苏鲁造山带南缘虎山多期次韧性剪切变形特征研究  

Multiple Superposition Ductile Shear Zone in Hushan Region, Southern Edge of Su-lu Orogenic Belt

作　　者：潘明宝[1] 陈火根[2] 解国爱[1] 张庆龙[1] 卢华复[1] 陈守矩[2] 

机构地区：[1]南京大学地球科学系,南京210093 [2]江苏省地质调查研究院,南京210018

出　　处：《高校地质学报》2004年第1期62-69,共8页Geological Journal of China Universities

摘　　要：从变形机制、力学性质和变质变形矿物世代研究入手 ,对江苏东北部苏鲁造山带南缘东海虎山多期叠加剪切带进行的研究表明 ,该区存在三期韧性剪切变形 ,第一期为滑脱拆离变形 ,长英质糜棱岩中形成长石拉伸线理 ,榴辉岩中形成绿辉石、石榴石分异成分层 ;第二期变形为韧性逆冲 ,形成蓝晶石、多硅白云母、黝帘石拉伸线理 ,在榴辉岩中形成石榴石眼球体 ;第三期变形为韧脆性逆冲构造 ,形成长英质S -C糜棱岩 ,具S -C面理和丝带状石英条带 ,该结论为建立区域构造变形序列提供了依据。Multiple superposition ductile shear zone, where multiple ductile movements activated entirely or nearly in same shear zone, is a common feature in gneiss complex of the Precambrian orogenic belts. Based on the studies of deformation mechanisms, dynamic properties and deformed metamorphic mineral generations, and to analyse the regional structural sequence and build a regional scheme of events correctly, we investigated the multiple superposition ductile shear zone in Hushan area, Donghai county, Jiangsu Province.The results suggest that there are three generations of ductile shear activities. The first is detachment movement with feldspar stretching lineationes in felsic mylonites and omphacite-garnet differentiation layers in deformed eclogites. The second is ductile thrust movement with kyanite and muscovite (partly 3-T phengite) and zoisite stretching lineations and garnet ougens in eclogite mylonites. The third is semibrittle thrust movement with s-c foliations and quartz ribbons in felsic s-c mylonites.

关 键 词：多期叠加剪切带 糜棱岩 变形矿物世代 苏鲁造山带 

分 类 号：P542[天文地球—构造地质学]