Search
E-mail
RSS

Online submission Editor-in-chief Peer review Staff Login

Journal of Tropical Oceanography ›› 2015, Vol. 34 ›› Issue (2): 52-65.doi: 10.11978/j.issn.1009-5470.2015.02.007CSTR: 32234.14.j.issn.1009-5470.2015.02.007

• Marine Geology • Previous Articles     Next Articles

Records of melt water pulses and climate events from the northern South China Sea since late Last Glacial Maximum: Implication of terrigenous input

MAO Sheng-yi1, 4, ZHU Xiao-wei2, 4, WU Neng-you1, 4, SUN Yong-ge3, GUAN Hong-xiang1, 4   

  1. 1. Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;
    2. Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;
    3. Department of Geosciences, Zhejiang University, Hangzhou 310027, China;
    4. Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China
  • Received:2014-08-19 Revised:2014-09-16 Online:2015-04-10 Published:2015-04-12

PDF (PC)

Like

Cited

5 | 4

Abstract: The distribution and δ13C composition of long chain n-alcohols from the late Last Glacial Maximum (LGM) to the Holocene in Site 4B core sediments from the continental slope of the northern South China Sea was discussed in this paper. The distribution of carbon preference index (CPI, 10.49~24.56), average chain length (ACL, 28.91~29.99) and average carbon isotope (-28.85‰±0.97‰ to -32.92‰±1.38‰) of long chain n-alcohols reflected a C3 higher plant source and a dominated terrigenous input of organic materials into the sediments. The relatively low terrigenous input was related to the extensive melt water pulse (MWP) events (19ka-MWP, MWP-1A and MWP-1B), and Bølling-Allerød (B/A) warming event from the end of the LGM to the end of the Late Pleistocene in Site 4B sediments (65~102cm, 19.343 to ~ 11.636 ka BP) without glacial period/interglacial period cycle. However, the distribution of the terrigenous input reflected intensified/weakened winter monsoon/summer monsoon cycle during the late LGM and Holocene, with the winter monsoon maximum periods recorded during the late LGM and the summer monsoon maximum periods in about 9.940ka BP. Compared with the cycle climate change of global glacial period/interglacial period, the distribution of the terrigenous input from the end of the LGM to the end of the Late Pleistocene in Site 4B sediments (19.343 to ~ 11.636 ka BP) reflected ambiguous regional comparability, probably related to the regional environmental activity in low latitudes.