Sedimentary facies of the subaqueous Changjiang River delta since the late Pleistocene

Taoyu Xu; Xuefa Shi; Guoqing Wang; Shuqing Qiao; Gang Yang; Shengfa Liu; Xuchen Wang; Quanhong Zhao

doi:10.1007/s00343-013-2281-1

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Sedimentary facies of the subaqueous Changjiang River delta since the late Pleistocene

Updated：2023-05-16

- Sedimentary facies of the subaqueous Changjiang River delta since the late Pleistocene
- Journal of Oceanology and Limnology Vol. 31, Issue 5, Pages: 1107-1119(2013)
- Affiliations：
  
  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
- Author bio：
- Funds：
- DOI：10.1007/s00343-013-2281-1
  CLC：
- Online First：07 September 2013，
  
  Published：2013
- Accepted：
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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：

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：

摘要

Abstract

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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references

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