皖赣相邻区燕山期花岗岩类构造背景及其意义

对比研究了江南隆起带皖南地区与赣东北地区燕山期花岗岩类形成的构造背景。皖南地区燕山期花岗岩类形成于挤压构造背景,而赣东北地区燕山期花岗岩类形成于拉张向挤压过渡的构造背景;幔源岩浆直接参与到赣东北地区燕山期花岗岩类的成岩作用中,而皖南地区燕山期花岗岩类成岩物质主要为壳源;这种差异是赣东北地区燕山期与岩浆岩有关的多金属矿床发育,而皖南地区不发育的重要原因。

Tectonic setting of granitoids of Yanshanian Stage in the adjoining region of Anhui and Jiangxi Province and Its Significance

The tectonic setting of granitoids of Yanshanian Stage in the south of Anhui Province and the northeast of Jiangxi Province in Jiangnan Uplift is studied.The results show that the granitoids of Yanshanian Stage in the south of Anhui Province were formed in the compressive setting,and the crustal stress of the tectonic setting of granitoids of Yanshanian Stage in the northeast of Jiangxi Province changed from tensile stress to compressive stress.As a result,the magma of mantle participated in the forming of granitoids of Yanshanian Stage in the northeast of Jiangxi Province directly,and the source materials of granitoids of Yanshanian Stage in the south of Anhui Province mainly came from the crust.So the polymetal deposits having relation to the magmatic rocks of Yanshanian Stage in the northeast of Jiangxi Province are rich and those in the south of Anhui Province are poor.