胶南隆起北缘石门-薛家庄韧性剪切带

SHIMEN-XUEJIAZHUANG DUCTILE SHEAR BELT IN THE NORTH MARGIN OF JIAONAN UPLIFT

摘要:

石门－薛家庄韧性剪切带曾经历过正－左行平移、正－右行平移及左行正滑三期剪切运动。其东段以正－右行平移运动为主，中段具左行正滑性质，而其西段（小卜落崮韧性剪切带）则主要为左行平移。该剪切带同时又是一条经受了低绿片岩相－角闪岩相变形的多相剪切变形带。在剪切带的横剖面上，石英与斜长石的粒度在弱变形带中具双峰式分布的特征，在强变形带中则细而均匀；钾长石的粒度在弱变形带中粗而均匀，在强变形带中则呈现双峰式分布。钾长石和斜长石在韧性变形过程中均可向钠长石转化，应力越大转化越彻底。剪切带的变形机制为简单剪切机制，石英滑移系既有底面滑移又有柱面、菱面滑移。

Abstract:

Shimen-Xuejiazhuang ductile shear zone spreads in the south of the Shanxiangjia Haoguanzhuang fault and has a strike of 60° in NE. It is about 60km long and 0. 5～3. 5km wide, and comparable with the Xiaopuluogu ductile shear zone. According to the macroscopic and microcosmic shear symbols,the shear zone has experienced threee shear movements: normal right-handed strike-slip (the direction of plunge of extention lineation is 284°),normal right-handed strike-slip (the strike extention lination is 50°)and left...