Depositional sequences on a late Pleistocene-Holocene tropical siliciclastic shelf (Sunda Shelf, southeast Asia)

摘要: This study describes, and reviews, the stratigraphic architecture of world's largest but least known tropical siliciclastic shelf using sequence-stratigraphic concept. The Sunda Shelf provides conditions particularly suited for reconstructing its depositional history due to a low gradient extreme width, presence huge paleo-valley systems abundant filled channels, tectonic stability during Quaternary, high sediment input large catchment area. We investigated subsurface along most prominent by shallow-seismic surveying 36 gravity cores controlled 80 radiocarbon dates. deposits sea-level fall prior last glacial maximum lowstand subsequent deglacial rise correspond four tracts: (a) wide, partly detached prograding deltaic clinoforms indicate forced regression related regressive tract; (b) sparse shoreline widespread soil formation refer (c) rapidly backstepping coastline-related form confined transgressive tract without stacking patterns are mainly restricted system; (d) thin marine mud cover extends as condensed section over whole area (the base highstand tract). on central strata past 50,000 years is result interplay three major factors: (1) rapid changes, (2) locally pronounced physiography (3) changes in supply that determined distribution accumulation pattern. (C) 2003 Elsevier Ltd. All rights reserved.