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首页> 外文期刊>Journal of Asian earth sciences >Cenozoic tectonic and paleoenvironmental evolution of northwestern China: Evidence from two deep boreholes in the Jartai Basin
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Cenozoic tectonic and paleoenvironmental evolution of northwestern China: Evidence from two deep boreholes in the Jartai Basin

机译：西北地区的新生代构造和古环境演化：来自贾尔泰盆地两个深孔的证据

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摘要

To study the Cenozoic tectonic and paleoenvironmental evolution of northwestern China, we drilled two deep boreholes, JLT1 and JLT2, in the Jartai Basin. Magnetostratigraphy, stratigraphy studies were conducted to establish a chronological framework. Sedimentary facies were reconstructed using lithology, geophysical logs (gamma ray (GR) and resistivity (R)) and measurements of grain size, sediment color (L*, a* and b*) and magnetic susceptibility and its frequency dependence. The stratigraphic sequence of borehole JLT2 is similar to that of Paleogene sediments in basins along the northeastern Tibetan Plateau, which may be the result of the far-field effect of the uplift of the Tibetan Plateau during the Paleocene, via faulting activity. The results of borehole JLT1 indicate that the basin was occupied by alternating desert, lacustrine and alluvial fan environments since ca. 6.7 Ma. During ca. 6.7-3.6 Ma, alternations of aeolian sand and lacustrine facies may reflect climatic cooling and drying, and at that time the area may have been an important sediment source for the aeolian Red Clay of the Loess Plateau. During ca. 3.6-2.1 Ma, alluvial fan development also reflected the uplift of the northeastern Tibetan Plateau, and the area acted as a source region for dust supplied to the Loess Plateau and the Shanxi Graben. The alternations of aeolian sand and lacustrine deposits since ca. 2.1 Ma may have resulted from glacial-interglacial variations of the East Asian Monsoon. Since ca. 1.7 Ma, lacustrine deposition developed, because of the enormous discharge of the Yellow River into the Jartai Basin. A tectonic movement at ca. 0.8 Ma is reflected by lacustrine red clay at the top of borehole JLT1. After the mid-Pleistocene transition, the modern landscape of the Jartai Basin and its adjacent regions were formed.
机译：为了研究中国西北地区的新生代构造和古环境演化，我们在Jartai盆地钻了两个深孔JLT1和JLT2。进行了磁地层学，地层学研究以建立年代学框架。使用岩性，地球物理测井（伽马射线（GR）和电阻率（R））以及粒度，沉积物颜色（L *，a *和b *）和磁化率及其频率依赖性的测量来重建沉积相。 JLT2井眼的地层序列与青藏高原东北部盆地的古近纪沉积物序列相似，这可能是古新世隆升的远场效应通过断层活动造成的。钻孔JLT1的结果表明，该盆地自大约1986年以来一直处于交替的沙漠，湖相和冲积扇环境。 6.7马在约。 6.7-3.6 Ma，风沙和湖相的交替可能反映了气候的冷却和干燥，那时该地区可能是黄土高原风积红粘土的重要沉积物来源。在约。 3.6-2.1 Ma，冲积扇的发展也反映了青藏高原东北部的隆升，该地区是向黄土高原和山西格拉本供应粉尘的源区。自约公元以来风沙和湖相沉积的交替。 2.1 Ma可能是由于东亚季风的冰间变化造成的。由于ca。 1.7 Ma，由于黄河大量流入Jartai盆地，湖相沉积得以发展。约有一个构造运动。钻孔JLT1顶部的湖红粘土反射了0.8 Ma。在更新世中期过渡之后，形成了Jartai盆地及其邻近地区的现代景观。

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  • 来源
    《Journal of Asian earth sciences》 |2019年第15期|98-112|共15页
  • 作者

    Xu Qinmian; Yuan Guibang; Ding Jianxun; Zhang Wei; Xin Houtian; Deng Chenglong;

  • 作者单位

    China Geol Survey, Tianjin Ctr, Tianjin 300170, Peoples R China;

    China Geol Survey, Tianjin Ctr, Tianjin 300170, Peoples R China;

    Inner Mongolia First Geol Mineral Explorat Inst, Hohhot 010020, Inner Mongolia, Peoples R China;

    Taishan Univ, Sch Tourism, Tai An 271000, Shandong, Peoples R China;

    China Geol Survey, Tianjin Ctr, Tianjin 300170, Peoples R China;

    Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 10029, Peoples R China|Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China|Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    The Jartai Basin; Stratigraphic sequence; Magnetostratigraphy; Paleoenvironment;

    机译：Jartai盆地;地层层序;镁地层学;古环境;

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