PALEO-COASTLINE CHANGES IN SOUTH CHINA SEA IN SOME CRITICAL TIMES
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摘要: 整个南海新生代的演变可概括为一系列微板块在太平洋板块与印度洋板块运动影响下发生拉薄、裂解、滑移、旋转、会聚和碰撞的过程,特别是经过55、33、25、16、6、2 Ma关键时期的演化,最终形成现在具有陆架和深水海盆特征的西太平洋最大边缘海。依据南海内部各坳陷盆地的最新研究进展,包括海相边缘沉积相类型、古水深、钻井资料等能够依次重建南海特殊历史时期的古岸线位置,分析其变迁规律,并与古新世、始新世之交的高温事件,始新世末-渐新世初全球气候变冷事件,渐新世-中新世全球变冷、海平面下降事件,中中新世早期气候回暖、全球海平面上升事件,上新世早期全球变暖事件,晚上新世北极冰盖形成等系列事件进行对比,从而进一步了解古新世以来南海的环境演变过程。Abstract: The evolutionary history of South China Sea can be summarized as a series of events of micro-plate pulling and thinning, cracking, slipping, rotation, convergence and collision under the influence of the movement of the Pacific Plate and the Indian Ocean Plate, through some critical evolutionary periods as 55 Ma, 33 Ma, 25 Ma, 16 Ma, 6 Ma, 2 Ma. There are lack of studies on long term sea-level changes and coastaline changes in the region of SCS. Based on the study of coastal depositional facies and paleobathymetry from the drilling data of SCS basins, we reestablished the paleocoastal line for each critical geological time since Paleocene. Comparison was made with the coastaline changes in the periods of Paleocene-Eocene thermal maximum, Eocene -Oligocene global climate cooling event, Oligocene-Miocene global cooling, sea-level fall event, Middle Miocene climate warmer global sea level rise events, Early Pliocene global warming event, Late Pliocene Arctic ice cap formation event. Environment evolution of the SCS since Paleocene is further described.
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