摘要
根据嫩江—黑河地区古生代地质体岩石组合特征,恢复原岩建造类型,并在分析岩浆作用、变质作用、构造组合关系及同位素年代学资料基础上,探讨嫩江—黑河晚古生代陆陆碰撞带的形成机制。研究认为,早石炭世兴安地块和松嫩地块开始沿嫩江—黑河一线汇聚拼贴,早石炭世洋陆俯冲阶段形成了岛弧与弧后盆地沉积;晚石炭世—早二叠世陆陆碰撞过程中形成花岗闪长岩和二长花岗岩侵位;早二叠世碰撞后伸展阶段形成了中二叠世弧后残余盆地。总体具有从俯冲-碰撞造山向造山后伸展演化的特点。
According to rock assemblage of Paleozoic geological bodies in Nenjiang-Heihe area,the protolith type are restored. On the basis of the analysis of magmatism,metamorphism,tectonic combination and isotopic geochronology data,the formation mechanism of Late Paleozoic continental collision in Nenjiang-Heihe area has been discussed. The results show that Xing'an block and the Songnen block began to converge along the Nenjiang-Heihe line in the Early Carboniferous,and the island arc and post-arc basin were formed in the oceanic crust subduction stage. Emplacement of granodiorites and monzogranites occurred during the Late Carboniferous-Early Permian continent-continent collision. Middle Permian back-arc residual basin formed after the Early Permian post-collisional extension. Generally,the evolution history of the study area was characterized by subduction to collisional orogeny,and to post-orogenic extension.
出处
《世界地质》
CAS
2017年第4期1064-1071,共8页
World Geology
基金
大兴安岭区域地质调查片区总结与服务产品开发项目(DD20160345-17)
1:5万嫩北农场等四幅区调项目(1212010881213)联合资助
关键词
嫩江—黑河地区
晚古生代碰撞
构造建造
Nenjiang-Heihe area
Late Paleozoic collision
Petrologic-tectonic formation response
作者简介
通讯作者：汪岩（1968-）男,教授级高级工程师,主要从事区域地质与火成岩研究工作.E-mail：wy68413@163.com
