华南地震2026，Vol.46Issue(1)：18-25,8.DOI:10.13512/j.hndz.2026.01.03
粤东沿海地区海蚀遗迹分布及宇宙成因核素测年分析
Spatial Distribution of Marine Erosional Landforms and Primary Exploration of Cosmogenic Dating Along the Coastline of Eastern Guangdong,China
摘要
Abstract
The tectonic activity since the Late Pleistocene plays a critical role in evaluating crustal stability in the coastal areas of South China.Previous studies have systematically examined the relationship between sedimentation and faulting in subsidence zones,whereas uplift areas have received limited attention due to dating constrains.Cos-mogenic nuclide dating effectively resolves the chronological challenges in uplift regions.This study investigates ma-rine erosional landforms along the eastern Guangdong coastal zone,focusing on granite-based marine terraces in Zhelang,Shanwei.By determining the exposure ages of four marine terraces using cosmogenic nuclides,we quan-tify the differential movement rates in uplift areas.The results reveal that the four marine terraces correspond to modern sea level,the Holocene highstand,and paleo-sea levels during MIS3 and MIS4.The elevation differences between paleo-sea levels and contemporary terraces indicate tectonic uplift in Shanwei since MIS4.The maximum uplift exceeding 100 m since MIS3 yields an average rate of～2 mm/a,consistent with current uplift rates observed in the southwestern Pearl River Delta.Similarly,a local average uplift of 106 m since MIS4 corresponds to a rate of～1.5 mm/a calculated over 70 ka,aligning with uplift rates derived from the Shipai Formation in the Pearl River Delta.These results reveal that the basement faults(blocks)in the Shanwei area have exhibited relatively pro-nounced activity characteristics since the Last Glacial Period.These findings provide an important geological refer-ence for assessing the safety of the Shanwei urban area and the neighboring city clusters of the Guangdong-Hong Kong-Macao Greater Bay Area,and should be given high priority in regional stability evaluations.关键词
海蚀地貌/宇宙成因核素测年/构造隆升/粤东沿海Key words
Marine erosional landform/Cosmogenic nuclide dating/Tectonic uplift/Coastline of eastern Guang-dong分类
天文与地球科学引用本文复制引用
邓焰平,黎识敏,黄屏,梁浩,陈震..粤东沿海地区海蚀遗迹分布及宇宙成因核素测年分析[J].华南地震,2026,46(1):18-25,8.基金项目
国家自然科学基金(42272250) （42272250）
广东省基础与应用基础研究基金项目(2023A1515011812) （2023A1515011812）
中山大学中央高校基本科研业务费专项资金(24pnpy298) （24pnpy298）
广东省汕尾市城市地质(试点)调查项目(441501-2022-02294)联合资助. （试点）
