A preliminary study on sediment flux in the Changjiang Delta during the postglacial period |
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Authors: | Email author" target="_blank">Baohua?LiEmail author Congxian?Li Huanting?Shen |
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Institution: | 1. Key Laboratory of Marine Geology, Ministry of Education of China, Tongji University, Shanghai 200092, China 2. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China |
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Abstract: | The sequence boundary and maximum flooding surface of the postglacial transgressive cycle in the Changjiang Delta have been
identified by 265 cores. Based on these data, the sediment amounts and the thickness-isopach maps of postglacial sedimentary
cycle, transgressive and regressive successions in the Changjiang Delta have been worked out. The results show that the sediment
amounts of the postglacial cycle, transgressive succession and regressive succession are 17742.2 × 108 tons, 9791.9 × 108 tons and 7950.3 × 108 tons, respectively. The postglacial sediments deposited in the incised valley are more than those in the two flanks, and
the sediments contained in the transgressive succession are more than those in the regressive succession. The postglacial
sediments deposited in the southern flank are more than those in the northern flank, and the sediments in the area seaward
from the postglacial transgression maximum (PTM) of each flank are more than those in the area landward from the PTM. Considering
both the possible changes of the ratio between the sediment amount remained in the modern Changjiang Delta and the sediment
discharge of the Changjiang River in the postglacial period, and the changes of the sediment discharge, the authors believe
that in the postglacial period, the sediment discharge of the Changjiang River is (2.36–4.86) × 108 tons/a on average, totaling to (35400–70800) × 108 tons, and the sediments delivered to sea and adjacent coasts are (1.18–3.54) × 108 tons/a on average, totaling to (17700–53100) × 108 tons. |
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Keywords: | postglacial transgressive cylce the Changjiang River the Changjiang Delta sediment flux transgressive succession regressive succession |
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