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柴北缘西段超高压地体折返过程中的部分熔融:榴辉岩及其退变产物中的浅色脉体研究 被引量:8

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摘要 岩石学、地球化学和同位素年代学研究表明,柴北缘西段锡铁山和胜利口地区的榴辉岩/退变榴辉岩中的浅色脉体是超高压地体折返过程中榴辉岩发生部分熔融的结果.浅色脉体主要由粗晶斜长石组成,包绕或切穿榴辉岩/退变榴辉岩体.脉体中的锆石呈自形柱状形态,具有明显岩浆成因震荡环带结构和包体矿物组合,定年结果得到脉体的形成时代分别晚于寄主榴辉岩/退变榴辉岩的峰期变质时代约20-30 Ma,与寄主岩石麻粒岩相退变质时代一致,指示熔融作用发生在折返过程的麻粒岩相退变质阶段.浅色脉体具有高Si,Al,Ca,Na,Sr,Pb和LREE而低Mg,Fe,K,Y,Yb和HREE的英云闪长岩的地球化学特征,黝帘石和绿辉石的脱水分解是触发超高压榴辉岩发生部分熔融形成这些浅色脉体的主要机制.
出处 《科学通报》 EI CAS CSCD 北大核心 2013年第22期2209-2214,共6页 Chinese Science Bulletin
基金 国家重点基础研究发展计划(2009CB825003) 国家自然科学基金(41072051)资助
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