韧性剪切变形条件下花岗岩中稀土元素变化特征研究  

Study of REE Variations of Granite and Its Deformed Tectonic Rocks under Ductile Shearing

作　　者：杨晓勇[1] 刘德良[1] 戴晓平 杨学明[1] 

机构地区：[1]中国科学技术大学地球和空间科学系

出　　处：《稀土》1999年第1期6-10,共5页Chinese Rare Earths

基　　金：国家九五重点科技攻关项目

摘　　要：本文对郯庐断裂带南段安徽境内管店花岗岩及其韧性剪切带中的糜棱化岩石进行了主要元素和稀土元素的研究。在详细的野外工作基础上，由岩体向韧性剪切带中心系统测量地质剖面并采集有代表性的岩石样品进行室内分析研究。分析结果显示，随着岩石受剪切变形作用的加强，稀土元素呈富集的趋势。各岩石球粒陨石标准化图解表现为右倾型，即轻稀土富集型。轻稀土也是随着岩石变形作用的加强而较重稀土元素富集。全文详细探讨了韧性剪切变形作用条件下岩石中稀土元素的活化转移的原因，我们认为变质－变形－流体渗滤的联合作用是导致岩石中稀土元素活化转移的主要因素。On the basis of study of field geological survey and systematic sampling in Guandian granite and its tectonic rocks in the ductile shear zone from the south of Tancheng-Lujiang fault belt,the paper presents the characteristics of major and rare earth elements in the rocks.The results show that total REEs in the tectonic rocks are enriched with the intensity of the ductile shearing,and the same with the light REEs compared to the heavy REEs.The diagram of the REE distribution shows the light REE enrichment.The paper presents that the joint function of metamorphism-deformation and fliud/rock interaction is the predominant reason for the enrichment in the granite and its tectonic rocks.

关 键 词：花岗岩 韧性剪切带 稀土元素 活化转移 稀土矿床 

分 类 号：P618.7[天文地球—矿床学]