海洋地质与第四纪地质2023，Vol.43Issue(6)：145-156,12.DOI:10.16562/j.cnki.0256-1492.2023033001
珠江三角洲第四纪沉积物初始沉积年龄及沉积演化
Discussion on the Quaternary initial sedimentary age and sedimentary evolution in the Pearl River Delta
摘要
Abstract
The characteristics and the age of the Quaternary sediments of the Pearl River Delta are important to understand the evolution in fluvial-delta sedimentation,fluctuations in sea level change,climate,and geography of the area as well as the South China.The optical stimulated luminescence(OSL)of the bottom sediment from the estuaries of the Pearl River Delta was studied and the age was determined to be 102.52±6.14 ka,indicating that the Quaternary deposition started in the late Pleistocene.In addition,AMS 14C dateing was conducted.Combining the OSL results and precious studies,we believe that the Pearl River Delta experienced at least two major transgressions and one regression since the late Pleistocene to Holocene.The first large-scale transgression began in the early Late Pleistocene(MIS5 stage),followed by regression in the late MIS2 stage,and transgressed again in the early Holocene(about 11 kaBP,MIS1 stage),forming at least three layers of weathered clay.During the late Pleistocene transgression,sea level fluctuated significantly.Sea level dropped notably at about 40 kaBP(MIS3 stage),forming the lower weathered clay layer;rose at about 30 kaBP,during which the delta received sediments until the late MIS2;and then the sea level went down again apparently,forming the middle and upper weathered clay layers.关键词
第四纪沉积物/AMS 14C/光释光测年(OSL)/海平面变化/珠江三角洲Key words
Quaternary sediments/AMS 14C/optical stimulated luminescence(OSL)/sea-level change/the Pearl River Delta分类
海洋学引用本文复制引用
郑思琦,林振文,李出安,李冠华,庄文明,李诗颖,罗俊超,阳峰,李雨龙..珠江三角洲第四纪沉积物初始沉积年龄及沉积演化[J].海洋地质与第四纪地质,2023,43(6):145-156,12.基金项目
广东省地质勘查与城市专项"广东省海岸带综合地质调查——横琴新区调查示范"(2020-13) （2020-13）
