Decoupling of the detrital linkage between proximal dunefields and early and middle Pleistocene accumulation in the Chinese Loess Plateau: evidence from the Badain Jaran and Tengger sandy deserts
Decoupling of the detrital linkage between proximal dunefields and early and middle Pleistocene accumulation in the Chinese Loess Plateau: evidence from the Badain Jaran and Tengger sandy deserts
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中国黄土高原近端沙丘场与早、中更新世堆积物之间碎屑联系的解耦：来自巴丹吉林和腾格里沙漠的证据
DOI：
10.1016/j.quascirev.2021.107026
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发表时间：
2021-07
影响因子：
4
通讯作者：
Chen Fahu
中科院分区：
文献类型：
--
作者：
Fan Yuxin;Wang Fei;Yang Guangliang;Cai Qingsong;Zhang Qingsong;Li Zhenjun;Long Xiao;Li Xiaohu;Chen Fahu
黄土高原上风向沙丘是黄土高原沉积物的主要来源。为了验证这一推论，我们利用巴丹吉林沙漠中部（BJD）碎屑锆石U-Pb年龄谱进行了源示踪研究。结果表明，自1.1Ma以来，青藏高原中部沉积物主要来自戈壁-阿尔泰山脉，而北方高原（NTP）在0.7Ma和现在则占主导地位。结合腾格里沙漠（TD）的研究结果，我们认为在2.35-0.62 Ma期间，BJD和TD近端沙丘区的中部主要是由GAM成因的沉积物形成的，而在0.36 Ma之后，还加入了NTP成因的沉积物。在中部和南部CLP的黄土沉积物中的BJD和TD的中部的沉积物的原始源区的比较表明，近端沙丘的BJD和TD的不是在早中第四纪输送到CLP的灰尘的主要来源。根据我们的研究结果，结合以往的研究证据，我们提出，NTP衍生的沉积物占主导地位的积累在CLP的大部分第四纪，而在2.35-0.62 Ma的近端沙丘，包括BJD和TD，只作为水库的沉积物主要从GAM放气和侵蚀。从本质上讲，这些桑迪沙漠起到了转运站的作用，在10.36 Ma之后，这些沙漠接收了更多的NTP衍生沉积物，随后向包括CLP在内的顺风地区提供了淤泥。
The dunefields upwind of the Chinese Loess Plateau (CLP) are widely regarded as the major source of the sediments of the CLP. To test this inference, we conducted a source tracing study using U–Pb age spectra of detrital zircons from the central Badain Jaran Desert (BJD). The results reveal that since 1.1 Ma the sediments in the central BJD have originated predominantly from the Gobi-Altay Mountains (GAMs), with a dominant Northern Tibetan Plateau (NTP) provenance at ∼0.7 Ma and at the present. Together with a previous study of the neighboring Tengger Desert (TD), our results support the conclusion that during 2.35–0.62 Ma the central parts of the proximal dunefields of the BJD and TD acted as reservoirs of sediments deflated mainly from strata with a GAMs-origin, with the addition of NTP-derived sediments after 0.36 Ma. Comparison of the original provenance areas of sediments in the central parts of the BJD and TD with the loess deposits in the central and southern CLP indicates that the proximal dunefields of the BJD and TD were not the dominant sources of dust transported to the CLP during early to middle Quaternary. Based on our results, combined with evidence from previous studies, we propose that NTP-derived sediments dominated accumulation in the CLP for most of the Quaternary, while during 2.35–0.62 Ma the proximal dunefields, including the BJD and TD, acted only as reservoirs of sediments deflated and eroded predominantly from the GAMs. Essentially, these sandy deserts functioned as transfer stations, which, after ∼0.36 Ma, received increased amounts of NTP-derived sediments and subsequently supplied silt to downwind areas, including the CLP.
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