| 印支运动及其在中国大地构造演化中的意义 |
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| 引用本文：任纪舜.1984.印支运动及其在中国大地构造演化中的意义[J].地球学报,6(2):31-44. |
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| 中文摘要:<正> J.Fromaget将印度支那的晚三叠世褶皱称为“印度支那褶皱”(Indosinides)。黄汲清在《中国主要地质构造单位》一书中把中生代初期的造山运动称为印度支那运动(简称印支运动),提出印支旋回的术语。他认为:“印支运动不仅在印度支那和华南有其重要意义,在亚洲其它部分亦然。但由于这个运动被较晚的、压倒一切的燕山运动所隐蔽,要研究出它的性质和分布范围,尚需多年的努力。” 现在,实践已经充分证实了黄汲清的科学预见。新中国成立后,由于地质调查、矿产普查和地质科学研究工作的开展,印支运动的广泛存在及其重要意义已逐步被中、外地质学家所认识和接受。 |
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| THE INDOSINIAN OROGENY AND ITS SIGNIFICANCE IN THE TECTONIC EVOLUTION OF CHINA |
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| Abstract:The Indosinian cycle refers to a tectonic stage ranging in age from the Late Permian to the beginning of Jurassic. The In dosinianorogeny took place during the late Middle Triassic to the early Early Jurassic, and it indicates the first intense compression-shear process occurring between the Pacific or and Tethyan Ocean and the Asian continent.Within the Marginal-Pacific Tectonic Domain, the Indosinian orogeny not only folded the Indosinian geosyncline along the eastern margin of the Asian mainland, but also reactivized the continental crust of Eastern China, resulting in folding and overthrusting of basements and covers accompanied by magmatism and mineralization. The Indosinian orogeny closed the North Tethys-Qinling-Songpan-Garze-Sanjiang and its southern extension (Indochina Geosynclines), giving rise to the greatest Indosinian fold system in the world. In the western section of the Central Asian-Mongolian geosyncline, only simple shearing appeared, resulting in nearly horizontal overthrusting, while in the eastern section, strong folding and thrusting, and large-scale magmatism came into being. This was the result of the overprinting of the Marginal Pacific Tectonic Domain upon the Pal-Asian Tectonic Domain.The Indosinian orogeny is of great significance in tectonic development of China and the adjacent countries. It made a final conjunction of the three different continental segments (Yangtze,Sino-Korean and Siberian) in East Asia. It is noted that between the Siberian and Sino-Korean platforms (Central Asian-Mongolian fold system), and between the Sino-Korean and Yang tze paraplatforms (Qinling fold system) occurred strong folding and over-thrusting, and as a result, the earth's crust was further imbricated and shortened. Within the Marginal-Pacific Tectonic Domain, the Indosinian tec-tonism represents the beginning of intense activity of the Bennioff zone in the west Pacific Ocean. Since then, the greater part of eastern China has become reactivized belts of continental margins of the Circum-Pacific. Within the Tethys-Himalayan Tectonic Domain, this orogeny gave rise to a gradual closing of the geosynclinal belt situated in North Tethys, while its south belt,i. e. the Bangong Lake-Nujiang belt and Tethys proper, known as the Yarlung Zangdo River, was further spread and stretched towards the west. And at last Pangea splitted up step by step. In the beginning of Jurassic, Gondwanaland was entirely separated from Laurasia by the Tethyan Ocean.From the point of view of global tectonics, the Indosinian orogeny is also of great importance. It was during the Indosinian cycle that Pangea and Pacifica began to disintegrate; E. suess' Tethys took its original shape; the Pacific tectonic belt showed intense activity. And it was the very Indosinian tectonism that determined the fundamental framework of global tectonics since Meso-Cenozoic times. Therefore, the Indosinian orogeny should be considered as a great turning point in the history of the tectonic development of the earth's crust. |
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