莱州湾南岸晚上新世以来的古植被演替与海平面波动
作者:
作者单位:

1.南宁师范大学地理与海洋研究院;2.南宁师范大学;3.中国地质调查局天津地质调查中心

作者简介:

通讯作者:

中图分类号:

基金项目:


Late Pliocene vegetation evolution and sea-level fluctuations on the southern coastal plain of Laizhou Bay, Bohai Sea, China
Author:
Affiliation:

1.Key Laboratory of Beibu Gulf Environment Change and Resources Utilization Nanning Normal University,Ministry of Education;2.Tianjin Centre,China Geological Survey

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    【研究目的和研究方法】海岸带沉积物钻孔的微体古生物化石保存着丰富的地质环境信息,常常作为重建过去植被演替及海平面波动的重要指标。为揭示莱州湾南岸晚上新世以来的古植被演替与海平面波动,本研究拟通过对HLL01钻孔的孢粉、淡水藻类、海相沟鞭藻、有孔虫内衬等微体古生物化石的分析,恢复和重建莱州湾南岸及其附近地区晚上新世以来的古植被演替与海平面波动。 【研究结果和结论】研究发现:(1)在晚上新世-早更新世阶段(约6.8-1.6 Ma),大量的陆生草本花粉(75.13%)指示研究区的植物群落主要以藜科、蒿属及禾本科为主的草原植被,气候温暖偏干。(2)在早更新世-中更新世阶段(约1.6-0.6 Ma),研究区的植物群落开始由草原向森林草原类型过渡;急剧增加的淡水藻类,则指示研究区可能有大的河流注入,或形成较大规模的湖泊;降水量增加,气候变得湿润。(3)在中更新世-晚全新世阶段(约0.6-0.004 Ma),研究区的植物群落已经变成森林草原植被。淡水藻类含量略有降低,指示研究区的河流注入量开始减少,湖泊面积也开始萎缩。同时,海相沟鞭藻和有孔虫内衬等海相化石记录,指示研究区在该阶段出现了较为明显的大规模海侵事件。 【创新点】1)系统开展了莱州湾南岸的孢粉、淡水藻类、海相沟鞭藻、有孔虫内衬等微体古生物化石的研究工作;2)依据微体古生物化石记录,揭示了晚上新世以来三次主要的古植被演替与海平面波动事件。

    Abstract:

    Objective Microfossils, especially pollen, spores, and dinoflagellate cysts, as direct indicators or proxies, provide significant information on geological environment. Therefore, palynological analysis has an important role in restoration and reconstruction of vegetation history and sea-level fluctuations, which provides information from the sediment cores, especially in alluvial coastal plain regions. Methods In this study, we carry out analyses using detailed palynological records of pollen, spores, freshwater algae, marine dinoflagellate cysts, and foraminiferal organic linings from Borehole HLL01 on the southern coastal plain of Laizhou Bay, Bohai Sea, northern China. Results and Conclusions The results provide valuable information on vegetation history and sea-level fluctuations since the Late Pliocene. Large amounts of terrestrial herb pollen (75.13%; mainly composed of Chenopodiaceae, Artemisia and Poaceae) were identified at Borehole HLL01, suggesting that coastal steppes flourished in the study area and its adjacent areas, and a cold and dry climate than the present during the Late Pliocene to Early Pleistocene, ca. 6.8-1.6 Ma. After that, the steppe areas began to shrink, and the transition of coastal steppes to forest grasslands occurred in the Early-Middle Pleistocene, ca. 1.6-0.6 Ma, indicating a warm and humid climate. A sharp increase in freshwater algae indicates that large rivers’ discharge had been injected into the study area, or large lakes were formed. Afterward, relatively cool and dry climatic conditions appeared, with little precipitation, and a relatively significant transgression event revealed by dinoflagellate cysts and foraminifera organic linings, and forest grassland vegetation was distributed in the study area and its adjacent areas, during the Middle Pleistocene to Holocene, ca. 0.6-0.004 Ma. Highlights ? Pollen, spores, freshwater algae, marine dinoflagellate cysts, and foraminiferal organic linings from the southern coastal plain of Laizhou Bay were investigated. ? Three major phases shown by palynological results were corresponding to the vegetation evolution and sea-level fluctuations

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2021-08-04
  • 最后修改日期:2022-01-26
  • 录用日期:2022-02-27
  • 在线发布日期: 2023-02-15
  • 出版日期:
温馨提示:建议您使用Chrome、火狐、IE最新版本 ,当您的浏览器版本过低,可能会影响部分功能正常使用。
关闭