晚上新世以来莱州湾南岸HLL02钻孔的孢粉记录及其古环境演变  

Late Pliocene palynological record and paleoenvironmental change from the borehole HLL02 in the south coast of Laizhou Bay,Bohai Sea,China

作　　者：姜兴钰[1,2] 王琳 郝秀东 王福[1,2] 田立柱[1,2] 施佩歆[1,2] 陈永胜[1,2] 王宏[1,2] 李建芬[1,2] 商志文[1,2] JIANG Xing-yu;HAO Xiu-dong;WANG Fu;TIAN Li-zhu;SHI Pei-xin;CHEN Yong-sheng;WANG Hong;LI Jian-fen;SHANG Zhi-wen(Tianjin Centre,China Geological Survey,Tianjin 300170,China;CGS Key Laboratory of Muddy Coast Geo-environment,Tianjin 300170,China;Key Laboratory of Beibu Gulf Environment Change and Resources Utilization(Nanning Normal University),Ministry of Education,Nanning 530001,China;Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation,Nanning Normal University,Nanning 530001,China)

机构地区：[1]中国地质调查局天津地质调查中心,天津300170 [2]中国地质调查局海岸带地质环境重点实验室,天津300170 [3]天津市测绘地理信息研究中心,天津300381 [4]南宁师范大学北部湾环境演变与资源利用教育部重点实验室,南宁530001 [5]南宁师范大学广西地表过程与智能模拟重点实验室,南宁530001

出　　处：《地质调查与研究》2020年第4期341-347,共7页Geological Survey and Research

基　　金：中国地质调查局项目“津冀沿海资源环境承载能力调查(DD20189506)”;国家自然科学基金项目(41861020);广西自然科学基金项目(2018GXNSFAA281264);广西科技计划项目(桂科AD19245018,2019AC20295);北部湾环境演变与资源利用教育部重点实验室开放基金项目(GTEU-KLXTJJ-201712,NNNU-KLOP-X1919);南宁师范大学科研启动项目(0819-2017L23,0819-2019L39)。

摘　　要：通过对莱州湾南岸HLL02钻孔的孢粉分析,得出了其晚上新世以来的古植被演替及古环境变迁。孢粉结果显示:(1)在晚上新世-早更新世阶段,莱州湾南岸及其附近地区的植物群落主要是以蒿属、藜科及禾本科为主的草原,气候温暖偏干。极低的淡水藻类含量也指示研究区并没有大的河流注入,或大的湖泊形成,降水量较少;(2)在早更新世-中更新世阶段,莱州湾南岸及其附近地区的植物群落开始由草原向森林草原过渡,指示了温暖湿润的气候状况。淡水藻类的增加,指示莱州湾南岸及其附近地区可能有大的河流注入,或大的湖泊形成,降水量增加;(3)在中更新世-晚全新世阶段,莱州湾南岸及其附近地区的植被类型已经成为森林草原植被。淡水藻类含量数量达到整个钻孔的最高值,指示研究区的河流注入量持续增加,湖泊面积也开始扩张,气候变得寒冷偏干。此外,综合HLL02钻孔的海相沟鞭藻记录,发现研究区在中更新世-晚全新世阶段出现了较为明显的海侵事件。A sediment borehole(named HLL02)was examined for palynological content,which from the south coast of Laizhou Bay,Bohai Sea,China.The results provide valuable information on climate change,vegetation history and environmental change since the Late Pliocene.During the Late Pliocene to Early Pleistocene,the vegetation communities on the south coast of Laizhou Bay and its adjacent areas are mainly grasslands dominated by Artemisia,Chenopodiaceae and Poaceae.The climate was warm and dry.The transition of grasslands to forest grasslands was occurred in the Early-Middle Pleistocene,indicating a warm and humid climate.An increase in freshwater algae indicates that large rivers may be injected to the studies areas,or large lakes are formed.During the Middle Pleistocene to Holocene,forest grassland vegetation was distributed in the Laizhou Bay and its adjacent areas,and the amount of river injection began to increase,the lake area began to expand,and the climate became cold and dry.Meanwhile,integrated dinoflagellate cyst records,revealed that a relatively significant transgression event during the mid-Pleistocene to late-Holocene stage.

关 键 词：孢粉组合 沟鞭藻 莱州湾 古植被 晚上新世 

分 类 号：Q914.[天文地球—古生物学与地层学]