38 ka以来海南岛东海岸风成沙的粒度特征及其反映的沉积环境演变过程

摘要/Abstract

摘要： 木堆地层剖面是海南岛东海岸沙丘与丘间地沉积过程的典型记录。在对该剖面地层高密度采样和光释光定年的基础上,对风成沙及相关沉积物的粒度组成、粒度参数和概率累积曲线及粒度敏感指标（SC/D值）的分析表明,风成沙、弱沙质古土壤、风水两相沉积物和泻湖相沉积物的粒度特征各异,反映38 ka BP来海南岛东海岸沉积环境经历了阶段Ⅰ（38～22 ka BP）、阶段Ⅱ（22～17 ka BP）、阶段Ⅲ（17～10 ka BP）、阶段Ⅳ（10 ka BP至今）等4个演变阶段,气候环境经历了暖湿-暖干-暖湿-暖干-暖湿-干凉-温湿-波动-暖湿的演变,沉积环境也经历了泻湖沉积-沙丘与丘间地沉积-沙丘固定成壤-流沙沉积的演变过程。

关键词: 风成沙, 粒度, 粒度敏感指标, 沉积环境, 海南岛东海岸

Abstract: The Mudui stratigraphic section is a typical record of the sedimentary process of sand dunes and the inter-lowland in the eastern coast of Chinas Hainan Island. Analyses to grain-size composition, parameters, cumulative probability curve and sensitive indexes (SC/D value) were conducted based on high-resolution sampling and OSL age determination. Results show that the grain-size features of eolian sands, immature sandy paleosol, sediments of Aeolian-water and lacustrine facies are different from each other. The sedimentary environment evolution in eastern coast of Hainan Island can be divided into four phases: 38~22 ka BP; 22~17 ka BP; 17~10 ka BP; 10 ka BP to present. Correspondingly, climate followed changes of hot-wet—hot-dry—hot-wet—hot-dry—hot-wet—dry-cool—warm-wet—fluctuation—hot-wet; semimetal environment followed changes of lagoon\_dune and inter-dune\_dune fixed for pedogenic environment\_shifting sand deposit.

Key words: grain-size, eolian sediment, Mudui stratigraphic section, sedimentary process

中图分类号:

P532

廖肖霞;李森;王贵勇;黎志伦. 38 ka以来海南岛东海岸风成沙的粒度特征及其反映的沉积环境演变过程[J]. 中国沙漠, 2009, 29(6): 1086-1092.

LIAO Xiao-xia;LI Sen;WANG Gui-yong;LI Zhi-lun. Grain-size Features of Aeolian Sands on Eastern Coast of Hainan Island and the Reflected Sedimentary Environment since 38 ka BP[J]. JOURNAL OF DESERT RESEARCH, 2009, 29(6): 1086-1092.

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