| 黄河上游物质在新近纪未流入晋陕峡谷* |
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| 引用本文： | 林旭,李玲玲,刘海金,陈济鑫.黄河上游物质在新近纪未流入晋陕峡谷*[J].古地理学报,2022,24(3):568-582. |
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| 作者姓名： | 林旭 李玲玲 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;2.三峡库区地质灾害教育部重点实验室(三峡大学),湖北宜昌 443002;3.东华理工大学地球科学学院,江西南昌 330006 |
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| 摘 要： | 河流的出现是其流域内构造活动和气候变化综合作用的结果。晋陕峡谷位于黄河上游和中游的衔接部位,对于研究上游黄河何时进入晋陕峡谷具有无可替代的地理位置优势。目前对于黄河何时进入晋陕峡谷一直存有较大争议,存在中新世、上新世和更新世几种主要观点。基于此,作者对晋陕峡谷北段新近纪地层开展碎屑锆石U-Pb年龄分析和沉积相观察。首次报道了磨扇沟、大烟墩、高家窨子3个剖面270颗碎屑锆石 U-Pb 年龄结果。通过和区域内潜在源区进行对比,以及古流向都是自东向西的现象,判定磨扇沟和大烟墩2个剖面的物质来自近源的吕梁山北段; 高家窨子剖面底部的砂岩流向为自南向北,其物源区来自鄂尔多斯地块北部中生代地层。结合这些地层已经报道的古地磁年龄,认为晋陕峡谷北段在6.2~3.7 Ma期间以近源堆积为主,是对青藏高原隆升远程效应和东亚夏季风增强的沉积响应,而和黄河上游物质不存在物源联系。
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| 关 键 词： | 晋陕峡谷 锆石 U-Pb年龄 黄河演化 |
| 收稿时间： | 2021-11-06 |
Sediments from the upper reaches of Yellow River did not enter into Shanxi-Shaanxi Gorge in the Neogene |
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| Lin Xu,Li Ling-Ling,Liu Hai-Jin,Chen Ji-Xin.Sediments from the upper reaches of Yellow River did not enter into Shanxi-Shaanxi Gorge in the Neogene[J].Journal of Palaeogeography,2022,24(3):568-582. |
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| Authors: | Lin Xu Li Ling-Ling Liu Hai-Jin Chen Ji-Xin |
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| Institution: | 1.School of Civil Engineering and Architecture,China Three Gorges University,Hubei Yichang 443002,China;2.Key Laboratory of Geological Hazards on Three Gorges Reservoir Area,Ministry of Education, China Three Gorges University,Hubei Yichang 443002,China;3.School of Earth Sciences,East China University of Technology,Nanchang 330006,China |
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| Abstract: | The emergence of rivers is the result of the tectonic activity and climate change in their basins. The Shanxi-Shaanxi Gorge is located at the junction of the upper and middle reaches of the Yellow River,which has irreplaceable geographical advantages for studying when the upper Yellow River enters into Shanxi-Shaanxi Gorge. At present,there is great controversy about when the Yellow River enters the Shanxi-Shaanxi Gorge,e.g.,the Miocene,Pliocene and Pleistocene. In this case,we carried out detrital zircon U-Pb age analysis and sedimentary facies observation on the Late Miocene and Pliocene strata in the northern parts of the Shanxi-Shaanxi Gorge. New 270 detrital zircons U-Pb ages are obtained from the Moshangou,Dayandun and Gaojiayinzi sections. Given the paleocurrent flow direction is from east to west and comparison of U-Pb ages with that of the potential source area,we conclude that the sediments of Moshangou and Dayandun profiles were derived from the proximal source of the northern parts of the Lüliang Mountain. The provenance analysis of the sandstone at the bottom of the Gaojiayinzi section indicate a northward sediment transport direction,and the sediments were mainly derived from the Mesozoic sedimentary strata in the northern Ordos block. Combined with the reported paleomagnetic ages of these strata,the northern section of the Shanxi-Shaanxi Gorge was dominated by near-source accumulation during 6.2~3.7 Ma,which is a response to the remote effect of the uplift of the Tibetan Plateau and the enhancement of the East Asian summer monsoon,and excludes the provenance relationship with the upper reaches of the Yellow River. |
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| Keywords: | Shanxi-Shaanxi Gorge zircon U-Pb age Yellow River evolution |
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