Journal of Tropical Oceanography ›› 2020, Vol. 39 ›› Issue (5): 84-97.doi: 10.11978/2019112CSTR: 32234.14.2019112

• Marine Geology • Previous Articles     Next Articles

Sedimentary record from Core S05-2 and its implication of provenance and monsoon evolution in a muddy area of the inner shelf of the Southern East China Sea since 4870 a BP*

ZHANG Jie(), LI Qi()   

  1. School of Ocean Science, China University of Geosciences (Beijing), Beijing 100083, China
  • Received:2019-11-07 Revised:2020-03-13 Online:2020-09-10 Published:2020-03-19
  • Contact: Qi LI E-mail:2111160018@cugb.edu.cn;liqi@cugb.edu.cn
  • Supported by:
    Natural Science Foundation of China(41576066)

Abstract:

For better understanding of the sedimentary process and climate evolution in the East Asian continental shelves, we investigated the core sediments collected from the inner shelf of the East China Sea in terms of aspects of Accelerator Mass Spectrometry (AMS) radiocarbon dating, grain-size, clay minerals, and geochemical element concentrations. The studied sediments were deposited in the last 4870 a BP according to radiocarbon dating. The results show that silt is the dominant component of the sediments from the mud area of the East China Sea. The rivers on Taiwan Island contributed to the deposits in the studied area dominantly, whilst materials from the Yellow River and Yangtze River occurred episodically in the last 4870 a BP. The East Asian winter monsoon could be indicated by element ratio, sensitive grain-size and clay mineral content ratio. It suggests that the East Asian winter monsoon was stable, strengthening, weakening, and re-strengthening from 4870 a BP onward.

Key words: East China Sea inner shelf, mud area, provenance, monsoon, clay minerals, elements, grain size

CLC Number: 

  • P736.31