| 上扬子海南缘晚奥陶世赫南特期沉积相特征及海平面变化 |
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| 关键词:sedimentary characteristics sea-level fluctuation Guanyinqiao Member southern margin of the Upper Yangtze Sea Hirnantian Upper Ordovician |
| 基金项目:国家自然科学基金(编号: 41762001);沈阳师范大学博士、引进人才科研项目启动基金(编号: BS201701);中国科学院资源地层学与古地理学重点实验室开放课题(编号: 2016KF03) |
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| Sedimentary Facies Features and Sea-level Fluctuation during the Upper Ordovician Hirnantian Period on the Southern Margin of the Upper Yangtze Sea |
| Hirnantian period of Upper Ordovician experienced sea level falling and decreasing temperature caused by Gondwana glacial event, resulting in mass extinction event. It was also a transition stage of structural evolution and sedimentation. It is thus proved to be one of important transition periods of geological event in geological history. Based on the research on lithologic combination, paleontology, and sedimentary structure of the outcrop of Guanyinqiao Member of Wufeng Formation on the southern margin of the Upper Yangtze Sea, whose margin experienced three types of sedimentary facies transformation, i.e., coastal tidal flat facies, shallow facies and shallow sea shelf facies. Coastal tidal flat facies were mainly mixed tidal flat, and distributed in the Yunnan–Guiyang–Guangxi ancient continental margin and the underwater uplift of Guizhou. Shallow facies was distributed in Xiushan of Chongqing, Songtao of Guizhou and Fenggang of Guizhou, located in near tidal flat zone as well as on bioclast beach and clast beach. Shallow sea shelf facies is in contact with coastal tidal flat facies and extends northward, and can be divided into lower shallow shelf and upper shallow shelf. Among these shelves, upper shallow shelf can be subdivided into shallow mixed shelf and shallow clast shelf. In addition, li-thological association and biodetritus features indicate that there existed at least one complete sea-level change, which supplied new materials for global sea-level change. |
| ZHAO Ming-sheng,WANG Yue.2018.Sedimentary Facies Features and Sea-level Fluctuation during the Upper Ordovician Hirnantian Period on the Southern Margin of the Upper Yangtze Sea[J].Acta Geoscientica Sinica,39(2):189-200. |
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