actinolite schist

Actinolite and pyroxene phenocrysts separated respectively,from chlorite-actinolite schist and altered pillow basalt in the E rou area of the eastern part of the Shuanghu-Longmuco suture zone, yield well-defined ~ 40 Ar/~ 39 Ar plateau ages of 235.

在藏北龙木错—双湖缝合带东段双湖鄂柔地区,获得绿泥阳起石片岩中阳起石矿物的40Ar/39Ar坪年龄为(235·9±2·6)Ma和枕状玄武岩中蚀变辉石斑晶的40Ar/39Ar坪年龄为(232·5±2·4)Ma,两个年龄具有极好的一致性,记录了中三叠世晚期—晚三叠世早期沿龙木错—双湖缝合带发生俯冲碰撞作用的构造-热事件。