摘要
伊春-延寿花岗岩带上的晚三叠世二长花岗岩体是一套呈结构演化系列的岩石,岩石类型按结构可划分出一期结构、二期结构、末期结构的完整系列.岩石中普遍发育同源闪长岩包体,在岩石学、岩石化学及地球化学方面表现出明显I型花岗岩特征.花岗岩类产出动力学地质背景分析表明其形成于碰撞后构造环境,造山后伸展体制是这期花岗岩形成的重要原因,岩浆就位机制呈现出被动侵位的特点.
The Late Triassic adamellite masses in the Yichun-Yanshou granite zone are a series of rocks with complete texture evolution. According to their textures, the rocks can be divided into types of first stage, second stage and last stage textures. The homoeogene diorite enclaves are broadly developed in the adamellite masses. The rocks show obvious characteristics of Ⅰ-type granite in petrology, petrochemistry and geochemistry. Analysis on the occurring tectonic setting indicates that the granites were generated in the post-collision environment, and the post-orogenic extension system is the main condition for the forming of the granite. The magma emplacement mechanism shows passive characteristics.
出处
《地质与资源》
CAS
2005年第3期170-175,191,共7页
Geology and Resources
关键词
二长花岗岩
成因
就位机制
结构演化
岩石密度
伊春地区
adamellite
genesis
emplacement mechanism
texture evolution
density of rocks
Yichun area
