大别—苏鲁区残余超高压构造及其动力学意义

索书田; 钟增球; 游振东; 周汉文

大别—苏鲁区残余超高压构造及其动力学意义

1.
中国地质大学地球科学与资源学院, 北京 100083
2.
中国地质大学地球科学学院, 武汉 430074

基金项目:

国家重大基础发展项目 G1999075506

国家自然科学基金资助项目 49972067

国家自然科学基金资助项目 49794041

国家自然科学基金资助项目 49772146

详细信息

作者简介:
索书田, 男, 教授, 1936年生, 长期从事构造地质学、岩石圈流变学和显微构造学的教学和研究工作, 近年来主要进行超高压-高压变质岩构造学研究

中图分类号: P541
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出版历程
- 收稿日期: 2000-06-29
- 刊出日期: 2000-11-25

RELIC UHP STRUCTURES IN DABIE-SULU REGION, CHINA: STRUCTURAL EXPRESSION AND GEODYNAMIC SIGNIFICANCE

1.
Faculty of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 根据构造学及岩石学研究并结合已有同位素年代学资料地质意义分析证明, 现在观察到的大别-苏鲁超高压变质带的区域构造框架, 主要是在三叠纪中朝与扬子克拉通碰撞期后(200~170 Ma) 伸展体制和角闪岩相条件下形成的. 残余的同碰撞及超高压构造只保留在较大的榴辉岩及其他超高压变质岩体内部. 以湖北省麻城县乘马岗和何家湾、安徽省岳西县碧溪岭及江苏省东海等地区的榴辉岩为例, 分析描述了具弱面理的块状榴辉岩、超高压剪切带和A型褶皱等残余超高压构造. 强调指出, 只是这些早期的构造记录才反映大陆碰撞阶段的构造环境及相对运动学特征. 据此提出一个运动学模型, 表示三叠纪(240~210 Ma) 扬子克拉通向北俯冲于中朝克拉通之下并与其发生斜向碰撞的动力学格局.
- 残余UHP构造 /
- 伸展过程 /
- 挤压体制 /
- 拉伸线理 /
- 大别-苏鲁区
Abstract: Structural and petrological research combined with the geological analysis of the isotopic dating references available now is used in this paper to demonstrate that the present day observed tectonic framework of the ultrahigh pressure (UHP) metamorphic belt in the Dabie Sulu region was formed dominantly in an extensional process at 200-170 Ma, on amphibolite facies conditions, following the Triassic collision between the Sino Korean and Yangtze cratons. The relic syn collision and UHP structures are preserved in the relatively large eclogite and other UHP metamorphic rock masses. Examples of the eclogite drawn from the Chengmagang and Hejiawan in Hubei Province, the Bixiling in Anhui Province, and Donghai in Jiangsu Province, are used to analyze and describe such relic UHP structures as the massive eclogite with weak foliations, the UHP shear zones and A type folds. It is stressed in the paper that only early UHP relic structural records may reflect the tectonic environment in the continental collision stage, and the corresponding relative dynamic features. On this basis, a kinematic model is proposed to represent the dynamic framework of the northward subduction of the Triassic (240-210 Ma) Yangtze craton under the Sino Korean craton and of their corresponding oblique collision.
- relic UHP structure /
- extensional process /
- compressive regime /
- stretching lineation /
- Dabie Sulu region

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图 1 大别-苏鲁三叠纪碰撞期后伸展构造略图

QHF.确山-合肥断裂带; XFF.信阳-肥西断裂带; GMF.龟山-梅山断裂带; JMF.军马河-马蹄湾断裂带; BMXF.八里畈-磨子潭-晓天断裂带; XGF.襄樊-广济断裂带; TLF.郯城-庐江断裂带; WYF.五莲-烟台断裂带; CC.核部杂岩; UHP.超高压单位; HP.高压单位; EB. 绿帘石-蓝片岩单位; SC.沉积盖积

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图 2 湖北省麻城县乘马岗UHP变质带横剖面

1.榴辉岩; 2.片麻岩; 3.岩墙

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图 3 湖北省麻城县何家湾地区构造略图及剖面

1.晚中生代岩墙; 2.面理化含榴花岗岩; 3.绿帘二云母片麻岩; 4.小型榴辉岩透镜体; 5.具挤压组构的榴辉岩透镜体; 6.伸展面理及拉伸线理; 7.断层

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图 4 江苏东海UHP榴辉岩带构造略图

等面积赤平投影图内, 黑三角示UHP面理极点(计20个), 伸展面理(计42个) 等值线为百分之一面积内2.4%, 7.1%, 11.9%, 16.7%.1.榴辉岩; 2.橄榄岩; 3.同碰撞面理; 4.伸展面理; 5.片麻岩; 6.拉伸线理方向

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图 5 三叠纪中朝与扬子克拉通间碰撞运动学模式

YC.扬子克拉通; SKC.中朝克拉通; BMXF.八里畈-磨子潭-晓天断层; GMF.龟山-梅山断层; Ec.榴辉岩

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