Study on the Ending Time of Late Mesozoic Tectonic Regime Transition in South China——Comparing to the Yanshan Area in North China
Study on the Ending Time of Late Mesozoic Tectonic Regime Transition in South China——Comparing to the Yanshan Area in North China
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发表时间：
2008
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通讯作者：
X. Guang-fu
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作者：
X. Guang-fu
目前的研究主要集中在中国东部中生代构造体制转换的过程及其相关的岩浆作用。福建是中国南部中生代多火山活动的地区之一。锆石SHRIMP U-Pb年龄表明，福建晚古生代南苑组广泛分布的火山岩的形成时间可分为两个时期：中侏罗世至晚侏罗世(162.3~149.8 Ma)和早白垩世(142.3~130.1 Ma)。根据区域构造和地层，福建两期火山岩属于不同的火山旋回和不同的构造背景。与中国北部的燕山期层序相比，前者相当于跳积山组，后者相当于张家口组，暗示两者分别形成于中国南部中生代晚期构造体制转换结束之前或之后。提出了中国南部中生代构造体制转换结束于晚侏罗世(149.8-142.3 Ma)，即中国南部和中国北部几乎同时结束的构造体制转换。
Current studies are focusing on the process and related magmatism of Mesozoic tectonic regime transition in eastern China.Fujian is one of the areas where multiple volcanic activities took place in South China during Mesozoic.Zircon SHRIMP U-Pb dating indicates that formation time of widespread volcanic rock of Late Paleozoic Nanyuan Formation in Fujian can be divided into two periods:middle Jurassic to late Jurassic(162.3-149.8Ma)and early Cretaceous(142.3-130.1Ma).Based on regional structure and stratigraphy,the two periods of volcanic rocks in Fujian belong to different volcanic cycles and different tectonic settings,so they can not be assigned into the same Formation.Compared with the Yanshanian sequences in North China,the former is equivalent to the Tiaojishan Formation and the latter the Zhangjiakou Formation,implying that both of them formed before or after the end of late Mesozoic tectonic regime transition in South China respectively.It was proposed that Mesozoic tectonic regime transition in South China ended in late Jurassic(149.8-142.3Ma),i.e.,the transitions ended at almost same time in both South China and North China.