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科学通报  2014 

阿尔泰造山带超高温变泥质麻粒岩的确定及其地质意义

DOI: 10.1360/csb2014-59-20-1984, PP. 1984-1991

Keywords: 超高温变质作用,变泥质麻粒岩,阿尔泰造山带,P-T轨迹

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Abstract:

通过岩相学和矿物成分特征及P-T计算结果,最近在阿勒泰以东喀拉苏附近发现了超高温变泥质麻粒岩,其矿物组合为石榴石+斜方辉石+矽线石+堇青石+尖晶石+黑云母+斜长石+石英等.斜方辉石具有高铝特点,其Al2O3含量高达8.7wt%,指示了超高温变质的条件,其峰期变质条件为P=~0.80GPa,T=~960℃.变质结构关系和P-T估算结果表明了一个峰期后近等压冷却的逆时针P-T轨迹.锆石U-Pb年龄结果(271±5Ma)支持了该超高温变质事件发生于二叠纪.喀拉苏附近超高温变泥质麻粒岩的发现确认了阿尔泰造山带二叠纪超高温变质作用的存在,表明在二叠纪阿尔泰造山带南缘高热流伸展背景可能与二叠纪(270~280Ma)塔里木地幔柱活动有密切成因关系.

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