The Cenozoic tectonic-sedimentary evolution characteristics of sedimentary basins in middle Western Pacific
He Lingyuan1, 2, Bao Zhidong1, 2, Qin Qin1, 2, Tian Zuoji3, Mao Shuwei1, 2, Song Jian1, 2, Zhang Yunyi1, 2, Deng Kun1, 2
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249; 2 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249; 3 PetroChina Research Institute of Petroleum Exploration &Development,Beijing 100083;
Abstract：The middle Western Pacific is characterized by the trench-arc-basin system,because it is located in the junction area of the Euro-Asia Plate,the Pacific Plate and the India Plate. Three different types of basins developed in this area,including fore-arc basins,back-arc basins and continental margin basins. Based on the comprehensive study of tectonic environment,formation and evolution of the basins,and sedimentary characteristics of the seventeen basins in this area,we made the following conclusions.(1)All types of basins have experienced four stages of tectonic-sedimentary evolution. The tectonic-sedimentarg evolution of fore-arc basins and back-arc basins can be divided into subduction stage(K2-E),basin-forming stage((Ｎ１１-Ｎ１3),subsidence stage(Ｎ１4-Ｎ１5)and compression stage(N2-Q): Volcanic rocks and metamorphic basement mainly developed in the subduction stage,with marine clastic rocks deposited in local areas. Marine sediments took dominance in the basin-forming stage,accompanied by volcanic activities and some local continental sediment. Marine facies and delta facies mainly developed in the subsidence stage and compression stage while local areas also developed fluvial and lacustrine facies in the latter stage. Meanwhile,that of continental margin basins can be divided into pre-rift stage(K2-E1),rift stage(E2-(E3１),depression stage(E32-Ｎ１3)and subsidence stage(Ｎ１4-Q): The continental alluvial fan-fluvial-lacustrine sedimentary system primarily developed in the pre-rift stage and rift stage,with intense volcanic activities. Depression stage is characterized by the evolution from continental facies to transitional facies. Marine facies and transitional facies both developed in the subsidence stage. (2)Different types of basins possess different features of tectonic-sedimentary evolution. The fore-arc basins are 3.6 km,meters thick on average,and their evolution were primarily controlled by compression and plate subduction,which experienced an evolution of marine-continental sedimentation-continental sedimentation. The back-arc basins are 4.8 km,meters thick on average,and their tectonic environments are controlled by subduction retreat and back-arc oceanic crust expansion which experienced an evolution of marine sedimentation-marine-continental sedimentation. The continental rift basins are more than 10 km thick on average with double fault structure,which experienced an evolution of continental sedimentation-marine sedimentation.
He Lingyuan,Bao Zhidong,Qin Qin et al. The Cenozoic tectonic-sedimentary evolution characteristics of sedimentary basins in middle Western Pacific[J]. JOPC, 2016, 18(3): 441-456.
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