赣中变质岩带的组成及构造变质变形特征

胡恭任; 刘丛强; 章邦桐; 于瑞莲

赣中变质岩带的组成及构造变质变形特征

1. 中国科学院地球化学研究所贵州贵阳550002;
2. 华侨大学环境保护设计研究所,福建泉州362011;
3. 南京大学地球科学系江苏南京210093

基金项目:

国家杰出青年基金资助项目!( 496 2 5 30 4)

华桥大学科研起动资金

详细信息

中图分类号: P588.3
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出版历程
- 收稿日期: 1999-11-19
- 网络出版日期: 2023-08-16
- 发布日期: 2000-11-14

Composition and structural metamorphism-deformation features of the central Jiangxi metamorphic zone

1. Institute of Geomechanics, Chinese Academy of Sciences, Guiyang 550002,China;
2. Environmental Protection Design Institute, Overseas Chinese University, Quanzhou 362011, Fujian, China;
3. Department of Earth Sciences, Nanjing University, Nanjing 210093, China

摘要

摘要: 赣中变质岩带不是简单的一套震旦纪地层 ,而是由结晶基底中元古界中深变质岩系 (斜长角闪岩的Sm Nd全岩等时线年龄为 1113± 4 9Ma)和褶皱基底变质较浅的震旦系组成。两者之间以具热流体参与的混合岩化、韧性剪切带和递进变质三位一体组成的动热变质带接触。结晶基底经历了4期构造变质变形的叠加改造 ,每期构造变形都在变质岩石构造单元内留下各种变形形迹 ,变质作用表现为时间上的递进和空间上的叠加演化系列 ,是一套以众多的不平衡结构和多相共生混存的矿物组合 ,热变质带为一套动热变质塑性变形带 ,空间上依次形成绢云母—绿泥石带、黑云母带、石榴石带、十字石带以及夕线石带
- 结晶基底 /
- 褶皱基底 /
- 动热变质带 /
- 构造变质变形 /
- 赣中变质岩带
Abstract: The central Jiangxi metamorphic zone is not a simple suite of Sinian strata but composed of a Mesoproterozoic medium and high grade metamorphic series (the whole rock Sm Nd isochron age of amphibolite is 1 113±49 Ma) as the crystalline basement and the low grade metamorphic Sinian as the folded basement. Between them is a dynamo thermal contact metamorphic zone composed of migmatization, ductile shear zone and progressive metamorphism, which occurred in the presence of hydrothermal fluids. The crystalline basement underwent four phases of reworking by structural metamorphism deformation. The structural deformation of each phase left various deformation markings. The metamorphism is manifested by an evolutionary series which was progressive in time and overprinted in space and is marked by a mineral assemblage with many disequilibrium textures and many coexisting minerals. The thermal metamorphic zone is a zone of dynamo thermal metamorphism plastic deformation, and in space there appear successively the sericite chloride zone, biotite zone, garnet zone, staurolite zone and sillimanite zone.
- crystalline basement /
- folded basement /
- dynamo thermal metamorphic zone /
- structural metamorphism deformation /
- central Jiangxi metamorphic zone