A middle Pleistocene to Holocene perspective on sediment sources for the Tengger Desert, China
A middle Pleistocene to Holocene perspective on sediment sources for the Tengger Desert, China
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DOI：
10.1016/j.catena.2023.107119
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发表时间：
2023-07
期刊：
影响因子：
6.2
通讯作者：
Maotong Li;J. Nie;Zaijun Li;A. Pullen;J. Abell;Haobo Zhang;Cody A. McMechen;B. Pan
中科院分区：
文献类型：
--
作者：
Maotong Li;J. Nie;Zaijun Li;A. Pullen;J. Abell;Haobo Zhang;Cody A. McMechen;B. Pan
灰尘在全球生物地球化学和碳循环中发挥着至关重要的作用。中国北方的沙漠在整个第四纪时期一直是东亚重要的沙尘源。腾格里沙漠是中国北方主要的干旱产尘区之一，据认为在更新世中晚期开始形成现在的形态。因此，了解腾格里沙漠的形成性质以及相关的沉积物输入、储存和输出对于区域乃至全球气候具有重要意义。这里报告的现代和中晚更新世腾格里沙漠沉积物的 U-Pb 碎屑锆石年代学数据支持源自源自祁连山的石羊河流域与当地基底隆起和戈壁阿勒泰源侵蚀的沉积物的混合。这种解释与认为这个时代的沉积物主要是从干旱的东亚大陆内陆逆风输送到腾格里沙漠的观点不同。我们注意到，这一分析表明腾格里沙漠、巴丹吉林沙漠和毛乌素沙漠第四纪沉积物有一个共同的来源，其中这些沙漠接收了来自祁连山和青藏高原东北部的河流沉积物。这一观测结果强调了东亚夏季风边缘的高海拔降水对于驱动东亚大陆内陆第四纪中晚期荒漠化过程中沉积物供应的重要性。
Dust plays a critical role in global biogeochemical and carbon cycles. The deserts of northern China have been important East Asian dust sources throughout the Quaternary. The Tengger Desert, one such major arid dust-producing region in northern China, is thought to have started resembling its current form during the middle to late Pleistocene. As such, understanding the nature of the Tengger Desert’s formation and the associated import, storage, and export of sediments are consequential for the regional, and potentially global, climate. The U-Pb detrital zircon geochronology data reported here from both present-day and middle to late Pleistocene Tengger Desert sediments support derivation from the Shiyang River system sourced from the Qilian Mountains mixed with sediments eroded from local basement uplifts and Gobi Altay sources. This interpretation is different from the view that sediments of this age were primarily transported to the Tengger Desert from the arid East Asian continental interior upwind. We note that this analysis suggests a common provenance for Quaternary sediments in the Tengger, Badain Jaran, and Mu Us Deserts wherein these deserts received riverine-sourced sediments from the Qilian Mountains and northeastern Tibetan Plateau. This observation highlights the importance of precipitation at elevation along the present-day margin of the East Asian summer monsoon in driving sediment supply during the middle to late Quaternary desertification within the East Asian continental interior.