热带海洋学报 ›› 2022, Vol. 41 ›› Issue (2): 103-111.doi: 10.11978/2021046

• 海洋地质学 • 上一篇    下一篇

南海宣德环礁东南海域地质灾害特征

陈梅1,2,3,4(), 夏真1,2, 刘文涛1,2(), 何健1,2, 马胜中1,2   

  1. 1. 南方海洋科学与工程广东省实验室(广州), 广东 广州 511458
    2. 自然资源部海底矿产资源重点实验室, 中国地质调查局广州海洋地质调查局, 广东 广州 510760
    3. 中国地质调查局南海地质科学院, 海南 三亚 572025
    4. 广州海洋地质调查局三亚南海地质研究所, 海南 三亚 572025
  • 收稿日期:2021-04-11 修回日期:2021-06-18 出版日期:2022-03-10 发布日期:2021-06-30
  • 通讯作者: 刘文涛
  • 作者简介:陈梅(1988—), 女, 四川省资阳市人, 高级工程师, 从事海洋地质研究。email: chenmei@scsio.ac.cn
  • 基金资助:
    南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(GML2019ZD0208);中国科学院边缘海与大洋地质重点实验室开放基金(OMG2019-09);中国地质调查局国家海洋专项(DD20160146);中国地质调查局国家海洋专项(DD20221725);中国地质调查局国家海洋专项(DD20201118)

Geohazards characteristics in the southeast of Xuande Atoll, Xisha, South China Sea

CHEN Mei1,2,3,4(), XIA Zhen1,2, LIU Wentao1,2(), HE Jian1,2, MA Shengzhong1,2   

  1. 1. Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
    2. Key Laboratory of Marine Mineral Resources, Ministry of Natural Resources, Guangzhou Marine Geological Survey, Guangzhou 510760, China
    3. Academy of South China Sea Geological Science, China Geological Survey, Sanya 572025, China
    4. Sanya Institute of South China Sea Geology, Guangzhou Marine Geological Survey, Sanya 572025, China
  • Received:2021-04-11 Revised:2021-06-18 Online:2022-03-10 Published:2021-06-30
  • Contact: LIU Wentao
  • Supported by:
    Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)(GML2019ZD0208);Open Foundation of Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences(OMG2019-09);Geological Survey Project(DD20160146);Geological Survey Project(DD20221725);Geological Survey Project(DD20201118)

摘要:

宣德环礁作为我国南海诸岛礁开发利用程度最高的岛礁之一, 其周围海域地质灾害对岛礁基础工程建设及人类活动具有重大危害。为适应南海岛礁可持续发展的需要, 文章采用广州海洋地质调查局2018年采集的单道地震数据, 对宣德环礁东部斜坡带海域灾害地质因素进行综合解释和分析。结果表明, 研究区主要发育有海底滑坡、海底陡坎和断层3类地质灾害。海底滑坡是研究区主要灾害地质因素, 规模大小不一, 海底陡坎和断层为次要地质灾害。海底陡坎根据成因可分为礁体陡坎和滑坡陡坎, 礁体陡坎为礁盘形成过程中受海平面上升控制形成, 滑坡陡坎为海底滑坡导致。通过分析认为陡峭的地形和峡谷水道的侵蚀搬运作用是研究区地质灾害发育的主控因素。这些地质灾害对海洋工程建设及管线铺设均有不利的影响, 应尽量避开。

关键词: 宣德环礁, 地质灾害, 海底滑坡, 海底陡坎, 断层

Abstract:

The Xuande Atoll is one of the most exploited and utilized area in the South China Sea. Offshore geological hazards around the Xuande Atoll are likely to threaten the construction of reef infrastructure projects and human activities. To meet the needs of sustainable development of islands and reefs in the South China Sea, this study aims to explore the types and spatial distribution of geological hazards in the east sea area of the Xuande Atoll based on single-channel seismic profiles collected by the Guangzhou Marine Geological Survey in 2018. The results show that there are three kinds of geological hazards in the study area, including submarine landslides, seabed scarps and faults. Submarine landslides are the main geological hazard factor in the study area with different scales, and seabed scarps and faults are the secondary geological hazards. Seabed scarps can be divided into reef scarps and landslide scarps according to their genetic mechanisms. The reef scarps were formed under the control of sea-level rise during the formation of the reef, and the landslide scarps were caused by submarine landslide. The tectonic environment in the study area is relatively stable, so we infer that the steep topography and canyon erosion are the main controlling factors for the development of geological hazards. These geological hazards have adverse effects on marine engineering construction and pipeline laying. The results of this study provide basic geological services for infrastructure construction, active disaster prevention and sustainable economic development around the Xuande Atoll and its surrounding areas.

Key words: Xuande Atoll, geological hazards, submarine landslides, seabed scarps, faults

中图分类号: 

  • P736.1