摘要
胶东半岛北部海滨和山东中部山区北麓沉积了典型的风尘黄土,详细记录了晚更新世以来的气候变化,然而有关这些黄土究竟来自哪里,目前仍处于争议之中.锆石是黄土中常见的副矿物,其U-Pb年龄谱对比被广泛用于黄土的物源示踪研究.基于此,利用激光剥蚀电感耦合等离子质谱仪(LA-ICP-MS)对上述地区晚更新世典型的黄土剖面开展碎屑锆石(n=420)微区原位U-Pb年龄分析,结合Kolmogorov-Smirnov统计方法的多维判别图和前人已经发表的研究结果,发现胶东半岛北部海岸和山东中部山地北麓东段的晚更新世黄土主要来自渤海裸露的大陆架和华北平原的碎屑物质,受中国西北内陆干旱区的影响较小,但由于地理位置的差异,山东中部山地北麓西段的晚更新世黄土具有黄河下游和黄土高原的物质信号,而与晚更新世渤海末次冰期裸露在海底的沉积物的物源关系较弱.
The thick loess-palaeosol sequences in the Jiaodong Peninsula and Central Shandong mountains provide high-resolution records of Late Quaternary climate change of the Shandong Province.However,it is still controversial as to where they came from.This study presents systematically the detrital zircon U-Pb age(n=420)and multi-dimensional discrimination diagram results of statistical method.It is shown that the North China Plain and Bohai shelf material served as a major dust supply for the loess in the Jiaodong Peninsula and eastern parts of the Central Shandong mountains during the Late Pleistocene.By contrast,the major dust source for the loess in the western parts of the Central Shandong mountains is mainly derived from the sediments exposed on the floodplain of the lower reaches of the Yellow River and the Loess Plateau during the Late Pleistocene.They have no provenance relationship with the sediments exposed on the sea floor in the Bohai Sea at the same time.
作者
林旭
刘静
吴中海
刘维明
李长安
李志文
王世梅
刘海金
陈济鑫
Lin Xu;Liu Jing;Wu Zhonghai;Liu Weiming;Li Chang’an;Li Zhiwen;Wang Shimei;Liu Haijin;Chen Jixin(College of Civil Engineering and Architecture,China Three Gorges University,Yichang 443002,China;School of Earth System Science,Tianjin University,Tianjin 300072,China;Key Laboratory of Neotectonic Movement and Geohazards,Ministry of Natural Resources;Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China;School of Earth Sciences,China University of Geosciences,Wuhan 430074,China;School of Environmental and Chemical Engineering,Foshan University,Foshan 528225,China 7.School of Earth Sciences,East China University of Technology,Nanchang 330013,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2021年第9期3230-3244,共15页
Earth Science
基金
国家自然科学基金项目(Nos.41702178,41972212)
湖南省自然科学基金项目(No.2019JJ40198).
