鲁西地区丰阳—梁邱韧性剪切带构造变形特征及演化  

Ductile shear zone deformation characteristics and evolution of the Fengyang-Liangqiu area in western Shandong

作　　者：刘书锋 Liu Shufeng(No.1 Geological Team of Shandong Provincial Bureau of Geology and Mineral Resources,Jinan 250014,Shandong,China)

机构地区：[1]山东省第一地质矿产勘查院,山东济南250014

出　　处：《地质学刊》2024年第4期350-358,共9页Journal of Geology

基　　金：中国地质调查局国土资源大调查项目“华北地区基础地质调查及数据更新”(1212010510509)子项目“1∶25万济宁市、临沂市幅区域地质调查(修测)项目”(基〔2005〕005-09号文)。

摘　　要：鲁西地区变形岩石为TTG(奥长花岗岩、英云闪长岩、花岗闪长岩)质花岗岩,普遍发育片麻状、条带状构造,塑性变形极为发育、递进变形普遍、条带形态异常复杂,丰阳—梁邱韧性剪切带为其中一条规模巨大、韧性变形强烈的构造带。通过研究石英组构、剪切温度、强度、位移量、应变参数估算,结果表明:可将该剪切带分为高温低剪切片麻岩变形期、中温低剪切右行平移期,主应变期为吕梁运动时期;泗水—梁邱断裂带格局构造可分为4段,右行压扭断裂为韧-脆性变形(断裂)演化所致,是丰阳—梁邱韧性剪切带的延续;韧-脆性变形转换域兼具两端元变形域的特征性微观变形构造:同一矿物相、不同矿物相或不同尺度内韧脆性变形共存。The deformed rocks in the western Shandong region are TTG(trondhjemite,tonalite,granodiorite)granites,widely exhibiting schistose and banded structures,with highly developed plastic deformation,progressive deformation,and complex band morphologies.The Fengyang-Liangqiu ductile shear zone is one of the massive structures characterized by intense ductile deformation within this region.Studies of quartz fabric,shear temperature,intensity,displacement,and strain parameter estimations have led to the differentiation of the shear zone into a high-temperature,low-shear schistose deformation phase and a medium-temperature,low-shear right transcurrent phase,with the principal strain phase corresponding to the Lüliang Movement.The Sishui-Liangqiu fault zone structure can be divided into four segments,exhibiting a right-lateral compression-torsion fault,resulting from ductile-brittle deformation(fracturing)evolution and constituting the continuation of the Fengyang-Liangqiu ductile shear zone.The ductile-britile deformation transition zone displays characteristic microstructural deformations of both end-member deformation domains:coexisting ductile and brittle deformations within the same mineral phase,different mineral phases,or across different scales.

关 键 词：韧性剪切带 韧-脆性变形转换 丰阳—梁邱韧性剪切带 鲁西地区 

分 类 号：P548[天文地球—构造地质学]