首页> 中文期刊>地质学报 >华北克拉通对罗迪尼亚超大陆事件的响应——GOSEN连接假设

华北克拉通对罗迪尼亚超大陆事件的响应——GOSEN连接假设

     

摘要

The North China Craton (NCC) was clearly different from the Yangtze and Tarim cratons during the late Mesoproterozoic to early Neoproterozoic period because no distinct geological records have been found about the thermotectonic events related to assembly and breakup of the Rodinia Supercontinent. Therefore, various assumptions occur regarding relation between the NCC and the Rodinia. In recent years, some typical Grenville ages were successively yielded using the detrital zircons from the Yushulaiz Group in Liaoning, Penglai and Tumen groups in Yantai of Shandong, all of them belonging to the Neoproterozoic clastic strata distributing on both sides of the Tanlu fault. The data are similar to those from the Upper Riphean at the southeastern margin of Siberia Craton. The ages of these zircons are not characteristic of the NCC and Siberian craton, indicating that there is a close relation between the eastern margin of the NCC, the southeastern margin of Siberian craton, and the Grenville Orogen. On the basis of the assumption, we propose a hypothesis (GOSEN joining hypothesis) that the Grenville Orogen, the southeastern margin of Siberia and eastern NCC was linked.%中元古代晚期—新元古代早期的华北克拉通与塔里木、扬子克拉通存在明显差异,那里没有十分强烈的与罗迪尼亚超大陆汇聚及裂解有关的热构造事件的地质记录,因此对华北克拉通与罗迪尼亚超大陆的关联存在不同的推测.近年来,在郯庐断裂带两侧新元古代碎屑岩地层中,从辽宁的榆树砬子群,经山东烟台蓬莱群至土门群,陆续测得众多具经典格林威尔期的碎屑锆石年龄.这一信息与西伯利亚东南缘上里菲碎屑岩中的碎屑锆石年龄谱十分相似.这些碎屑锆石的时代均不是华北或西伯利亚本土所具有的特点,说明华北东缘、西伯利亚东南缘与劳伦大陆东南缘格林威尔造山带存在某种亲缘关系.根据这种推测,笔者等提出了劳伦大陆格林威尔造山带、西伯利亚东南缘和华北东部(GOSEN)连接的假设.

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