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对花岗岩类中长石族矿物的研究,不仅有助于花岗岩类的成因和演化规律的探讨,而且对确定岩体时代也有一定的意义。 我们研究的样品,采自西藏南部的冈底斯岩带、拉轨岗日岩带和喜马拉雅岩带;时代从燕山晚期到喜马拉雅期均有。根据岩体的地质产状和同位素地质年龄测定结果,属于燕山晚期第一阶段(Ⅰ.γ_5~(3-1))侵入岩的有闪长岩、花岗闪长岩类;第二阶段(Ⅱ.γ_5~(3-2))为斑状
The study of feldspar minerals in granites not only contributes to the discussion of the genesis and evolution of granites, but also has certain significance in determining the age of the rock mass. The samples we studied were collected from the Gangdise rock belt, the Razan Kongrada belt and the Himalayan rock belt in the south of Tibet. The ages were from late Yanshanian to Himalayan. According to the geologic status and isotopic geochronology of the rock mass, it belongs to the diorite and granodiorite in the first stage of Late Yanshanian (Ⅰ.γ_5 ~ (3-1)) intrusive rocks. In the second stage ( Ⅱ.γ_5 ~ (3-2)) is a patchy