TROPICAL GEOGRAPHY ›› 2016, Vol. 36 ›› Issue (3): 406-416.doi: 10.13284/j.cnki.rddl.002845

Previous Articles     Next Articles

Late Quaternary Sediment Stratigraphy and Marine Cycles in the Pingtan Island, Fujian Province

CHEN Cong1,WAN Qiuchi1,ZHENG Zhuo1,YU Fengling2,3,A SWITZER2,WAN Yixing1   

  1. (1. School of Earth Science and Geological Engineering,Sun Yat-sen University,Guangzhou 510275,China; 2. Earth Observatory of Singapore,Nanyang Technology University,Singapore 639798,Singapore; 3. College of Ocean and Earth Science,Xiamen University,Xiamen 361005,China)
  • Online:2016-05-05 Published:2016-05-05

Abstract: A 28.3 m long core, PT01, from the Pingtan Island, Southeast China, is selected to be studied. Radiocarbon dating (AMS 14C) and optical stimulated luminescene (OSL) are used for establishing chronology. Combining age-dating results with marine microfossil and color index, we classify the Late Quaternary sediment stratigraphy in the coastal region of Fujian Province. It is suggested that the late Pleistocene marine deposit, dated back to 124 ka, and abundant marine microfossil (e.g. foraminifer and ostracods), would belong to the Marine Isotope Stages 5(MIS 5). Moreover, the late Quaternary sediment could be divided into three units based on the analysis of lithology, microfossil, grain size and color index. Our results reveal that the sediment environment during the MIS 5 was significantly controlled by global sea level change which varied among coast, tidal flat, lagoon, and eolian sand, and probably there existed weathering process. A hiatus during the last glacial (MIS 2-4) was attributed to low relative sea level. And the Holocene deposit, as thick as 3.79 m, developed poorly and was mainly comprised of swamp facies and eolian dune.

Key words: the Pingtan Island, Late Quaternary, sediment environment, marine cycles, MIS 5