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渤海湾西北岸中更新世中期以来的气候环境和沉积环境演变*
投稿时间:2020-06-12  修订日期:2020-07-08  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020273
摘要点击次数: 192
全文下载次数: 214
作者单位邮编
张晓飞 天津市地质调查研究院 300191
李继军 天津市地质调查研究院 300191
张学斌 天津市地质调查研究院 300191
黄猛 天津市地质调查研究院 300191
樊航宇 天津市地质调查研究院 300191
李明辰 天津市地质调查研究院 300191
张永义 天津市地质调查研究院 300191
吴荣泽 天津市地质调查研究院 
韩荣文 天津市地质调查研究院 300191
基金项目:本文为中国地质调查局项目(DD20160042)与天津市国土和房屋管理局项目(国土房任(2014)19号)联合资助的成果
中文摘要:渤海湾西北岸是渤海湾沿岸砂坝-潟湖沉积体系之一,其沉积物蕴含着丰富的地质环境演变信息,是认识该地区气候环境和新构造活动的关键。通过对渤海湾西北岸QEJ01孔80m以浅地层沉积环境、孢粉分析及微体古生物研究,结合测年数据,根据定量古气候重建数据,探讨了本区中更新世中晚期以来特征时期的植被演替及环境演变,并对MIS6~MIS1各阶段渤海湾西北岸的气候及环境变化进行了区域对比。QEJ01孔450.4~377.14ka,植被类型以针阔混交林为主,气候温暖干燥,沉积环境由河床逐渐演变为滨海湖泊;377.14~113.96ka,气候相对寒凉湿润,植被类型以针阔叶混交林-草原为主,沉积环境以湖泊为主,后期为洪泛平原;113.96~98.84ka,该时期气候波动频繁,以稀树荒漠草原为主,气候温凉湿润,河床发育;98.84~74.33ka,气候温暖湿润,植被景观为针阔混交林-草原,降水量增加,沉积环境以漫滩湖泊和河床相为主;74.33~48.09ka,气候异常寒冷干旱,以针叶林为主的稀疏-荒漠草原较发育;48.09~25.72ka,植被类型为针阔混交林-草原,气候温暖偏湿;25.72~22.52ka,气候寒凉干旱,植被为稀树-荒漠草原;22.52~3.87ka,植被类型由常绿落叶阔叶林演变为针阔混交林-草原,气候温暖湿润,沉积环境以三角洲平原为主;3.87~0.0 ka,气候凉爽干旱,植被类型以针阔混交林为主。渤海湾西北岸平原为构造活动的活跃地带,自MIS5阶段以来,沉降中心呈现自北西向南东迁移,以及海侵层的发育程度,均受区域构造运动和气候环境变化的影响控制。
中文关键词:渤海湾西北岸  气候环境  沉积环境  构造运动  海侵层
 
Evolution of the climatic environment and sedimentary environment since the middle-Pleistocene on the northwesterncoast of the Bohai Bay
Author NameAffiliationPostcode
Zhang Xiaofei Tianjin Institute of Geological Survey,Tianjin 300191
Li Jijun Tianjin Institute of Geological Survey,Tianjin 300191
Zhang Xuebin Tianjin Institute of Geological Survey,Tianjin 300191
Huang Meng Tianjin Institute of Geological Survey,Tianjin 300191
Fan Hangyu Tianjin Institute of Geological Survey,Tianjin 300191
Li Mingchen Tianjin Institute of Geological Survey,Tianjin 300191
Zhang Yongyi Tianjin Institute of Geological Survey,Tianjin 300191
Wu Rongze Tianjin Institute of Geological Survey 
Han Rongwen Tianjin Institute of Geological Survey,Tianjin 300191
Abstract:The northwestern shore of the Bohai Bay is part of the sand bar-lagoon sedimentary system along the Bohai Bay.Its sediments contain rich information on the evolution of the geological environment, which is the key to understanding the climate environment and new tectonic activities in the area. Based on the shallow stratigraphic sedimentary environment, sporopollen analysis and micropaleontological studies of the 80m above QEJ01 hole in the northwestern coast of the Bohai Bay, combined with dating data and quantitative paleoclimate reconstruction data, the vegetation evolution in the characteristic period since the middle-Pleistocene in this area was discussed. To replace the environmental evolution, the regional comparisons of the climate and environmental changes in the northwestern coast of the Bohai Bay at each stage of MIS6~MIS1 were carried out. QEJ01 hole 450.4~377.14ka, the vegetation type is mainly coniferous and broad-leaved mixed forest, the climate is warm and dry, and the sedimentary environment gradually evolves from a river bed to a coastal lake; 377.14~113.96ka, the climate is relatively cold and humid, and the vegetation type is coniferous and broad-leaved mixed forest -The grassland is the main, the sedimentary environment is mainly lake, and the later is the flood plain; 113.96~98.84ka, the climate fluctuates frequently during this period, mainly the sparse tree desert grassland, the climate is cool and humid, the river bed is developed; 98.84~74.33ka, The climate is warm and humid, the vegetation landscape is coniferous and broad-leaved mixed forest-grassland, precipitation increases, the sedimentary environment is mainly floodplain lake and riverbed facies; 74.33~48.09ka, the climate is unusually cold and dry, and the sparse-desert forest is mainly coniferous forest Grasslands are more developed; 48.09~25.72ka, the vegetation type is coniferous and broad-leaved mixed forest-grassland, the climate is warm and humid; 25.72~22.52ka, the climate is cold and dry, the vegetation is sparse tree-desert grassland; 22.52~3.87ka, the vegetation type is Evergreen deciduous broad-leaved forest evolves into coniferous-broad mixed forest-grassland, with a warm and humid climate, and the sedimentary environment is mainly delta plain; 3.87-0.0 ka, the climate is cool and dry, and the vegetation type is mainly coniferous-broad mixed forest. The plain on the northwestern coast of the Bohai Bay is an active zone of tectonic activity. Since the MIS5 stage, the subsidence center has migrated from northwest to southeast, and the degree of development of the transgressive layer is controlled by regional tectonic movements and changes in climate and environment.
keywords:northwest Bohai Bay  Climate environment  Sedimentary environment  Tectonic movement  Transgressive layer
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