| 渤海湾西岸全新世以来沉积物地球化学与黏土矿物特征及其对环境和气候的响应 |
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| 引用本文： | 杨士雄,叶思源,何磊,袁红明,赵广明,丁喜桂,裴绍峰,路晶芳.渤海湾西岸全新世以来沉积物地球化学与黏土矿物特征及其对环境和气候的响应[J].海洋地质与第四纪地质,2021,41(2):75-87. |
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| 作者姓名： | 杨士雄 叶思源 何磊 袁红明 赵广明 丁喜桂 裴绍峰 路晶芳 |
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| 作者单位： | 中国地质调查局滨海湿地生物地质重点实验室,青岛海洋地质研究所,青岛 266071;青岛海洋科学与技术试点国家实验室海洋地质过程与环境功能实验室,青岛 266061;中国地质调查局滨海湿地生物地质重点实验室,青岛海洋地质研究所,青岛 266071 |
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| 基金项目： | 国家自然科学基金“基于现代孢粉传播机制探讨渤海中部泥质区全新世物质来源及陆缘植被变化”(41876057),“辽河三角洲海岸带全新世沉积演化时空差异的研究”(41706057);中国地质调查局项目(DD20160144,DD20189503,DD20190208);山东省泰山学者项目(ts201511077)。 |
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| 摘 要： | 通过对渤海湾西岸BXZK11孔沉积物黏土矿物、地球化学元素组分、粒度分析以及AMS14C年代测定并与研究区周边6个具有较好年龄控制的钻孔剖面对比,结合黏土矿物蒙脱石/(伊利石+绿泥石)比值以及元素Al/Si和Al/Na比值对气候变化的响应,探讨了渤海湾西岸地区全新世以来沉积环境以及气候变化过程。结果表明,末次盛冰期到8830 cal.aBP,海平面快速上升,海水临近研究区,沉积物以黄河古河道沉积为主,气候温凉略湿;8830~6255 cal.aBP,海侵范围达到最大,研究区主要为潮坪-浅海环境,气候温暖湿润;6255~3650 cal.aBP,海平面逐渐降低,沉积环境为前三角洲沉积,沉积物为黄河三角洲的一期超级叶瓣,气候转为温凉稍湿;3650~2780 cal.aBP,海平面趋于稳定,三角洲不断进积,为三角洲前缘环境,气候向凉干方向变化;2780 cal.aBP至今,古黄河三角洲不断进积,该区变成三角洲平原环境,气候凉干与现今相似。
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| 关 键 词： | 黏土矿物 地球化学 沉积环境 全新世 渤海湾西岸 |
Geochemical and clay mineral characteristics of the Holocene sediments on the west coast of Bohai Bay and their implications for environmental and climatic changes |
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| YANG Shixiong,YE Siyuan,HE Lei,YUAN Hongming,ZHAO Guangming,DING Xigui,PEI Shaofeng,LU Jingfang.Geochemical and clay mineral characteristics of the Holocene sediments on the west coast of Bohai Bay and their implications for environmental and climatic changes[J].Marine Geology & Quaternary Geology,2021,41(2):75-87. |
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| Authors: | YANG Shixiong YE Siyuan HE Lei YUAN Hongming ZHAO Guangming DING Xigui PEI Shaofeng LU Jingfang |
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| Institution: | (Key Laboratory of Coastal Wetland Biogeosciences of China Geological Survey,Qingdao Institute of Marine Geology,Qingdao 266071,China;Laboratory for Marine Geology,Pilot National Laboratory for Marine Science and Technology,Qingdao 266061,China) |
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| Abstract: | Based on the data of clay mineralogy,element geochemistry,grain size and AMS14C dating from the core of BXZK11 collected from the west coast of Bohai Bay and the correlation made with six well dated core profiles surrounding the study area,in addition to the smectite/(illite+chlorite)ratio,Al/Si ratio and Al/Na ratio analysis results,the sedimentary environmental and climatic changes since the beginning of Holocene are discussed for the region in this paper.The results suggest that owing to the rapid sea level rising during the period from the Last Glacial Maximun to 8830 cal.aBP,the sea water was quite close to the study area,the sedimentary environment had been dominated by the paleo-channel of the Yellow River,and a cool and slightly humid climate.During the period of 8830 to 6255 cal.aBP when the transgression reached its peak,the study area had been dominated by tidal flat and shallow sea and a warm and humid climate.From 6255 cal.aBP to 3650 cal.aBP,as the sea level was gradually dropping,this area had been occupied by a prodelta deposit,as one of the super lobes of the Yellow River Delta,under a cool and slightly humid climate.In the period from 3650 to 2780 cal.aBP,the sea level had remained stable to keep the delta continuously progradating as a delta front,while the climate changed to cool and dry.Since 2780 cal.aBP,the ancient Yellow River Delta has been continuously expanding,and the study area become a wide deltaic plain and the climate is cool and dry,similar to that of the present. |
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| Keywords: | clay minerals geochemistry sedimentary environment Holocene the west coast of Bohai Bay |
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