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地质学报  2001 

三江地区义敦岛弧碰撞造山过程:花岗岩记录

, PP. 484-497

Keywords: 花岗岩成因类型时间坐标形成背景岛弧碰撞造山过程三江地区岩浆事件

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Abstract:

义敦岛弧碰撞造山带是特提斯-喜马拉雅巨型造山带中的一个复合造山带。本文利用义敦岛弧碰撞造山带29个花岗岩体的43件同位素测年数据,结合岩石地球化学特征,建立了造山带花岗岩的时间坐标。初步识别出4套不同成因类型的花岗岩,即印支期弧花岗岩、燕山早期同碰撞花岗岩、燕山晚期A型花岗岩和喜马拉雅期花岗岩。据此,再造了造山带的形成过程与演化历史:印支期的大规模俯冲造山作用(238-210Ma),形成义敦火山岩浆弧;大约自206Ma始,发生弧-陆碰撞,伴随岛弧地壳挤压收缩和剪切变形,发育同碰撞花岗岩;进入燕山晚期(138-73Ma),岛弧碰撞造山带发生造山后伸展作用,形成A型花岗岩带;喜马拉雅期发生陆内造山作用(65-15Ma),岛弧碰撞造山带出现逆冲-推覆和大规模走滑平移,伴随喜马拉雅期花岗岩的侵位和拉分盆地的形成。

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