吉林大学学报(地球科学版) ›› 2018, Vol. 48 ›› Issue (2): 534-544.doi: 10.13278/j.cnki.jjuese.20170272
赵立敏1, 刘永江1, 滕加雨2, 李伟民1
Zhao Limin1, Liu Yongjiang1, Teng Jiayu2, Li Weimin1
摘要: 内蒙古头道桥地区出露了一套经高压变质形成的岩石组合。本次研究通过岩相学和矿物化学分析,根据矿物组合的不同,识别出蓝片岩、绿片岩两种不同类型的岩石类型。其中,蓝片岩的矿物组合为角闪石(蓝闪石、蓝透闪石)+绿帘石+钠长石+绿泥石+石英+赤铁矿±多硅白云母±方解石±榍石;绿片岩的矿物组合为绿泥石+钠长石+石英±绿帘石±角闪石(阳起石、镁角闪石、蓝透闪石、冻蓝闪石等)±多硅白云母±赤铁矿。确定了蓝片岩的峰期变质级别为绿帘-蓝闪片岩相,峰期变质温度为400~600℃,压力为1.2~1.4 GPa。绿片岩的峰期变质级别为绿帘-角闪岩相。结合前人研究成果,认为蓝片岩和绿片岩的形成与额尔古纳地块和兴安地块的碰撞拼合有关。
中图分类号:
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