倒数第二次间冰期以来黄河下游冲洪积物释光年代及其古气候意义  

LUMINESCENCE DATING OF ALLUVIAL SEDIMENTS IN THE LOWER REACHES OF THE YELLOW RIVER OVER THE PENULTIMATE INTERGLACIAL PERIOD AND CLIMATE IMPLICATIONS

作　　者：赵秋月 方慜 彭淑贞[1] 刘宁 臧凯旋 宋波 范念念[4] 周锐[5] 张伟[1] 张文琪 丁敏[1] 赖忠平 ZHAO Qiuyue;FANG Min;PENG Shuzhen;LIU Ning;ZANG Kaixuan;SONG Bo;FAN Niannian;ZHOU Rui;ZHANG Wei;ZHANG Wenqi;DING Min;LAI Zhongping(Tourism College,Taishan University,Tai'an 271000,Shandong;College of Life Science,Yan'an University,Yan'an 716000,Shaanxi;Beijing Jing Yuan School,Beijing 100040;State Key Laboratory of Hydraulics and Mountain River Engineering,College of Water Resource&Hydropower,Sichuan University,Chengdu 610065,Sichuan;Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036;Institute of Marine Sciences,Shantou University,Shantou 515063,Guangzhou)

机构地区：[1]泰山学院旅游学院,山东泰安271000 [2]延安大学生命科学学院,陕西延安716000 [3]北京市京源学校,北京100040 [4]四川大学水利水电学院,水力学与山区河流开发保护国家重点实验室,四川成都610065 [5]中国地震局地震预测研究所,北京100036 [6]汕头大学海洋研究院,广州汕头515063

出　　处：《第四纪研究》2022年第5期1277-1286,共10页Quaternary Sciences

基　　金：山东省自然科学基金面上项目(批准号:ZR2021MD008);国家自然科学基金项目(批准号:41888101和41602353);中国科学院地球环境研究所黄土与第四纪地质国家重点实验室开放基金项目(批准号:SKLLQG2134);中国地震局地震预测研究所基本科研业务费专项项目(批准号:2019IEF0505)共同资助。

摘　　要：黄河下游沿岸黄土中沉积的冲洪积物,记录了当时水文和气候变化过程。目前对于黄河流域冲洪积事件的判别和水文重建研究多集中于中游和上游,下游地区冲洪积物研究较少。在鲁中山地北麓和黄河下游南岸之间的黄土沉积中,普遍保存着典型的冲洪积物,选择4个代表性剖面的10个释光样品(小章庄剖面约635 cm厚,采集4个释光样品;直东峪剖面约450 cm厚,采集2个释光样品;九龙峪剖面约290 cm厚,采集2个释光样品;陶峪村剖面约350 cm厚,采集2个释光样品),采用石英单片再生剂量法(SAR)或钾长石红外后红外释光测年法(pIRIR)进行释光年代学研究,释光测年结果与野外地层顺序基本一致。根据冲洪积层沉积时代划分为间冰期(248~196 ka、110~73 ka)沉积、冰期-间冰期转换时期(177~94 ka、142~94 ka)沉积和冰期(26~18 ka)沉积,表明强降水事件在间冰期和冰期-间冰期过渡的气候转换期多发,特别是110~94 ka时段内。研究结果与中国各地多种载体所记录的气候变化过程相互佐证,进一步说明研究区水文、气候变化过程是对全球环境变化的响应。本研究补充了黄河下游地区冲洪积物年代学数据,不仅有利于揭示区域环境演化对全球气候变化的响应机制,建立与全球气候环境变化的可能联系;同时为区域综合开发、生态环境修复和保护提供可靠的数据参考。The alluvial sediments preserved in the loess along the lower reaches of the Yellow River documented the hydrological and climatic changes processes.Presently,the researches on the identification and hydrological reconstruction of alluvial events in the basins of the Yellow River mainly focus on the middle and upper reaches,while the studies on alluvial events in the lower reaches of the Yellow River are scare.Typical alluvial materials are generally preserved in the loess between the north Central Shandong Mountains and the south bank of the lower reaches of the Yellow River.The research region is located in the humid and semi-humid East Asian monsoon climate region with annual average precipitation is 700~900 mm concentrated from June to September.There are generally horizontal,spatially traceable,one or more obvious alluvium or diluvium preserved in the loess section.In this paper,four representative loess sections were investigated by luminescence dating,including Xiao Zhang Zhuang(36°33’21″N,118°29’25″E;4 luminescence samples were collected within the thickness of 635 cm),Zhi Dong Yu(36°10’47″N,116°20’45″E;2 luminescence samples were collected within the thickness of 450 cm),Jiu Long Yu(36°33’20″N,118°29’17″E;2 luminescence samples were collected within the thickness of 290 cm)and Tao Yu Cun(36°08’16″N,116°19’39″E;2 luminescence samples were collected within the thickness of 350 cm)sections.Gravels of these alluvial sediments with the thickness of 20~70 cm were mainly limestone with poor sorting,roundness and diameter less than 50 cm.Totally,10 luminescence samples were collected to obtain the buried ages of the alluvial sediments.Two samples(TYC-1 and TYC-2)of alluvial sediments were studied by using quartz single aliquot regenerative dose protocol(SAR)and the remaining 8 samples were measured by potassium K-feldspar infrared post infrared luminescence dating method(pIR200IR290).The luminescence dating results were basically consistent with the field stratigraphic seq

关 键 词：冲洪积物 释光测年 黄河下游 鲁中山地 气候变化 

分 类 号：P931.1[天文地球—自然地理学] P597.3