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首页> 外文期刊>Journal of Asian earth sciences >Early Pleistocene uplift of the northeastern Tibetan Plateau: Evidence from the Dunhuang Basin, NW China
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Early Pleistocene uplift of the northeastern Tibetan Plateau: Evidence from the Dunhuang Basin, NW China

机译：青藏高原东北部的早更新世隆升：来自中国西北敦煌盆地的证据

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摘要

The Cenozoic uplift of the Tibetan Plateau plays an important role in global climate change, basin-mountain geomorphology formation and desertification in western China. As an important component, the Early Pleistocene uplift process and its influence on the northeastern Tibetan Plateau has been controversial for many years. Quaternary synorogenic sediments within the Dunhuang Basin on the northeastern Tibetan Plateau record the details of plateau uplift. Detailed grain size analysis, rock magnetic properties, mudstone Cl-36 dating and Ar-40/Ar-39 detrital mica dating were conducted on the Quaternary alluvial-fluvial-lacustrine-aeolian sediments of the Dunhuang Basin. The Aksay section in the southern Dunhuang Basin is dominated by conglomerate, sandstone, siltstone and mudstone. Detrital mica Ar-40/Ar-39 ages show major age populations of 200-160 Ma, 400-200 Ma and 510-430 Ma from the northeastern Altyn Mountains. The results of Cl-36 ages and rock magnetic properties show that the Altyn Mountains rapidly uplifted at 1.16 Ma. From 1.16 to 0.80 Ma, the sedimentary environment was stable with two small-scale uplift pulses at ca. 1.03 Ma and 0.98 Ma. After 0.80 Ma, the climate became arid, and the Kumtag Desert formed in the Dunhuang Basin. These multistage uplifts are also widely found in the northeastern Tibetan Plateau. The Early Pleistocene uplift of the Altyn Mountains, corresponding to the Kunhuang Movement, resulted in the northeastern margin of the Tibetan Plateau reaching its present height and climate changeing towards drought in this region.
机译：青藏高原的新生代隆升在全球气候变化，盆地山地貌形成和中国西部荒漠化中起着重要作用。作为重要组成部分，早更新世隆升过程及其对东北青藏高原的影响一直引起争议。青藏高原东北部敦煌盆地内的第四系共生沉积物记录了高原隆升的细节。在敦煌盆地第四纪冲积-河流-湖泊-风沙沉积物中进行了详细的粒度分析，岩石磁学性质，Cl-36泥岩测年和Ar-40 / Ar-39碎屑云母测年。敦煌盆地南部的阿克赛断面以砾岩，砂岩，粉砂岩和泥岩为主。碎屑云母Ar-40 / Ar-39年龄显示东北阿尔廷山脉的主要年龄种群为200-160 Ma，400-200 Ma和510-430 Ma。 Cl-36年龄和岩石磁学性质的结果表明，阿尔金山脉在1.16 Ma处迅速隆升。从1.16到0.80 Ma，沉积环境稳定，大约有两个小规模的隆升脉冲。 1.03 Ma和0.98 Ma。 0.80 Ma之后，气候变得干旱，敦煌盆地形成了库姆塔格沙漠。这些多阶段隆升也广泛存在于青藏高原东北部。与昆皇运动相对应的阿尔廷山脉的早更新世隆升导致青藏高原的东北边缘达到目前的高度，该地区的气候向干旱转变。

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