| 华北北部麻粒岩相带构造区划及其早前寒武纪构造演化 |
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| 引用本文： | 李江海,翟明国.华北北部麻粒岩相带构造区划及其早前寒武纪构造演化[J].地质科学,1997,32(3):254-266. |
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| 作者姓名： | 李江海 翟明国 |
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| 作者单位： | 1. 北京大学地质学系, 北京100871;2. 中国科学院地质研究所, 北京100029 |
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| 摘 要： | 作者在编绘华北北部高级变质岩区的变质地质图(1:2000,000)的基础上,对麻粒岩相带构造区划提出了新方案,提出相带内部构造单元的边界与变质相界线并不协调崐的新认识。这一巨型麻粒岩相带可以划分为南北两个亚区,它们分别具有不同的岩石组合、崐变质特点及演化历史。北亚区为早元古代陆缘活动带的组成部分,由TTG质杂岩和少量表壳岩系组成,主要经历1期变质;南亚区为太古代克拉通的组成部分,与克拉通内主要构造单元具有密切联系,经历多期变质,由孔兹岩区、剪切构造带、TTG杂岩一表壳岩穹隆等单元组成。整个麻粒岩相带及其邻区记录了中太古代一早元古代初华北克拉通北部小陆块形成、稳定,直至拼合形成较大的克拉通陆块,再发生陆内裂谷及陆缘构造活动,最终发生克拉通化的构造地质演化过程。
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| 关 键 词： | 麻粒岩相带 亚区划分 构造单元 边界性质 克拉通化 早期演化 |
| 收稿时间： | 1997-02-12 |
| 修稿时间： | 1997-02-12; |
THE TECTONIC DIVISION OF NORTH CHINA GRANULITE FACIES BELT AND ITS EARLY PRECAMBRIAN TECTONIC EVOLUTION |
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| Li Jianghai,Qian Xianglin,Zhai Mingguo.THE TECTONIC DIVISION OF NORTH CHINA GRANULITE FACIES BELT AND ITS EARLY PRECAMBRIAN TECTONIC EVOLUTION[J].Chinese Journal of Geology,1997,32(3):254-266. |
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| Authors: | Li Jianghai Qian Xianglin Zhai Mingguo |
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| Institution: | 1. Department of Geology, Peking University, Beijing 100871;2. Institue of Geology, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | The regional metamorphic-geological map of North China granulite facies belt(NCGFB) and adjacent terrains, is compiled by the authors, based upon the accumulated data in the recent years, and the belt is divided on the tectonics, which indicates that its structural patterns is inharmonious to the isogrades of the metamorphic belt. It is composed by two subbelt, i. e., northern subbelt(NSB) and southern subbelt(SSB). The NSB is a part of the northern margin active belt along the North China Craton (NCC), mainly composed of TTG complex and minor supracrustal sequences; whereas the SSB is the major early components of NCC, closely associated with the evolution of the craton, may be subdivided into khondalites terrain, sheared tectonic belt, TTG complex-supracrustal sequences domes etc.. The Mid-Arehean to early crustal evolutionary history was revealed by the NCGFB, related with the accretion and collage of small blocks, crationazation and rifting of larger block, and finally stablization of the continental plate. |
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| Keywords: | Cranulite facies belt Tectonic division Cratonization Rock assemblages Early Precambrian tectonic evolution |
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