| “吕梁运动”新认识 |
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| 引用本文： | 李江海,钱祥麟.“吕梁运动”新认识[J].地球科学,2000,25(1):15-20. |
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| 作者姓名： | 李江海 钱祥麟 |
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| 作者单位： | 北京大学地质学系,北京 100871 |
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| 基金项目： | 国家自然科学基金,49832030;49772143;49572140, |
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| 摘 要： | 吕梁运动(1.90~1.70 Ga)长久以来被认为是华北克拉通最终稳定固结的造山运动.事实上, 在古元古代末期华北克拉通以伸展-裂解构造为主, 表现为拗拉谷系发育、非造山岩浆活动(环斑花岗岩、斜长岩、辉长岩、花岗岩类及伟晶岩脉等)、大规模基性岩墙群侵位以及早期变质基底隆升或退变质构造热事件等.对已有的大量同位素年代学资料分析后证明, 这一时期的岩浆侵位与基底构造-热事件在时间上的分布具有多峰式特点, 克拉通基底隆升退变质事件滞后于岩浆侵位, 明显区别于造山带普遍记录的构造变形-变质-岩浆侵位的事件序列.古元古代末期构造格局的重新认识, 为我国克拉通在元古代超大陆中的再造模式提供了最基本的制约条件.
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| 关 键 词： | 拗拉谷 基性岩墙群 构造-热事件 伸展构造 超大陆 吕梁运动 华北克拉通 |
| 文章编号： | 1000-2383(2000)01-0015-06 |
| 收稿时间： | 1999-08-25 |
LATE PALAEOPROTEROZOIC TO EARLY MESOPROTEROZOIC TECTONIC FRAMEWORK AND MAJOR TECTONO-THERMAL EPISODES OF NORTH CHINA: NEW INTERPRETATION OF "LLIANG OROGENY" |
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| Li Jianghai,Qian Xianglin,Hou Guiting,Liu Shuwen,Chen Jing.LATE PALAEOPROTEROZOIC TO EARLY MESOPROTEROZOIC TECTONIC FRAMEWORK AND MAJOR TECTONO-THERMAL EPISODES OF NORTH CHINA: NEW INTERPRETATION OF "LLIANG OROGENY"[J].Earth Science-Journal of China University of Geosciences,2000,25(1):15-20. |
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| Authors: | Li Jianghai Qian Xianglin Hou Guiting Liu Shuwen Chen Jing |
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| Abstract: | The L liang
orogeny (1.9-1.7 Ga) has long been thought to have been responsible for the cratonization
of the North China craton (NCC). In fact, the NCC was dominated in the late
Palaeoproterozoic by an extensional-tectonic regime, associated with the development of an
aulacogen system, anorogenic magmatism (rapakivi granites, anorthosites, gabbros, granites
and pegmatites), with the emplacement of large-scale mafic dyke swarms and with the uplift
of the early metamorphic basement or the tectonothermal events of the retrogressive
metamorphism. The statistical analysis of the known isotopic age data of the late
Palaeoproterozoic to early Mesoproterozoic rocks suggests that several age peaks are
revealed by the chronological distributions of the magmatic emplacement and basement
tectonothermal events and that the uplift and retrogressive metamorphic events of the
craton basement lagged behind the magmatic emplacement, distinctively different from the
structural deformation-metamorphism-magmatic emplacement sequences characteristic of
orogenic belts. The re-understanding of the late Palaeoproterozoic extensional tectonic
framework clarifies the most basic restricting condition for the reconstruction of North
China craton within Rodinia in the Mesoproterozoic. |
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