Late Quaternary sedimentary evolution of the outer shelf of the East China Sea

摘要: Abstract This study investigated the late Quaternary sedimentary evolution of outer shelf East China Sea (ECS) using borehole core data (DH02). Three unconformity-bounded facies, namely, prodelta facies marine isotopic stage (MIS) 3, intertidal to subtidal flat deglacial period, and offshore tidal sand ridge Holocene, were identified from base upward according combined evidence lithology, microfossil assemblages, geochronology. Through comparative analysis with other neighboring cores, these three along MIS 3 nearshore last glacial maximum (LGM) river found constitute sediment strata. Sedimentary processes five interpreted based on a synthetic consideration sea-level change, climate variation, paleotopographic setting, paleoriver-sea interactions. In particular, development delta was attributable integration slow decline during later abundant supply resulting warm-wet climate. The gentle topography suggests presence shallow wide rivers in delta, lateral shift channels might have induced local formation at abandoned mouth. LGM which rarely observed (presumably due erosion transgression), inferred been deposited latter half response rise level. Occurrences imply tide-dominated estuary transgression. Furthermore, sediments reworked by enhanced currents front environment, forming mud ridges subsequent Formation environments Holocene uneven caused underlying estuarine ridges, this promoted occurrence depositional processes. association change constructed above-mentioned results. Overall, systematically elucidates ECS shelf, provides an insight into analogous shelves around world.