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A Possible Tsunami Deposits in the Lower Part of the Devonian Xiejingsi Formation in the East Yangtze Gorges Area
Author(s): ZENG Xiong-wei, ZHOU Peng, LIU An, WANG Jian-po, DU Yuan-sheng, Wuhan Institute of Geology and Mineral Resources, State Key Laboratory of Biogeology and Environmental Geology
Pages: 816-
822
Year: 2014
Issue:
5
Journal: Acta Sedimentologica Sinica
Keyword: the East Yangtze Gorges area; Xiejingsi Formation; calcirudite; Frasnian-Famennian; tsunami deposition;
Abstract: One or more suits of thin-medium bedded calcirudites widely distribute in the Devonian Xiejingsi Formation in the East Yangtze Gorges area. Through detailed study of the Changliangzi section in Jianshi county,Yuxiakou section in Changyang county and Guanzhuang section in Yichang city,we found that daisy-like structure developped in the upper gravels,which undoubtedly belongs to storm deposition. In contrast,inversely directed imbrications developed in the lower gravels. Combined with the lateral facies changes and the spatial distribution,we inferred that the lower gravels may represent the global tsunami deposition in the continental margin across the F-F transition,which could be caused by bolide impacts into ocean.
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