崇安-石城构造带中段韧性变形特征  

DUCTILE DEFORMATION IN THE MIDDLE CHONGAN—SHICHENG STRUCTURAL ZONE

作　　者：陈柏林[1] 蔡本俊[1] 林仟同[2] 陈建国[2] 

机构地区：[1]中国地质科学院地质力学研究所 [2]闽北地质大队

出　　处：《地质力学学报》1996年第1期49-54,共6页Journal of Geomechanics

摘　　要：崇安-石城构造带中段除了大规模脆性破碎和低温石英脉外,还表现为明显的早期韧性变形特征,油岭—盐隘韧性断裂是其表现之一。该断裂具有典型糜棱岩组合、S—C组构、a 线理及石英光轴 S+Z 型组构,运动指向上层由 NW 向 SE,应变测量表明最大剪应变为1.16—3.46,剪切总位移可达1.9km,变形差应力为60—90MPa。油岭—盐隘韧性断裂是一条成生于中温(400—500℃),较高应变速率条件下的变形带。The middle part of the Chongan—Shicheng tectonic zone is characterized by duc- tile deformation in the early stage and brittle fracturing accompanied by low—temperature quartz veins in the late stage.The early ductile deformation is well represented by the be- haviours of the Youling—Yanai shear zone about 2—5 Km wide as indicated by typical my- lonite associations,lineation,S—C fabrics and S+Z type fabrics of quartz optical axis.Fi- nite strain measurements show a maximum shear strain of about 1.16—3.46.The total dis- placement is 1.9 Kin.The differential stess is about 60—90MPa.It was formed at medium temperature of 400—500℃ and a higher strain rate.

关 键 词：崇安-石城 构造带 韧性变形 糜棱岩 

分 类 号：P551[天文地球—构造地质学]