大别造山带东部假玄武玻璃的成因  

ORIGIN OF PSEUDOTACHYLITES FROM THE EASTERN DABIESHAN OROGENIC BELT

作　　者：刘建民[1] 董树文[1] 张家声[2] 刘晓春[1] 陈柏林[1] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]中国地震局地质研究所,北京100029

出　　处：《地质力学学报》2003年第2期97-105,共9页Journal of Geomechanics

基　　金：国家自然科学基金项目(编号:40172077)的阶段性研究成果。

摘　　要：最近,在大别造山带东部广泛发现了假玄武玻璃出露点,这些假玄武玻璃主要沿NE-SW向断裂带或剪切带发育。某些假玄武玻璃内发育糜棱质条带。本文主要讨论了大别造山带东部假玄武玻璃的显微构造、岩石化学及稀土元素地球化学等特征,在此基础上阐述了发育在该地区的假玄武玻璃的成因。Recent field survey in the eastern Dabieshan has revealed extensive occurrences of pseudotachylite. The pseudotachylite tends to occur in the NE-SW trending fracture zones or shear zones which parallel the Tan-Lu fault zone and cut all the pre-Cretaceous geological bodies. Mylonitic bands are developed in some pseudotachylites. This paper mainly discusses the origin of the pseudotachylites according to the geochemistry between the pseudotachylites and their host rocks, as well as the characteristics of the microstructures gained by optical microscope and SEM imaging.

关 键 词：成因 显微构造 地球化学 假玄武玻璃 大别造山带 岩石 

分 类 号：P581[天文地球—岩石学]