海洋地质前沿2026，Vol.42Issue(2)：14-27,14.DOI:10.16028/j.1009-2722.2025.052
南海中央海盆后扩张期岩浆活动
Post-spreading magmatic activity in the Central Basin of the South China Sea
摘要
Abstract
After the cessation of seafloor spreading in the Central Basin of the South China Sea,frequent mag-matic activities have occurred.However,direct sampling and investigation of these active magmatic processes have been extremely challenging due to deep-water environment.We comprehensively analyzed the characterist-ics and episodes of post-spreading magmatic activities in the Central Basin of the South China Sea by interpreting 2D seismic profiles integrated with trawling sample data and relevant drilling research findings.A model of the re-lationship between magmatic activity and sedimentation was established,and seismic reflection features and seis-mic facies characteristics were interpreted.Results indicate that the magmatic activities in the Central Basin exhib-it pulsating phases,forming numerous seamounts and magmatic diapirs characterized by multi-phase intermittent eruptions and shallow intrusions.Four major episodes of post-spreading magmatic activities were identified in the Central Basin.Three episodes at approximately 11.6 Ma,7.5 Ma,and 5.3 Ma show remarkable consistency with radiometric dating of rock samples.Notably,the magmatic activity around 1.6 Ma was found to persist into recent times with extensive distribution.For the first time,evidence of magmatic activities during 2.6-1.6 Ma was dis-covered,challenging the previous notion of a magmatic quiescence period in this interval.Additionally,the study reveals that while some magmatic diapirs and submarine volcanoes formed through single eruptive events,others developed into larger-scale features through multiple volcanic activities.关键词
岩浆活动/后扩张期/活动期次/海底山和岩浆底辟/中央海盆/南海Key words
magma activity/post-spreading stage/active period/seamount and magmatic diapir/the Central Basin/South China Sea分类
海洋科学引用本文复制引用
马浩明,邱燕,黄文凯..南海中央海盆后扩张期岩浆活动[J].海洋地质前沿,2026,42(2):14-27,14.基金项目
中国地质调查局项目(DD20240090,DD20221712) （DD20240090,DD20221712）
广东省科技计划项目(2023A1111120028) （2023A1111120028）
