The paleoenvironmental information of core YD0901 in the subaqueous Yangtze River delta since Holocene

Abstract:

Based on grain size, TOC and TN analyses of core YD0901, located in the subaqueous Yangtze River delta, we establish the Holocene high-resolution chronostratigraphy. The results show that the subaqueous delta was formed rapidly during 6~7ka (the Middle of Holocene Warm Period). Meanwhile, the mud areas of Fujian and Zhejiang were formed slowly. TOC and TN test data show that the content of TN increases around 2.7kaB.P., indicating the gradual increase of human activities in Yangtze River Basin. However, the content of TOC has not increased significantly because of the diagenesis. And the depth of MFS (34.22m) provides a reliable basis about the accurate estimation of the total amount of subaqueous delta since the post-glacial Maximum transgression.

Key words:Holocene; the subaqueous Yangtze River delta; sedimentation rate; TOC; TN