| 中国早前寒武纪的地壳演化 |
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| 引用本文：白瑾,戴凤岩.1994.中国早前寒武纪的地壳演化[J].地球学报,15(3,4):73-84. |
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| 中文摘要:以华北原地台为例，太古宙陆壳可能是由分散的陆核在涡旋构造机制的驱动下聚集而成的。早元古代伊始，板块构造机制控制了地壳演化的进程，出现不同性质的活动带同刚性地块并存的构造局。巨厚的火山-沉积建造，以其成岩环境和构造样式的多样性，宣告了一个新的地壳演化阶段的开始，明显具有太古宙克拉通基底的华北原地台、塔里木原地台和扬子原地台在它们的接触部位发育有早元在于代增生带，说明至少在太古宙末它们是互相分离的。而华夏古陆则是从早元古代以来逐渐向扬子原地台靠扰的。现代华北地台缘，早元古代建造近南北向的早期构造方位表明，它在早元在于代及其以前，可能同西伯利亚板块的基底是相连的。 |
| 中文关键词:前寒武纪 地壳演化 中国 |
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| The Early Precambrian Crust Evolution of China |
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| Abstract:With North China Protoplatform as an example,the Archaean continental crust might be made from the dispersed nuclei in operation of whirl tectonics 2.5Ga ago. From the beginning of the early Proterozoic the crust evolutional process was controlled by the plate tectonics.There emerged the tectonic regime of coexistence of mobile belts of different natures and rigid blocks.The diversity of tectonic setting and structural pattem pronouced a beginning of new epoch of curstal evolution. The North China Protoplatform,the Tarim Protoplatform and the Yangtze Protoplatform are considered to have separated from each other at least during the end of Archaean because of the early Proterozoic accretion zones developed between them.Whereas the Cathaysia had gradually closed with the Yangtze Protoplatform since the early Proterozoic time. The nearly N/S primary structural orientation of the early Proterozoic formation in the northern nargin of the modern North China platform indicates that North China Protoplatform had been connected with Siberian craton,during and before early Proterozoic times. |
| keywords:early Precambrian crust evolution China |
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