Late Oligocene-Miocene mid-latitude aridification and wind patterns in the Asian interior
Late Oligocene-Miocene mid-latitude aridification and wind patterns in the Asian interior
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晚渐新世-中新世中纬度干旱化和亚洲内陆风型
DOI：
10.1130/g30776.1
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发表时间：
2010-06-01
期刊：
影响因子：
5.8
通讯作者：
Meng, Jin
中科院分区：
文献类型：
--
作者：
Sun, Jimin;Ye, Jie;Meng, Jin
亚洲内陆是北方最大的中纬度干旱带，因此研究该地区干旱化的起源和过去的程度越来越具有吸引力。考虑到亚洲内陆的复杂性，目前还不清楚风成沉积物的年龄和范围，以及什么样的风场导致了中纬度干旱带的形成。在这里，我们报告了新的风成记录广泛的第三纪风成沉积在一个地区远离中国黄土高原，巨大的准噶尔内陆盆地的中国西北部。我们的研究结果表明，最早的风成沉积开始约。24马。我们解释了准噶尔盆地第三纪风尘是由西风输送的，可能来自哈萨克斯坦地区;灰尘不同于来自蒙古和北方中国的沙漠，黄土高原上积累的冬季季风风输送的空气中的灰尘。这些结果进一步表明，至少自渐新世以来，中亚地区的气候模式与现在的气候模式相似。
The Asian interior has the largest mid-latitude arid zone in the Northern Hemisphere, and so has become increasingly attractive for studying the initiation and the past extent of aridification in this zone. Given the enormousness of the Asian interior, it remains unclear how old and extensive the eolian deposits might have been, and what wind regimes have been responsible for the formation of the mid-latitude arid zone. Here we report new eolian records of widespread Tertiary eolian deposits in a region far from the Chinese Loess Plateau, the giant Junggar inland basin of northwestern China. Our results demonstrate that the earliest eolian deposition initiated ca. 24 Ma. We interpret that the Tertiary eolian dust in the Junggar Basin was transported by westerly winds, possibly from areas in Kazakhstan; the dust differs from the airborne dust transported by winter monsoon winds from the deserts of Mongolia and northern China that accumulated on the Loess Plateau. These results further reveal that the climate pattern, similar to that of the present, has prevailed at least since the latest Oligocene in Central Asia.