地质环境和成矿物质来源,认为山门银矿床成因类型属深源岩浆热液矿床。
The Shanmen silver deposit is referred to shallow-seated epithermal type, and was formed with the condition of tensile stress after the activity of alkali—rich magma. It is controlled by the Yilan—Yitong deep—seated fault. The metallogenic materials are derived from the mixed magmatic source of the lower crust—upper mantle. Ratio Ag/Au of regional geochemical abundance value is equal to 60.Felsic magma for contributing to metallogenic frequent activities of the deep—seated fault,and post—diagenetic alkaline—siliceous replacement resulted in remobization of the metallogenic elements dominated by silver. The geochemical barrier was formed by the lithological difference of structional setting and hanging and foot wall of the ore body providing of timum area for precipitation of metallogenic materials. It is believed that the genetic type belongs to typhonic magmatic hydrothermal type according to the geological environment and diagenetic material sources.
出处
《吉林地质》
1992年第1期10-19,共10页
Jilin Geology
关键词
银矿
矿床
成矿
深源岩浆热液
Deep—seated fault Typhonic geological body Alkalic replacment Geochemical signature Typhonic magmatic hydrotherm