东海盆地西湖凹陷天台区始新世平湖组风暴岩的发现及其地质意义

doi:10.13278/j.cnki.jjuese.20190298

Abstract

Abstract: The tempestites are developed in Eocene Pinghu Formation in Tiantai area in Xihu sag,and the discovery of tempestites has great paleo-graphical and paleo-environmental significances. According to core observation, the storm-generated sedimentary structures are identified, including scouring-filling structure, storm tearing structure, and hummocky cross-stratifications, etc. Through analyzing the lithofacies and sedimentary structures, two types of tempestites, near source and far source, are distinguished. The near source tempestites show incomplete storm sedimentary sequence units, and are dominated by storm-generated grave layers(A)+mud beds(E), indicating sedimentary environment of subtidal zone of tidal flat; while the far source tempestites show incomplete or complete storm sedimentary sequence units, and are dominated by graded members (B)+parallel laminations (C)+hummocky cross-stratifications(D), indicating shallow near storm wave base environment. The sequential depositional evolution of tempestites is from shallow sea shelf to tidal flat upwardly. The discovery of tempesites in the study area provides an important basis for the research of the evolution of paleo-environment.

Key words: tempestites, sedimentary sequence unit, paleo-environment, Pinghu Formation, Xihu sag

CLC Number:

P534.53

He Yuping. Discovery and Geological Significance of Eocene Pinghu Formation Tempestites in Tiantai Area,Xihu Sag,East China Sea Basin[J].Journal of Jilin University(Earth Science Edition), 2020, 50(2): 500-508.

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Discovery and Geological Significance of Eocene Pinghu Formation Tempestites in Tiantai Area,Xihu Sag,East China Sea Basin

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