期刊
QUATERNARY INTERNATIONAL
卷 349, 期 -, 页码 245-251出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.quaint.2014.08.026
关键词
Sanjiang Plain; Wetlands; Grain-size component; Asian monsoon; Holocene
资金
- National Basic Research Program [2012CB956100, 2013FY111800]
- National Natural Science Foundation of China [41201083, 41271209]
- Knowledge Innovation Program of Chinese Academy of Science [KZCX2-EW-319]
Compared to the well-studied the grain-size depositional process in hydraulic and aeolian sediments, the process in wetlands is still poorly understood. In this study, the grain-size components of a well-dated mud/peat profile (SJ2) in the Sanjiang Plain were partitioned using a lognormal distribution function. The results suggest that the lacustrine deposits contain four distinct unimodal grain-size distributions, C-1 through C-4, with their modal sizes ranging 0.7-1.6, 2.4-8.7, 15.7-27.8, and 380.2-529.6 mu m respectively. Only the C-1 and C-3 were identified in the peat layers. A grain-size depositional modal was introduced to explain the environmental meanings of the four components. C-3, as a nearshore suspension component, was the most sensitive component to the variation of local hydraulic conditions. Based on the variation of C-3 percentages of the profile SJ2, the local hydraulic conditions were tentatively reconstructed, and the results showed a close relation with the monsoon variations during the Holocene. Accordingly, we suggest the relative coarse component of the polymodal peat deposits in monsoonal regions can be used as a sensitive indicator for the hydraulic conditions and the monsoon circulations in the geological past. (C) 2014 Elsevier Ltd and INQUA. All rights reserved.
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