豫西双龙韧性剪切带的显微构造特征及变质变形环境分析  

Analysis on Microstructural Characteristics and Metamorphic Deformation Environment of Shuanglong Ductile Shear Zone in Western Henan Province

作　　者：靳立杰 王继林[3] 周汉文[4] 田明阳 李春稼 王子圣 韩姗 JIN Lijie;WANG Jilin;ZHOU Hanwen;TIAN Mingyang;LI Chunjia;WANG Zisheng;HAN Shan(No.1 Exploration Institute of Geology and Mineral Resource,Shandong Ji'nan 250014,China;Shandong Engineering Laboratory for Exploration of Rich Iron Deposit,Shandong Ji'nan 250014,China;Shandong Testing Center of China Metallurgical Geology Bureau,Shandong Ji'nan 250014,China;China University of Geosciences,Hubei Wuhan 430074,China)

机构地区：[1]山东省第一地质矿产勘查院,山东济南250100 [2]山东省富铁矿勘查技术开发工程实验室,山东济南250100 [3]中国冶金地质总局山东局测试中心,山东济南250100 [4]中国地质大学(武汉),湖北武汉430074

出　　处：《山东国土资源》2021年第8期15-20,共6页Shandong Land and Resources

基　　金：国家重点基础研究发展计划“973”(2007CB411307);国家自然科学基金重点项目(90081004)。

摘　　要：豫西双龙韧性剪切带是位于秦岭造山带核部的一条韧性剪切带,由两侧到中心依次发育了初糜棱岩、糜棱岩、超糜棱岩及假玄武玻璃一系列动力变质岩。该韧性剪切带是东秦岭造山带核部网结状走滑韧性剪切带中的一条,对其开展显微构造研究,对了解东秦岭造山带的变质变形环境及构造演化具有一定地质意义。本文在野外地质工作的基础上,通过对韧性剪切带进行岩石学和矿物显微构造特征分析,对韧性剪切带的性质及温度、古差应力、应变速率等变质变形环境进行了分析讨论。研究表明,双龙韧性剪切带运动学性质为左行剪切,变质变形温度约为400~500℃,古差应值约为51~61MPa。Shuanglong ductile shear zone in Henan province lies in the core of Qinling orogenic belt.From outside to inside,a series of dynamic metamorphic rocks developed,such as protomylonite,mylonite,ultramylonite and pseudotachylite developed in sequence.This ductile shear zone is one of the reticulate strike slip ductile shear zone in the core of eastern Qinling orogenic belt.Study on microstructures have been carried out.It has a certain geological significance for studying metamorphic deformation environment of eastern Qinling orogenic belt.On the basis of field geological work,through analysis on petrology and characteristics of microstructures of ductile shear zone,metamorphic deformation environment,such as properties,temperature,ancient stress and strain rate of ductile shear zone.have been analyzed and studied.It is showed that kinematic properties of Shuanglong ductile shear zone are sinistral shear,metamorphic deformation temperature is about 400℃~500℃,and the paleo stress value is about 51~61MPa.

关 键 词：韧性剪切带 显微构造特征 变质变形环境 豫西双龙 

分 类 号：P542.3[天文地球—构造地质学]