摘要
二十一站岩位于黑龙江省西北部,3个相对独立的岩体组成,面积约20.6 km2,主要为中酸性侵入岩,主要岩性为花岗闪长岩、花岗闪长斑岩、英云闪长岩。形成于晚侏罗世同碰撞到碰撞后抬升阶段,蒙古-中朝大陆与西伯利亚大陆同碰撞到后碰撞转换环境,可能是蒙古-鄂霍茨克造山带陆陆碰撞期间加厚下地壳拆沉、部分熔融,并受地幔混染的产物。
The Ershiyizhan Terrene is located in the northwest of Heilongjiang Province, consists of 3 independent rock rel- atively, about 20.6 km2 , mainly intermediate-acid intrusive rocks, the rock is mainly granitediorite, granodiorite porphyry, tor alite. The Ershiyizhan terrene originated from the collision in the late Jurassic epoch stage to the late collision-uplift stage, associating to partial melting of delaminated crust which were thickened by the collisional orogeny between the Siberia and Mongol-Sinokorea continents.
出处
《甘肃冶金》
2013年第2期81-83,88,共4页
Gansu Metallurgy
关键词
构造环境
就位机制
二十一站岩体
黑龙江
structural environment
petrology geochemistry
Ershiyizhan terrene
Heilongjiang
