| 末次冰期山东黄土物源研究: 来自碎屑锆石U-Pb年龄的约束 |
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| 引用本文： | 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.末次冰期山东黄土物源研究: 来自碎屑锆石U-Pb年龄的约束[J].地球科学,2021,46(9):3230-3244. |
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| 作者姓名： | 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 |
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| 作者单位： | 1.三峡大学土木与建筑学院, 湖北宜昌 443002 |
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| 基金项目： | 国家自然科学基金项目41702178国家自然科学基金项目41972212湖南省自然科学基金项目2019JJ40198 |
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| 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.
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| 关 键 词： | 胶东半岛 山东中部山区 黄土 锆石U-Pb年龄 第四纪 地层学 |
| 收稿时间： | 2020-10-10 |
Provenance of the Loess in Shandong Province (Eastern China) during the Last Ice Age:Constraints from the U-Pb Age of Detrital Zircons |
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| Lin Xu,Liu Jing,Wu Zhonghai,Liu Weiming,Li Chang'an,Li Zhiwen,Wang Shimei,Liu Haijin,Chen Jixin.Provenance of the Loess in Shandong Province (Eastern China) during the Last Ice Age:Constraints from the U-Pb Age of Detrital Zircons[J].Earth Science-Journal of China University of Geosciences,2021,46(9):3230-3244. |
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| Authors: | Lin Xu Liu Jing Wu Zhonghai Liu Weiming Li Chang'an Li Zhiwen Wang Shimei Liu Haijin Chen Jixin |
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| Abstract: | 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. |
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