Reconstruction of Ocean Plate Stratigraphy from the ancient orogen
Cui Hui-Qi1,2, Xu Shu-Mei1,2,3, Li San-Zhong1,2,3, Shu Peng-Cheng1,2, Ma Hui-Lei1,2, Kong Jia-Hao1,2
1 Key Lab of Submarine Geosciences and Prospecting Techniques,Ministry of Education, Ocean University of China, Shandong Qingdao 266100,China;
2 College of Marine Geosciences,Ocean University of China,Shandong Qingdao 266100,China;
3 Institute of Advanced Oceanography/Frontiers Science Center for Deep Ocean Multispheres and Earth System, Shandong Qingdao 266100,China
The paper focuses on reconstruction of the Oceanic Plate Stratigraphy (OPS)from the Precambrian accretionary complexes and mélange of ancient orogenic belts,including the Pacific OPS reconstructed from the Neoproterozoic Mona Supergroup mélange in Anglesey,Wales,United Kingdom,and the Paleo-Indian OPS reconstructed from the Early Archean Cleaverville greenstone belt,Pilbara,northwest Australia. The early Archean basalt-silicate-clastic sequence in the Marble Bar area of the East Pilbara Block of Australia is highly similar to the Permian-Triassic ocean plate strata of Japan in rock composition and geochemical characteristics. This conclusion will provide strong support for evolution of the sedimentary environments of the early Archean OPS from the high-heat flow ridge spreading area,through the hot spot,to the low-heat flow trench,terrigenous clastic depositional zone. According to the rock records of the OPS in the accretive orogenic belt,the main composition and rock types of the OPS strata from the Archean to the present are similar. Therefore,the processes of ocean spreading,deposition,subduction and accretion have not changed significantly during the Earth's 3.8-byr-history. However,the oceanic plate properties and the oceanic plate stratigraphic composition of young orogenic belts may have changed with time. Precambrian mantle temperature was slightly high,and the degree of partial melting was high in the Archean. The melting amount greatly exceeded the expansion rate of the ocean crust,so the sheet dike group did not form in ancient oceanic crust.
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