南海及其周缘地区全新世海平面遗迹的构造含义

孙桂华; 邱燕; 朱本铎

南海及其周缘地区全新世海平面遗迹的构造含义

国土资源部广州海洋地质调查局, 广东广州 510760

基金项目: 国土资源大调查项目资助(1212010611302)

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出版历程
- 收稿日期: 2008-12-22
- 修回日期: 2009-06-06

The tectonic implications of Holocene sea-level relics in the South China Sea and adjacent areas

Guangzhou Marine Geological Survey Bureau, Ministry of Land and Natural Resources, Guangzhou 510760, China

摘要

摘要: 通过对海南岛海岸带野外考察,在文昌市铜鼓岭石头公园观察到高程为30m的海平面遗迹,在东方市黄流镇观察到高程为25~35m的海平面遗迹,在三亚市鹿回头观察到高程为2.5m的海平面遗迹。综合研究前人在该区关于海平面变化的研究成果,得出如下几点初步认识:(1)南海及其周缘地区中全新世以来海平面呈下降趋势,海平面最高位置出现在7000a左右、高于现代海平面3m左右的位置;(2)南海中全新世以来海平面遗迹所揭示的古海平面高程的差异性是古海平面本身持续下降和该区地壳差异性垂直运动共同作用的结果;(3)南海及其周缘地区中全新世期间中央海盆及其西缘的珠江口、红河、湄公河和昭披耶河4个河流三角洲地区为构造沉降区,而南海周缘的台湾岛、雷州半岛、印支半岛、南马来半岛、爪哇岛和苏拉威西岛6个地区为构造抬升区,抬升幅度最大的地方在台湾岛。
- 海平面遗迹 /
- 中全新世 /
- 地壳差异性垂直运动 /
- 南海及其周缘地区
Abstract: Three sea level relics were introduced based on the investigation of the Hainan Island coastal zone: the sea level relic of the Shitou Park, Tongguling of Wenchang City with 30 m height above present-day sea level, the sea level relic of Huangliu Town of Dongfang City with 25～35 m height above present-day sea level, and the sea level relic of Luhuitou of Sanya City with 2.5 m height above present-day sea level. The following several conclusions are got based on the synthetical research of other scientist's study results about the change of sea level. First, the sea level of the South China Sea and adjacent areas has had falling tendency since mid-Holocene, and the highest height is 3 m above present-day sea level with the emergence geolo gical age of 7 ka. Second, the height's otherness of paleo sea-level of the South China Sea and adjacent areas since mid-Holocene that has been displayed by sea level relics is the conjunct result of paleo sea-level continuance descend and otherness vertical movement of crust. Finally, the central ocean basin, and the deltas of Zhujiang River, Red River, Mekong River and Zhaopiye River were structural subsidence areas, but Taiwan Island, the Leizhou Peninsula, the Indochina Peninsula, the South Malaya Peninsula, Java Island and Sulawesi Island were structural uplifted areas in the South China Sea and adjacent areas during mid-Holocene, and the biggest amplitude of structural uplift was located in Taiwan Island.
- sea level relics /
- mid-Holocene /
- otherness vertical movement of crust /
- South China Sea and adjacent areas

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