

FOLLOWUS
1. Institute of Oceanology Chinese Academy of Sciences
2. First Institute of Oceanography State Oceanic Administration and Key Laboratory of State Oceanic Administration for Marine Sedimentology and Environmental Geology
3. China University of Geosciences,Wuhan
4. University of Massachusetts
5. Laboratory of Marine Geology Tongji University
网络首发:2013-09-07,
纸质出版:2013
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Sedimentary facies of the subaqueous Changjiang River delta since the late Pleistocene[J]. 海洋湖沼学报(英文), 2013,31(5):1107-1119.
Xu, T., Shi, X., Wang, G. et al. Sedimentary facies of the subaqueous Changjiang River delta since the late Pleistocene., Chin. J. Ocean. Limnol. 31, 1107–1119 (2013). https://doi.org/10.1007/s00343-013-2281-1
Sedimentary facies of the subaqueous Changjiang River delta since the late Pleistocene[J]. 海洋湖沼学报(英文), 2013,31(5):1107-1119. DOI: 10.1007/s00343-013-2281-1.
Xu, T., Shi, X., Wang, G. et al. Sedimentary facies of the subaqueous Changjiang River delta since the late Pleistocene., Chin. J. Ocean. Limnol. 31, 1107–1119 (2013). https://doi.org/10.1007/s00343-013-2281-1 DOI:
The sedimentary facies of the subaqueous Changjiang (Yangtze) River delta since the late Pleistocene was studied based on lithology and foraminifera analysis for two boreholes
CJK07 and CJK11
along with 14C dating. Four sedimentary facies were identified
namely fluvial
tidal flat
offshore
and prodelta facies. The fluvial sedimentary facies is comprised of fluvial channel lag deposits
fluvial point bar deposits
and floodplain deposits
showing a fining-upward sequence in general with no benthic foraminifera. A layer of stiff clay overlies the fluvial deposits in core CJK07
indicating a long-term exposure environment during the Last Glacial Maximum (LGM). During the postglacial sea-level rise around 13-7.5 cal ka BP
the tidal flat facies was deposited in core CJK11
characterized by abundant silt-clay couplets. Euryhaline species dominate the subtidal flat foraminiferal assemblages
while almost no foraminifera was found in the intertidal flat. The offshore environment was the major sedimentary environment when the sea level reached its highest level around 7.5 cal ka BP
with a maximum accumulation rate of 10 mm/a found in core CJK11. Prodelta sediments have been deposited in core CJK11 since ∼3 cal ka BP
after the formation of the Changjiang River delta. The difference in sedimentary facies between core CJK07 and CJK11 is due to their location: core CJK07 was in an interfluve while core CJK11 was in an incised valley during the LGM. Furthermore
AMS 14 C dating of core CJK07 shows poor chronological order
indicating that the sediments were reworked by strong tidal currents and that sediment deposited since ∼7.7 cal ka BP in core CJK07 was eroded away by modern hydrodynamic forces caused by the southward shift of the Changjiang River delta depocenter.
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