海洋地质与第四纪地质2025，Vol.45Issue(2)：110-120,11.DOI:10.16562/j.cnki.0256-1492.2023120502
琼东南盆地中新世植被演替与古气候变化
Vegetation evolution and climate change during the Miocene in the Qiongdongnan Basin
摘要
Abstract
The Miocene Meishan Formation in the Qiongdongnan Basin in the northern continental shelf of the South China Sea lacks direct fossil evidence for understanding the ancient vegetation and climate conditions in the basin due to the scarcity of spores and pollen fossils.The Miocene biostratigraphy,vegetation,and climate changes were documented from 114 fossiliferous samples from Well ST-A.Results show that the calcareous nannofossil boundaries of the Sanya Formation(Early Miocene)/Meishan Formation(Middle Miocene)/Huangliu Formation(Late Miocene)are at 2780 m and 2300 m in depth,respectively.Miocene vegetation in the study area was tropical and subtropical evergreen broad-leaved forest,and mixed forest of evergreen broad-leaved and deciduous broad-leaved.The presence of coniferous forest restricted to the uplands shown in the Sanya Formation reflects warmer and wetter climate in Early Miocene than that of the late Oligocene in the Lingshui Formation.The expansion of the evergreen broad-leaved forest and deciduous broad-leaved forest,accompanied by the contraction of the coniferous forest during early and middle stage of the middle Miocene(the bottom and middle section of Meishan Formation),suggested increases in temperature and humidity,which is indicative of the Middle Miocene Climate Optimum(MMCO).The climate conditions in late Miocene(the top of Meishan Formation and Huangliu Formation)turned to be cold,characterizing of the flourish of coniferous forest again.Meishan Formation witnessed the climate variability of warm and cold during the middle Miocene.关键词
孢粉/钙质超微化石/植被/中中新世气候最适宜期/琼东南盆地Key words
spore and pollen/calcareous nannofossil/vegetation/Middle Miocene Climate Optimum/Qiongdongnan Basin分类
海洋科学引用本文复制引用
杨锐,覃军干,王任,张伟,闫琢玉,崔书姮,黄智进,阮枝梅..琼东南盆地中新世植被演替与古气候变化[J].海洋地质与第四纪地质,2025,45(2):110-120,11.基金项目
广东省软科学研究计划项目(218B030323028) （218B030323028）
中海石油(中国)有限公司科研项目"琼东南盆地梅山组有效浊积储集体主控因素及储层预测技术"(YXKY-ZX032021) （中国）
