北京平原区中更新世晚期以来古环境演变——以平谷Zk09钻孔为例  

Evolution of Paleo-environment since the Late Middle Pleistocene——Exemplified by Zk09 borehole in Pinggu of the Beijing Plain

作　　者：何付兵[1] 马学利 吴超 刘振华[1] 崔玉斌 牛文治 刘晓勇 HE Fubing;MA Xueli;WU Chao;LIU Zhenhua;CUI Yubin;NIU Wenzhi;LIU Xiaoyong(Beijing Institute of Geological Survey,Beijing,100195;Beijing Bureau of Geology and Exploration and Development,Beijing,100195)

机构地区：[1]北京市地质调查研究院,北京100195 [2]北京市地质矿产勘查院,北京100195

出　　处：《城市地质》2020年第3期288-295,共8页Urban Geology

基　　金：北京市地质调查项目(PXM2018-158203-000014);北京市市级职工创新工作室(城市地质、活动构造与监测)资助。

摘　　要：对位于北京平谷马坊村新生代Zk09孔沉积物磁化率、色度现场测试和碳十四、光释光年龄测试表明,北京平原区东北部65m深地层沉积稳定,沉积时代约为250ka以来。期间沉积地层磁化率、色度同岩性关系密切,主要受控于氧化-还原环境条件和水动力条件,即温度和降水古气候环境,可作为重要的古气候演化替代性指标。其沉积物地层年代-磁化率、色度曲线发育7次演化旋回,较好记录了MIS1—MIS7倒数第二次冰期间冰期以来的古气候环境演化过程。Combining the results of carbon-14,luminescence and field tests,including magnetic susceptibility and chromaticity,from the Zk09 borehole in the Mafang area of Beijing,65-m depth stratigraphic framework in the northeastern part of the Beijing sub-plain was firstly established.Our research shows:(1)its sedimentary dating is about since 250ka,and its depositional rate is basically stable.(2)The magnetic susceptibility and chromaticity of the sedimentary stratum are closely related to lithology,and are mainly controlled by the paleo-climate environment,including the oxidation-reduction environmental conditions(i.e.temperature)and hydrodynamic conditions(i.e.humidity).Therefore,they could be used as important indicators of paleoclimate evolution.(3)The curves of the sedimentary stratigraphic vs.magnetic susceptibility and chromaticity have developed seven evolutionary cycles,which better record the evolution of the paleo-climatic environment from the MIS1 to MIS7 of the deep sea oxygen isotope stage.

关 键 词：Zk09钻孔 年代地层 现场测试 磁化率与色度 古环境 北京平谷 

分 类 号：P532[天文地球—古生物学与地层学]