Grain-size features of aeolian sand on the east coast of Hainan Island and the revealed evolutionary processes of the sedimentary environment |
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Authors: | XiaoXia Liao Sen Li GuiYong Wang and ZhiLun Li |
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Affiliation: | Desheng School of Shunde No.1 Middle School, Foshan, Guangdong 528300, China;Institute of Resources and Environment Science, Foshan University, Foshan, Guangdong 528000, China;Institute of Resources and Environment Science, Foshan University, Foshan, Guangdong 528000, China;Department of Geography, South China Normal University, Guangzhou, Guangdong 510631, China |
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Abstract: | The Mudui stratigraphic section represents the typical records of sedimentation processes of sand dunes and interdune depressions on the east coast of Hainan Island.Based on high-density sampling and optically stimulated luminescence(OSL) dating of the strata of the section,the grain-size composition,grain-size parameters,cumulative distribution probability curve,and grain-size-sensitivity indexes(SC/D) were analyzed.The analyzed results show that the grain-size features of aeolian sand,weakly developed sandy paleosol,two-facies(aeolian and aqueous) deposits,and lagoon deposits are all different.This indicates four evolutionary phases of the sedimentary environment of the east coast of Hainan Island since 38 ka B.P.Phase I:38-22 ka B.P.;phase II:22-17 ka B.P.;phase III:17-10 ka B.P.;phase IV:10 ka B.P.-present.The climate experienced the hot-wet/hot-dry,hot-wet/hot-dry,and warm-wet/hot-wet fluctuations,and the sedimentary environment also underwent lagoon deposition,dune and interdune depression deposition,dune stabilization and soil development,shifting sand deposition,and evolutionary processes. |
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Keywords: | aeolian sand grain size grain-size-sensitivity index sedimentary environment east coast of Hainan |
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