Coastal plain evolution in southern Hainan Island, China |
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Authors: | WANG YingMARTINI IPeter ZHU Dakui ZHANG Yongzhan & TANG Wenwu |
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Institution: | 1 Key Laboratory of Coast & Island Development of Ministry of Education of China, Dept. of Geo & Ocean Sciences, Nanjing University, Nanjing 210093, China; Department of Land Resource Science, University of Guelph, Guelph, ON. Canada |
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Abstract: | The coast of southern Hainan Island is characterized by wide sandy embayments, which consist of ( i) drowned valleys bounded by steep bedrock hills and only locally receiving sediments, and embayments of various dimensions covered either by (ii) alluvial-deltaic deposits or by (iii) sands of coastal beach ridges/barriers and associated elongated lagoons. During the late Tertiary-Pleistocene the area has experienced isostatic and eustatic movements associated with neotectonics and climatic changes. Such history isrecorded in terraces at various altitudes (SO, 40, 20 m asl) and sequences of coastal sand ridges/baymouth bars. The Holocene variations in sea level and climate are recorded in the dated coastal ridges, coral reef and beachrock. Conditions suitable for reef development started about 8000 a BP. The GPR profiles also show that the internal structures of the sand ridges have composite nature being formed by several superimposed secondary ridges. |
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Keywords: | sand barrier system coral reef sea level change south- ern Hainan Island |
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