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北部湾涠洲岛珊瑚礁海岸及第四纪沉积特征
叶维强1, 黎广钊1, 庞衍军1, 李乃芳2
1.广西海洋研究所;2.宁波市经济研究中心
摘要:
本文探讨了涠洲岛珊瑚礁海岸及第四纪沉积特征。该岛是第四纪玄武岩喷发时在水下堆积而成的火山碎屑岩岛,其珊瑚礁大约形成于3100a前。岛上构造主要受NE、Nw—SE向断裂的控制,地形南高北低,新构造运动以断裂、火山活动为特征。
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基金项目:
CHARACTERISTICS OF THE COASTAL CORAL REEF AND QUATERNARY SEDIMENT FROM THE WEIZHOU ISLAND, BEIBU GULF
Abstract:
The island was a formation of basalt of volcanic eruption during quaternary period. The coast was eroded in the south and sedimentated in the north. The coral reef of Weizhou island was formed about 3100 years. B.P. Most of the reef-building coral are massively colony, which are characteristic of mixed sedimentation of carbonates and terrigenous elastics. The NE and NW-SE trend feactures controlled Weizhou island, which is high in the south and low in the north. New tectonic movement are characteristic of fracture and volca-nicity. Marine sediments in the north of island are volcanic accumulation.
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