中国西部黄土高原黄土沉积的第四纪产状变化:从碎屑锆石的U-Pb年龄谱中获得的启示

IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL Palaeogeography, Palaeoclimatology, Palaeoecology Pub Date : 2024-09-10 DOI:10.1016/j.palaeo.2024.112498
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引用次数: 0

摘要

位于六盘山西侧的中国黄土高原西部地区连接着青藏高原和北部干旱区的沙漠。该地区是了解青藏高原构造隆升与地表过程(侵蚀和气候)耦合关系的关键地区;然而,该地区第四纪风尘源的变化仍不确定,给分析带来了困惑。本文利用第四纪中石油西部会宁风积层序中的12个黄土层的锆英石U-Pb年代测定,开展了风尘源溯源研究,重建了第四纪风尘源变化的历史,并进一步探讨了风尘源的驱动机制。结果表明,中石油西部风化尘主要来自青藏高原东北缘。在1.8-1.66Ma时期,主源区为青藏高原东北缘,与青藏高原C期隆升事件相对应。主源区在 1.5-1.4 Ma 左右过渡到戈壁阿勒泰山脉(GAMs)。这一转变表明,青藏高原的构造隆升在C事件结束后进入了一个停滞期,导致东亚冬季季风从戈壁阿勒泰山脉搬运更多的碎屑物质。1.24Ma之后,主要的源区突然从GAMs转变为NTP,并一直持续到0.04Ma。昆黄运动引起的地形起伏似乎是源区突变的主要原因。根据我们的研究结果和以往的研究证据,第四纪时期发生的源变化是对构造事件和气候变化的综合反应。中西部地区锆石年龄谱的比较进一步支持了高原冬季季风是中西部地区风化尘主要迁移系统的观点。
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Quaternary provenance changes in the loess deposits of the western Chinese Loess Plateau: Insights from U-Pb age spectra of detrital zircon

The western region of the Chinese Loess Plateau (CLP) on the western side of the Liupan Mountains connects the Tibetan Plateau with the deserts of the northern arid zones. This region is key for understanding of the coupled relationship between tectonic uplift and surface processes (erosion and climate) on the Tibetan Plateau; however, the variation of Quaternary wind-dust sources in the region remains uncertain, confounding analysis. In this paper, we conduct a source tracing investigation using detrital zircon U-Pb dating of 12 loess layers from the Huining aeolian sedimentary sequence of the western CLP, reconstruct the history of provenance changes during the Quaternary Period, and further explore driving mechanisms. Results show that aeolian dust from the western CLP is mainly from the northeastern margin of the Tibetan Plateau (NTP). At 1.8–1.66 Ma, the main source region was the NTP, which corresponds to the Episode C uplift event of the Tibetan Plateau. The dominant source area transitioned to the Gobi Altay Mountains (GAMs) around 1.5–1.4 Ma. This shift suggests that the tectonic uplift of the Tibetan Plateau had entered a period of stasis following the conclusion of Episode C, leading to increased transport of detrital material from the GAMs by the East Asian Winter Monsoon. After 1.24 Ma, the dominant source region abruptly changed from the GAMs to the NTP and lasted until 0.04 Ma. The topographic fluctuations caused by the Kunhuang Movement appears to have been the main reason for the sudden source change. Based on our results and evidence from previous studies, the source changes that occurred during the Quaternary Period were in response to a combination of tectonic events and climate change. Comparison of zircon age spectra between the eastern and western CLP further support the idea that the Plateau Winter Monsoon was the main transport system for aeolian dust in the western CLP.

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来源期刊
CiteScore
5.90
自引率
10.00%
发文量
398
审稿时长
3.8 months
期刊介绍: Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.
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