庐山星子群变质岩的变质作用P-T条件研究  

THE STUDY ON THE METAMORPHISM AND METAMORPHIC AGE FROM XINGZI GROUP, LUSHAN

作　　者：张海祥[1] 张伯友[1] 孙大中[1] 朱炳泉[1] 

机构地区：[1]中国科学院广州地球化学研究所

出　　处：《矿物岩石》2003年第2期32-36,共5页Mineralogy and Petrology

基　　金：中科院知识创新工程项目资助 (编号 KZCX2 -10 2 )

摘　　要：对分布于扬子块体南缘古元古代星子群变质岩的变质作用研究表明 ,它们普遍经历了角闪岩相的变质 ,其变质温度为 4 80℃～ 5 80℃ ,压力在 30 0 MPa～ 5 0 0 MPa之间。这与扬子块体南缘其他元古代地层仅经历了轻微变质的事实截然不同 ,表明星子群变质岩具有独特的构造演化历史。越来越多的研究发现 ,星子群变质岩是由地壳伸展作用引发的、来源于下地壳的前寒武纪变质基底 ,它并不是来源于华夏块体的“飞来峰”。The study on metamorphism of metamorphic rocks from Xingzi Group shows that they have undergone a hornblende facies metamorphism. The metamorphic temperature is about 480℃～580℃,and pressure is between 300 MPa～500 MPa. It is very different from other Proterozoic rocks distributed along the southern margin of Yangtz Block and has a very special tectonic evolution history. Although the metamorphic features of Xingzi metamorphic rocks are similar to those of Mayuan Group and Badu Group which have the same age with Xingzi Group in Huaxia Block,they have very different geochemical features and tectonic environments. More and more research data indicate that Xingzi Group is the 'nappe outlier' from Huaxia Block, but the Precambrian metamorphic basement caused by crustal extension.

关 键 词：星子群 变质作用 庐山 变质岩 地壳伸展作用 元古代 变质温压条件 

分 类 号：P588.3[天文地球—岩石学]