【摘要】 基于4 530km高分辨率单道地震数据和钻孔资料,采用高分辨率地震地层学的方法,对台湾海峡晚更新世以来的地层进行了划分,自上而下共识别出R0、R1、R2、R3、R4等5个主要反射界面,分别对应海底、3ka BP前后高海平面、最大海泛面、海侵面和Ⅰ型层序界面,并以此划分出4个地层单元:晚全新世浅海-滨海沉积A,中全新世浅海沉积B,早全新世海侵沉积C,晚更新世陆相河流沉积D。在海平面变化的作用下,海峡地区先后发育低水位沉积D(低位体系域),海侵沉积C(海侵体系域)、高水位沉积B和A(高位体系域)。研究了台湾海峡的典型地震相,提出了关于台中浅滩(云彰隆起)处的楔状沉积体的新观点,认为该楔状体为全新世中期以来形成的三角洲沉积受波浪和潮流作用改造而形成的潮流沙脊,其物质主要来源于台湾。识别出了晚更新世和早全新世古河道沉积,海平面变化和地势高低是其形成时间差异的主要因素。更多还原

【Abstract】 Based on 4530 km high resolution seismic data and core data,we divide the sequence stratigraphy in the Taiwan Strait since late Pleistocene,using the method of high resolution seismic stratigraphy.The main reflective interfaces R0,R1,R2,R3 and R4correspond to the seafloor,the high sea level at 3ka BP,the maximum flooding surface,the transgressive surface and the type I sequence boundary,respectively.And the depositional sequence includes four stratigraphic units:the late Holocene neritic-littoral deposits A,the middle Holocene shallow sea deposits B,the early Holocene transgression sediments C,and the late Pleistocene continental fluvial deposits D.In response to the sea level changes,the strait formed lowstand deposits(LST),transgression deposits(TST),and high-stand deposits(HST)in turn.Furthermore,typical seismic facies are studied,and a new viewpoint about the wedge at the Taichung shoal(Yunchang Rise)is proposed:the wedge is delta deposition,of which the sediments mainly come from Taiwan,formed since mid-Holocene,and transformed into a tidal sand ridge by combined waves and tidal currents.Besides,we identify the late Pleistocene and the early Holocene paleo-channel depositions,of which the forming time difference is mainly caused by sea level change and its topography.更多还原