湘东北连云山杂岩流变学特征研究

现代地质 ›› 2005, Vol. 19 ›› Issue (2): 211-216.

湘东北连云山杂岩流变学特征研究

李金冬^1,2，彭和求^3,4，贾宝华^1,2，陈俊⁴，郭乐群⁴，何江南⁴，唐晓珊⁴

1中国地质大学地球科学与资源学院，北京100083；2湖南省地质矿产勘查开发局，湖南长沙410011；
3中国地质大学地球科学学院，湖北武汉430074；4湖南地质调查研究院，湖南湘潭411100

收稿日期:2004-10-11 修回日期:2005-02-20 出版日期:2005-02-20 发布日期:2005-02-20
作者简介:李金冬，男，教授级高级工程师，博士研究生，1963年出生，矿物学、岩石学、矿床学专业，主要从事区域地质调查和矿产资源勘查的管理工作。
基金资助:
中国地质调查局地质大调查项目（20001300002071，20011300000）

Study on Rheology Characteristics of the Lianyunshan Complex in Northeastern Hunan Province

LI Jin-dong^1,2, PENG He-qiu^3,4, JIA Bao-hua^1,2, CHEN Jun⁴, GUO Le-qun⁴, HE Jiang-nan⁴, TANG Xiao-shan⁴

1School of Earth Sciences and Resources ,China University of Geosciences,Beijing100083 ,China;
2Hunan Bureau of Geology and Mineral Exploration and Devolopment, Changsha, Hunan410011,China;
3Faculty of Earth Sciences, China University of Geosciences, Wuhan, Hubei430074， China;
4Hunan Institute of Geological Survey Research, Xiangtan, Hunan411000， China

Received:2004-10-11 Revised:2005-02-20 Online:2005-02-20 Published:2005-02-20

摘要/Abstract

摘要：

出露于湘东北九岭—幕阜山岭之中的连云山杂岩属于古元古代结晶基底岩系。利用野外构造解析、岩组、石英分形理论等手段,对湘东北连云山杂岩的变形表象和变形机制进行了详细的观察和研究。结果表明: 连云山杂岩至少遭受了早期韧性剪切和晚期韧性再造两个阶段，石英塑性流变以菱面滑移系的作用为主；从早期构造片（麻）岩到晚期韧性再造形成条纹条带状混合岩，其应变速率从早期的中应变速率（10^-8.8s^-1）到晚期的低应变速率（10^-12s^-1）是逐渐降低的；岩石的塑性流动变形机制不仅反映了角闪岩相的中、上地壳形成环境，而且表明“雪峰古陆”基底中更深层次的物质尚未抬升出来。

关键词: 流变学, 应变速率, 连云山杂岩, 湘东北

Abstract:

The Lianyunshan complex, cropping in the JiulingMufushan range in the northeastern Hunan Province, belongs to the paleo-Proterozoic crystalline basement rocks. By means of field structure analysis, petrofabrics and fractal dimension analysis of quartz, the authors have carefully studied the deformation feature and mechanism of the Lianyunshan complex in the northeastern Hunan Province. The results are : （1）the Lianyunshan complex has undergone two stages of the earlier ductile shear and the later ductile reconstruction. Plastic flow deformations of quartz grains are mainly rhombohedral slip; （2）strain rate gradually reduces from the earlier structural schist (gneiss) of middle strain rate（10^-8.8s^-1）to the later ductile reconstruction striped migmatite of low strain rate（10^-12s^-1）;（3）plastic flow deformation mechanism of the rocks not only reflects amphibolite facies formed in the midupper crust environment, but also suggests that the deeper crustal material in the Xuefeng land have not yet been uplifted.

Key words: rheology, strain rate, Lianyunshan complex, northeastern Hunan Province

中图分类号:

李金冬，彭和求，贾宝华，陈俊，郭乐群，何江南，唐晓珊　. 湘东北连云山杂岩流变学特征研究[J]. 现代地质, 2005, 19(2): 211-216.

LI Jin-dong,PENG He-qiu,JIA Bao-hua,CHEN Jun,GUO Le-qun,HE Jiang-nan,TANG Xiao-s. Study on Rheology Characteristics of the Lianyunshan Complex in Northeastern Hunan Province[J]. Geoscience, 2005, 19(2): 211-216.

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