烟台市芝罘剖面末次间冰期沉积记录的降水量变化及其淋溶—淀积特征  

Precipitation variation and leaching-deposition characteristics during the Last Interglacial period recorded in deposition from Zhifu profile,Yantai City

作　　者：孙丽 李志文 苏志珠[2] 张慧娟[2] 杜丁丁 杜兰 黎武标 SUN Li;LI Zhiwen;SU Zhizhu;ZHANG Huijuan;DU Dingding;DU Lan;LI Wubiao(School of Environmental and Chemical Engineering,Foshan University,Foshan 528000;School of History and Culture,Shanxi University,Taiyuan 030006;School of Earth Sciences,East China University of Technology,Nanchang 330013,China)

机构地区：[1]佛山科学技术学院环境与化学工程学院,佛山528000 [2]山西大学历史与文化学院,太原030006 [3]东华理工大学地球科学学院,南昌330000

出　　处：《干旱区资源与环境》2022年第3期116-121,共6页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金(41571007、41201006)资助。

摘　　要：海岸带沉积对于揭示特定时期的气候变化和海平面波动及其相互关系具有重要意义。位于北黄海的烟台市芝罘岛,是海洋—陆地—大气环流等因素共同作用的敏感区域。选择该区末次间冰期的黄土-古土壤沉积序列进行工作,采用OSL测年方法构建年代学框架,通过CaCO_(3)含量和pH值的变化规律,并对比平均粒径(Mz)和粘粒含量,得出结论如下:1)CaCO_(3)含量和pH值的高值指示降水较少而低值指示降水丰富的气候环境,是反映降水变化的有效指标。2)CaCO_(3)淀积成因与黄土高原的淀积CaCO_(3)和后期淋溶残余CaCO_(3)相同。3)二者在黄土层(ZF5、ZF7,对应于MIS5b和MIS5d)主要呈现为峰值,指示降水较少的相对寒冷干燥环境;古土壤层(ZF4、ZF6、ZF8,对应于MIS5a、MIS5c和MIS5e)主要呈现为谷值,为降水丰富的湿润环境。该记录与中国东部季风区的石笋δ^(18)O、黄土高原沉积、黄渤海的海平面波动规律具有良好的对应关系。Coastal sediments are of great significance for revealing climate changes,sea level fluctuations and their relationships in specific periods.Zhifu Island,Yantai City,located in the northern Yellow Sea,is a sensitive area affected by ocean-land-atmosphere circulation.The aim of the study is to reveal the paleoenvironmental changes since the Last Interglacial period by the contents of CaCO_(3),pH values,medium grain size(Mz),clay contents,and OSL chronology derived from loess-paleosoil sedimentary sequence of Zhifu profile.The results displayed that:1)The high values of CaCO_(3)and pH indicate the climate with less precipitation,while the low values indicate the climate with abundant precipitation,which are effective indexes to reflect the change of precipitation.2)We discovered that the genesis of CaCO_(3) deposition is the same as that of deposited CaCO_(3) and late leaching residual CaCO_(3) in the Loess Plateau.3)In the MIS5 stage,the average content of CaCO_(3) and the pH value in the loess layers(ZF5,ZF7,equivalent to MIS5 b and MIS5 d)appear the“peaks”and indicate relatively cold and dry environment with less precipitation.Their values in the paleosol layers(ZF4,ZF6,ZF8,equivalent to MIS5 a,MIS5 c and MIS5 e,respectively)appear the“valleys”and indicate humid environment with abundant precipitation.The paleo-environmental variations reflected in the Zhifu profile show a good corresponding relationship with the summer monsoon intensity recorded by theδ^(18)O curve of the stalagmite,loess-paleosoil sequence in the Loess Plateau,and the sea level fluctuations of the Yellow Sea and Bohai Sea,China.

关 键 词：芝罘剖面 末次间冰期 黄土-古土壤序列 降水量变化 淋溶—淀积特征 

分 类 号：P426.615[天文地球—大气科学及气象学]