大别山碰撞后花岗岩锆石包裹物研究——对埃达克质岩源区及熔融深度的制约  

Study of Zircon Inclusions of Dabie Post-collisional Granitoids-contraints on Source and Melting-depth of Adakitic Rocks

作　　者：常铭[1] 吴洪杰[1] 李淼[1] 冯嘉[1] 何永胜[1] 

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《矿物岩石地球化学通报》2014年第4期477-483,共7页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：中央高校基本科研业务费专项资金资助项目(2-9-2012-129)

摘　　要：大陆型埃达克岩的成因及其地质意义是一个很有争议的科学问题。大别地区发育有典型的加厚下地壳底部部分熔融产生的埃达克质岩。元素地球化学以及实验岩石学研究均表明,若这些埃达克质岩确来自加厚下地壳底部部分熔融,其残留相矿物应为石榴子石、绿辉石、金红石等高压矿物。本文对大别山埃达克质岩石和普通花岗岩中的锆石包裹物进行了激光拉曼光谱鉴定,证实了埃达克质岩中锆石存在石榴子石、绿辉石、金红石、白云母等矿物包裹物。如果这些矿物是与锆石在岩浆中共结晶形成的,这或可为大别山埃达克质岩的源区特征提供直接证据。The petrogenesis and geological implications of continental adakite rocks are still controversial. Some Dabie granitoids have been demonstrated as representative cases of adakitic rocks produced by partial melting of thick- ened lower continental crust. Earlier element geochemistry research and experiment study indicated that, if these rocks were produced by partial melting of eclogitic lower crust, garnet and clinopyroxene would be considered as the major residual minerals and plagioclase would be absent from the residue. This study analyzed zircon inclusions from Dabie adakitic rocks and normal granites with the laser Raman spectroscopy and confirmed that zircons from adakitic rocks contain mineral inclusions of garnet, omphacite, rutile and muscovite. If these minerals were co-crystallized with zircons in the early melting, it should be the direct evidence for the Source feature of Dabie adakitic rocks.

关 键 词：大别碰撞后花岗岩 锆石包裹物 埃达克质岩源区 

分 类 号：P588.121[天文地球—岩石学]