北祁连含蓝闪石岩的特征及成因

THE CHARACTERS AND GENESIS OF GLAUCOPH-ANE-BEARING ROCKS IN NORTH QILIAN

本文论述了北祁连含蓝闪石岩的岩石类型、原岩类型、特征矿物组合及产态.区内含蓝闪石岩的原岩包括优地槽内发育的各类富钠火山岩、含富钠火山质的沉积岩。在含蓝闪石岩分布区,岩石的变质相有葡萄石-绿纤石相、蓝闪石—绿片岩相、绿帘石-角闪岩相、铁铝榴石—角闪岩相等,未发现高压低温矿物组合.岩石应属区域动力变质作用产物,并对其形成环境进行了探讨.

:The glaucophane-bearing rock types, and their primary rocks' types, characteristic mineral associations and genesis are described briefby in this paper. The primary rocks include the various sodium-rich volcanic rocks and the sedimentary rocks with sodium-rich volcanic materials which are well developed in the North Qilian eugeosyncline area. In the glaucophane-bearing rocks there distributed some sections, in which the metamorphic facies of the rocks are mainly of prehnite-pumpellyite facies, glaucophane-greenschist facies, and epidote (almandine)-amphibolite facies etc, but the high temperature-low pressure mineral associations are not discovered. So, it is considered that the glaucophane bearing rocks were resulted in regional dynamic metamorphism.