| 内蒙古阿拉善地区恩格尔乌苏缝合带二叠纪放射虫及其地质意义 |
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| 引用本文： | 谢 力,尹海权,周洪瑞,张维杰.内蒙古阿拉善地区恩格尔乌苏缝合带二叠纪放射虫及其地质意义[J].地质通报,2014,33(5):691-697. |
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| 作者姓名： | 谢 力 尹海权 周洪瑞 张维杰 |
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| 作者单位： | 1.中国地质大学（北京）博物馆, 北京 100083；
2.中国地质大学（北京）地球科学与资源学院, 北京 100083 |
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| 基金项目： | 中国地质调查局项目(编号:基[2010]矿评01-09-11) |
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| 摘 要： | 报道了采自恩格尔乌苏缝合带的蛇绿混杂岩硅质外来岩块中的二叠纪阿尔拜虫目放射虫化石,包括3属7种,可以划分为2个放射虫化石组合,能够与日本、美国的放射虫化石带进行对比,其地质时代分别为早二叠世和中二叠世晚期—晚二叠世早期。恩格尔乌苏缝合带位于华北板块和塔里木板块之间,这些放射虫化石的发现为研究恩格尔乌苏缝合带的构造演化提供了新的证据。鉴于其中最新的放射虫组合的地质时代为中二叠世晚期—晚二叠世早期,认为华北板块与塔里木板块之间自中二叠世晚期—晚二叠世早期曾经存在古海洋,即华北板块和塔里木板块的拼合时间是晚二叠世晚期。
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| 关 键 词： | 二叠纪 晚二叠世 放射虫 蛇绿混杂岩 恩格尔乌苏缝合带 内蒙古 |
Permian radiolarians from the Engeerwusu suture zone in Alxa area of Inner Mongolia and its geological significance |
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| XIE Li,YIN Hai-quan,ZHOU Hong-rui,ZHANG Wei-jie.Permian radiolarians from the Engeerwusu suture zone in Alxa area of Inner Mongolia and its geological significance[J].Geologcal Bulletin OF China,2014,33(5):691-697. |
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| Authors: | XIE Li YIN Hai-quan ZHOU Hong-rui ZHANG Wei-jie |
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| Institution: | 1. Geological Museum, China University of Geosciences, Beijing 100083, China;
2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | Details of Permian albaillellarians from the exotic siliceous blocks within the Engeerwusu ophiolitic mélange along the Engeerwusu suture zone are presented for the first time. Among them, seven species belonging to three genera were systemically investigated. Most species recorded can be correlated with the Permian radiolarian zones in Japan and the USA. Two radiolarian assemblages were distinguished, indicative of Early Permian and late Middle to early Late Permian respectively. On the basis of the deep-water settings indicated by the albaillellarian fauna, the radiolarians extracted from the exotic siliceous blocks within the Engeerwusu ophiolitic mélange along the Engeerwusu suture zone may provide new evidence for the tectonic evolution of the Engeerwusu suture zone between the North China Plate and the Tarim Plate. According to the deep-water setting indicated by the latest radiolarian assemblage of late Middle-early Late Permian epoch, the authors hold that an ocean existed between the North China Plate and the Tarim Plate during late Middle to early Late Permian, and the closure of the ocean between the North China Plate and the Tarim Plate might have occurred during late Late Permian period. |
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