摘要
大和坑-丰稔韧性剪切带，为目前发现的闽酉南地区最古老的构造带，韧性剪切带断续展布长约52km，宽15.5km，呈NNE向“S”形。从剪切带边缘到中心依次发育糜棱岩化带、初糜棱岩带、糜棱岩带，超糜棱岩带；形变岩石以发育强化面理、拉伸线理Sa-Se组构、剪切褶皱、不对称残斑构造、不对称压力影构造、构造重结晶及粒内应变效应为主要特征；变形岩石的造岩矿物塑性变形具明显的递进变形特征，剪切带形成于晋宁运动时期的造山带构造环境，形成深度16．6-19.0km，古差应力4．5×10^8Pa，为简单剪切和压扁双重力学机制作用的右行平移韧性剪切带，剪切总位移大于20．7km。
The Dahekeng—Fengniang ductile shear belt,which extends 52 km long and 15.5 km wide andtakes the shape of“S”with the trending of NNE,is the oldest tectonic belt found in Southwestern Fu-jian.From its margin to centre there are in turn mylonitization zone,protomylonite zone,mylonite zoneand ultramylonite zone.The deformed rocks in the belt are characterized by the development ofstrengthened foliation,stretching lineation,S_s-S_c fabric,shear-fold,asymmetrical porphyroid struc-ture,asymmetrical pressure-shadow structure,tectogenetic recrystallization and intragranular strain ef-fect.The plastic deformation of rock-forming minerals in the deformed rocks has the character of appar-ent increment.The ductile shear belt was formed in the tectonic environment of the orogenic zone duringJinning Movement.The deepth of forming the shear belt is 16.6—19.0 km and the palaeostress differ-ence 4.5×10~8 Pa.It belongs to a right-lateral transcurrent ductile shear belt formed by both simpleshearing and flattering.The total shear displacement is more than 20.7 km.
出处
《福建地质》
1991年第4期270-280,共11页
Geology of Fujian
