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Devonian sea-level change rhythms in South China and Coupling Relationships Among the Earth-spheres

Acta Geologica Sinica(English Edition) 1997年第4期71卷 370-385页

作者： Gong Yiming,Faculty of Earth Science, China University of Geosciences, Wuhan,Hubei, 430074Wu Yi,Guangxi Institute of Geology, Nanning, GuangxiDu Yuansheng, Feng Qinglai and Liu BenpeiChina University of Geosciences, Wuhan, Hubei, 430074 Faculty of Earth Science China University of Geosciences Wuhan Hubei 430074 Guangxi Institute of Geology Naming Guangxi China University of Geosciences Wuhan Hubei 430074 [?]Gong Yiming Born in October 1958 graduated from the Department of Geology Wuhan College of Geology in 1981 received his Ph.D. degree in China University of Geosciences (Wuhan) in 1991. He is now a professor of that university and mainly engaged in sedimentary geology of Chinese orogenic belts ichnology (trace fossils) and sequence stratigraphy.

Twenty orthosequences and their corresponding sea-level change (SLC) cycles have been recognized in the Devonian overlying the Caledonian unconformity, of which 9, 5.5 and 5.5 occurred in the Lower, Middle and Upper Devonian respectively. They can be grouped into 4 orthosequence sets, in which the maximum flooding surfaces lie in the sulcutus Zone (D12), perbonus Zone (D13), Middle and Upper varcus Zone (D22) and gigas Zone (D21) respectively. Four instant palaeogeographical reconstructions of South China have been made in the Emsian and Givetian. Devonian sea-level change rhythms of South China can be divided into 3 categories: the autorhythmic, the worldwide and regional allorhythmic, and the coupling-rhythmic. They developed respectively in the Famennian, Pragian, Eifelian, Lochkovian, Emsian, Givetian, Frasnian and the F / F (between the Frasnian and Famennian) event. The cause of the worldwide allorhythmic SLC of the Pragian and Eifelian under comparatively dry, warm and tranquil conditions may be related to the pulsating expanding and contracting of the oceanic basin volume or the earth volume pulsation, rather than the common glaciation and plate tectonism. The coupling-rhythmic SLC related to the F/ F event is a sensitive indicator of the interaction between terrestrial and extraterrestrial factors, and coordinated action among the earth-spheres.

关键词： sequence stratigraphy sea-level change rhythm coupling among the earth-spheres instant palaeogeographical reconstruction Devonian South China

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