Material Sources And Sedimentary Environment Study Of Core DGKS9617

Piston core DGKS9617 (31° 18.58' N, 124° 26.437' E, water depth 57m, core length 851cm) locates on the edge of Yangtze Shoal, inner shelf of the East China Sea. It is a long piston core of this area. By comprehensively analyzing grain size, sedimentary structure, heavy mineral, major and trace element of this core, we discuss material sources and sedimentary environment of it.Core DGKS9617 records the paleo-climate and paleo-environment evolution of Mid-and Late-Holocene. Yangtze River provides most of the sediment. Its sedimentary environment changes from tidal shallow marine to shallow sea. Some Holocene climate fluctuations, such as Holocene Megathermal, subboreal phase and Mid-Holocene cold event are recorded obviously in this core.We also find that heavy minerals, carbonate, some trace elements and transitive metals, such as Fe, Mn, V, Cr, Ni, Cu, Zn are effective in discriminating the origin of the sediment, from Yangtze River or Yellow River? Some mineral and geochemical indexes are sensitive to the variation of the paleo-climate and paleo-environment. For example, the ratio of feldspar/quartz and the vertical content of natrium vary with the fluctuations of climate, and the change of Sr/Ba responds to the sea-level vibration.