Holocene depocenter shift in the middle-lower Changjiang River basins and coastal area in response to sea level change

摘要: Authors collected 38 sedimentary boreholes and numerous seismic profiles from previous publications to delineate the Holocene sedimentation rate of six major depositional sinks in middle-lower Changjiang River basins its river coast. The results demonstrate that highest ca. 15 m/ka occurred mono-depositional sink former mouth during 10 000–8000 aBP, when post-glacial transgression happened water level remained at lower stand. With rising response sea rise, Jianghan Basin middle becomes other important with since 7000 aBP. As was mostly filled up 4000 Dongting valley trapped sediments great amounts like mouth. A considerable amount has been delivered, both eastward southward, inner continental shelf East China Sea, especially after 2000 This indicates reduced sediment storage capacity In total, 1307.4 billion tons have deposited floodplain meantime, 947 coast form subaqueous delta Zhejiang-Fujian along-shelf mud wedge. Our result also reveals two time stages rates(< 4 m/ka) all 8000–7000 aBP estuarine area 4000–2000 probably owing stengthened chemical weathering decline monsoon precipitation.