Jurassic Tectonic Revolution in China and New Interpretation of the “Yanshan Movement”
Jurassic Tectonic Revolution in China and New Interpretation of the “Yanshan Movement”
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DOI：
10.1111/j.1755-6724.2008.tb00583.x
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发表时间：
2008-04
期刊：
影响因子：
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通讯作者：
Dong Shuwen;Zhang Yueqiao;L. Changxing;Y. Zhenyu;Ji Qiang;W. Tao;Huo Jianming;Chen Xuanhua
中科院分区：
文献类型：
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作者：
Dong Shuwen;Zhang Yueqiao;L. Changxing;Y. Zhenyu;Ji Qiang;W. Tao;Huo Jianming;Chen Xuanhua
摘要：随着新的构造地质调查资料和高分辨率同位素测年资料的获得和积累，我们对中国东部晚侏罗世-早白垩世构造事件的认识有了很大的提高，对“燕山运动”的性质、时间和地球动力学背景有了新的认识。中晚侏罗世（165±5 Ma），东亚板块拼合运动学发生重大调整，构造体制发生重大转变，开创了以华北地块为中心，不同板块从北、东、西南向其汇聚的新构造体制，形成了以陆内俯冲造山为特征的“东亚汇聚”构造体系。因此，东亚大陆的地壳岩石圈在晚侏罗世显著增厚，紧接着是早白垩世岩石圈显著减薄和克拉通破坏，岩石圈剧烈伸展和广泛的火山-岩浆活动，导致了从燕辽生物群到热河生物群的重大生物更替。发生在中国大陆和东亚地区的这一巨大构造事件是“燕山运动”的基本内涵。本文根据燕山运动的变形模式、动力学背景和深部过程，将燕山运动重新定义为晚侏罗世东亚板块多向会聚构造体制及其伴随的大规模陆内造山和大规模构造变动，其时间为165±5 Ma。中国东部岩石圈的显著衰减被认为是燕山期陆内造山变形的后期效应。
Abstract: With acquisition and accumulation of new data of structural geological investigations and high‐resolution isotopic dating data, we have greatly improved our understanding of the tectonic events occurring in eastern China during the period from the Late Jurassic to Early Cretaceous and may give a new interpretation of the nature, timing and geodynamic settings of the “Yanshan Movement”. During the Mid‐Late Jurassic (165±5 Ma), great readjustment of plate amalgamation kinematics took place in East Asia and the tectonic regime underwent great transformation, thus initiating a new tectonic regime in which the North China Block was the center and different plates converged toward it from the north, east and southwest and forming the “East Asia convergent” tectonic system characterized by intracontinental subduction and orogeny. As a consequence, the crustal lithosphere of the East Asian continent thickened considerably during the Late Jurassic, followed immediately by Early Cretaceous substantial lithospheric thinning and craton destruction featured by drastic lithospheric extension and widespread volcano‐magmatic activities, resulting in a major biotic turnover from the Yanliao biota to Jehol Biota. Such a tremendous tectonic event that took place in the continent of China and East Asia is the basic connotation of the “Yanshan Movement”. In the paper, according to the deformation patterns, geodynamic settings and deep processes, the “Yanshan Movement” is redefined as the Late Jurassic East Asian multi‐directional plate convergent tectonic regime and its associated extensive intracontinental orogeny and great tectonic change that started at ˜165±5 Ma. The substantial lithospheric attenuation in East China is considered the post‐effect of the Yanshanian intracontinental orogeny and deformation.