辽西医巫闾山变质核杂岩中间流变层变形特征  

Deformation Characteristics of Middle Ductile Rheological Bed of the Yiwulüshan Metamorphic Core Complex in Western Liaoning Province

作　　者：梁雨华[1] 王献忠[2] 于文祥[3] 王荣茹 

机构地区：[1]吉林师范大学旅游与地理科学学院,吉林四平136000 [2]中国人民武装警察部队黄金三支队,哈尔滨150069 [3]长春市国土资源登记中心,长春130021 [4]辽宁地质海上工程勘察院岩土实验室,辽宁大连116200

出　　处：《吉林大学学报（地球科学版）》2009年第4期711-716,共6页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(40572117);国家自然科学基金重大研究计划项目(90814006)

摘　　要：医巫闾山变质核杂岩具有典型的三层结构：变质核、中间韧性流变层和上盘脆性变形的盖层。由中新元古界沉积岩系组成的韧性流变层是医巫闾山变质核杂岩的重要组成部分，它们主要分布在变质核杂岩东部、北部和南部一带，遭受了低绿片岩相的变形变质作用改造，其内发育了各种顺层流变组构。中间韧性流变层同构造石英脉的流体包裹体分析结果表明：均一温度为150-170℃，密度为0．96-0．98g／cm^3，压力为40-50MPa，形成深度为5-6km.依据流体包裹体分析数据，结合显微构造特征分析，韧性流变层变形作用发生在地壳浅部层次低温低压环境中，以韧脆性变形机制为主。The Yiwultishan metamorphic core complex（YMCC） has typical three-layered structures.a metamorphic core, a middle ductile rheological bed and a cover bed of brittle deformation in the hanging wall. The middle ductile theological bed is composed of the Mesoproterozoic and Neoproterozoic sedimentary rocks and is important part of the YMCC, distributing in the Eastern, Northern and Southern parts of YMCC. Middle ductile theological bed was deformed by metamorphosed in lower greenschist facies, forming variedbedding rheological fabrics. The data of fluid inclusion analysis of the syntectonic quartz veins in the middle ductile rheological bed suggest a homogenization temperature of 150 - 170 ℃, density of 0.96-0.98 g/cm^3, pressure of 40-50 MPa, andadepthof5-6 km. According to these new data presented, the deformation of the middle ductile rheological bed must have occurred under a lower temperature environment in the upper crust level, mainly representing brittle-ductile deformation.

关 键 词：医巫闾山 变质核杂岩 中间流变层 流体包裹体 显微构造 

分 类 号：P588.3[天文地球—岩石学]