| 辽东岫岩地区下古生界碎屑锆石定年:罗迪尼亚和冈瓦纳超大陆在华北遗留的痕迹？ |
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| 引用本文： | 董晓杰,陈煜嵩,刘正宏,徐仲元,沙茜.辽东岫岩地区下古生界碎屑锆石定年:罗迪尼亚和冈瓦纳超大陆在华北遗留的痕迹？[J].岩石学报,2020,36(6):1857-1869. |
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| 作者姓名： | 董晓杰 陈煜嵩 刘正宏 徐仲元 沙茜 |
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| 作者单位： | 吉林大学地球科学学院, 长春 130061;自然资源部东北亚矿产资源评价重点实验室, 长春 130061 |
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| 基金项目： | 本文受国家自然科学基金项目（41872203）和中国地质调查局项目（1212011220247、DD20190159-19）联合资助. |
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| 摘 要： | 超大陆演化是地质研究的重要内容,华北克拉通与不同地质历史时期超大陆汇聚与裂解的联系对反演华北克拉通构造演化历史具有重要意义。本文在辽吉古元古代造山带中段的原划分为辽河群地层中首次识别出一套早古生代沉积建造。这套沉积建造与华北克拉通以浅海相的碳酸盐岩为主的早古生代沉积并不一致,以发育大量的陆源碎屑沉积为特征。我们对2件细砂岩分别进行了锆石LA-ICP-MS和SHRIMP U-Pb定年。定年结果显示,2件样品的最小年龄分别为～482Ma和～498Ma,反映了它们的最大沉积时代。2件样品的碎屑锆石年龄主要介于1600～500Ma,缺乏亲华北的物源信息,表明它们的物源主要来自于华北之外。2件样品年龄谱中最重要的峰值出现在格林威尔期和泛非期,表明华北克拉通曾与罗迪尼亚超大陆和冈瓦纳大陆存在联系。格林威尔期碎屑锆石可能来自于罗迪尼亚超大陆时期波罗地古陆物质在华北克拉通东缘的再循环;泛非期碎屑锆石可能来自于东冈瓦纳大陆的北缘造山带。
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| 关 键 词： | 华北克拉通 辽东 冈瓦纳 罗迪尼亚 碎屑锆石 |
| 收稿时间： | 2020/3/21 0:00:00 |
| 修稿时间： | 2020/4/13 0:00:00 |
Detrital zircons dating of Lower Paleozoic from the Xiuyan area of eastern Liaoning: Traces of the Rodinia and Gondwana supercontinents in the North China Craton? |
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| DONG XiaoJie,CHEN YuSong,LIU ZhengHong,XU ZhongYuan,SHA Qian.Detrital zircons dating of Lower Paleozoic from the Xiuyan area of eastern Liaoning: Traces of the Rodinia and Gondwana supercontinents in the North China Craton?[J].Acta Petrologica Sinica,2020,36(6):1857-1869. |
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| Authors: | DONG XiaoJie CHEN YuSong LIU ZhengHong XU ZhongYuan SHA Qian |
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| Institution: | College of Earth Science, Jilin University, Changchun 130061, China;Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Changchun 130061, China |
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| Abstract: | The supercontinent evolution is an important part of geological research. The relationship between the North China Craton (NCC) and the supercontinents in different geological periods is of great significance to the inversion of the tectonic evolution history of the NCC. This paper identifies for the first time a set of the Early Paleozoic sediments in the original Liaohe Group in the middle part of the Liao-Ji Belt. The sediments are not consistent with the Early Paleozoic strata in the NCC, which are dominated by the carbonate rocks of the shallow marine facies. The sediments are characterized by a large number of terrigenous clastic depositions. Zircon LA-ICP-MS and SHRIMP U-Pb were respectively dated for two fine sandstones. Dating results showed that the minimum ages of the two samples were 482Ma and 498Ma, which represents the earliest deposition time. The detrital zircons of the two samples are mainly between 1600Ma and 500Ma in age, and short of provenance information related to the NCC. These indicate that their provenance is mainly from outside of the NCC. The most important peaks in the age spectrum of the two samples appeared in the Grenvillian and the Pan-African, indicating that the NCC was once associated with the Rodinia supercontinent and the Gondwana continent. The Grenvillian detrital zircons probably came from the recirculation of the continental materials from Baltic on the Rodinia supercontinent in the eastern margin of the NCC. The Pan-African detrital zircons may come from the northern margin orogenic belt of the eastern Gondwana continent. |
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| Keywords: | North China Craton Eastern parts of Liaoning province Gondwana Rodinia Detrital zircon |
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