山东莱州湾南岸晚上新世以来(6.8～0.004 Ma)古植被演替与海平面波动
Late Pliocene(6.8-0.004 Ma)vegetation evolution and sea-level fluctuations on the southern coastal plain of Laizhou Bay,Bohai Sea,China
摘要
Abstract
This paper is the result of coastal geological survey engineering. [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]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.[Conclusions]Three ancient plants have occurred and the sea level fluctuations occurred since the Late Pliocene(6.8-0.004 Ma)in the Laizhou Bay.关键词
孢粉组合/古植被/古环境演变/晚上新世/海岸带地质调查工程/莱州湾/山东Key words
pollen assemblage/paleovegetation/palaeoenvironmental evolution/Late Pliocene/coastal geological survey engineering/Laizhou Bay/Shandong Province分类
农业科技引用本文复制引用
郝秀东,李建芬,商志文,劳月英,欧阳绪红,姜兴钰,王福,田立柱,施佩歆,陈永胜,王宏..山东莱州湾南岸晚上新世以来(6.8～0.004 Ma)古植被演替与海平面波动[J].中国地质,2024,51(2):689-700,12.基金项目
国家自然科学基金项目(42001076,U20A2048,41861020)、广西自然科学基金项目(2023GXNSFBA026263)、中国科学院南京地质古生物研究所现代古生物学和地层学国家重点实验室开放基金(223109)、广西岩溶动力学重大科技创新基地开放基金项目(KDL&Guangxi202204)、广西红树林保护与利用重点实验室开放基金项目(GKLMC-201902)、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(NNNU-KLOP-X1919,NNNU-KLOP-X2101)联合资助. Supported by National Natural Science Foundation of China(No.41861020,No.42001076,No.U20A2048),Guangxi Natural Science Foundation(No.2023GXNSFBA026263),Open Funds from State Key Laboratory of Palaeobiology and Stratigraphy(Nanjing Institute of Geology and Palaeontology,CAS)(No.223109),Open Research Fund Program of Guangxi Key Science and Technology Innovation Base on Karst Dynamics(No.KDL&Guangxi202204),Open Research Fund Program of Guangxi Key Lab of Mangrove Conservation and Utilization(No.GKLMC-201902)and Open Fund of Key Laboratory of Environment Change and Resources Use in Beibu Gulf,Ministry of Education(No.NNNU-KLOP-X1919,No.NNNU-KLOP-X2101). 感谢南宁师范大学省部级重点实验室创新基地大学生创新实践训练计划项目(S202310603131,S202310603061)对本研究的支持! （42001076,U20A2048,41861020）
