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地质通报  2008 

青藏高原羌塘高压变质带的特征及其构造意义

, PP. 27-35

Keywords: 青藏高原,羌塘,高压变质带,龙木错-双湖缝合带,构造意义

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Abstract:

羌塘高压变质带分布于龙木错-双湖板块缝合带的南侧,西起红脊山,经片石山、蓝岭、角木查尕日、纳若,到双湖以东的才多茶卡,长约500km。向东已经延伸到巴青以北和昌都的吉塘地区,再向南进入滇西与澜沧江蓝片岩带共同构成一条断续延伸近2000km的高压变质带。羌塘高压变质带主要由蓝片岩和榴辉岩构成,蓝闪石片岩中蓝闪石和多硅白云母同位素定年结果为223~215Ma,榴辉岩的变质年龄为243~217Ma。估算蓝片岩的变质温度为410~460℃,变质压力为0.67~0.75GPa;榴辉岩相的变质作用温度不超过500℃,压力为1.56~2.35GPa。羌塘高压变质岩定年研究结果确定龙木错-双湖板块缝合带最终碰撞闭合发生在晚三叠世早期。羌塘高压变质带是冈瓦纳与欧亚大陆汇聚事件的重要记录。

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