Cenozoic basin-filling evolution of the SW Tarim Basin and its implications for the uplift of western Kunlun: Insights from (seismo)stratigraphy
Cenozoic basin-filling evolution of the SW Tarim Basin and its implications for the uplift of western Kunlun: Insights from (seismo)stratigraphy
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DOI：
10.1016/j.palaeo.2020.110149
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Chunyang Li;Hanlin Chen;Fengqi Zhang;Xiubin Lin;Xiaogan Cheng;Yong Li;Cai Chen;Liangshang Zhang-Liangshang
中科院分区：
文献类型：
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作者：
Chunyang Li;Hanlin Chen;Fengqi Zhang;Xiubin Lin;Xiaogan Cheng;Yong Li;Cai Chen;Liangshang Zhang-Liangshang
西昆仑山及其毗邻的塔里木盆地西南部是新生代强烈变形的青藏高原的西北边界，对研究青藏高原西北部的生长过程具有重要意义。通过对塔里木盆地西南部新生界克里阳层序剖面的地层学研究和地震反射剖面的地震地层学分析，揭示了塔里木盆地西南部的沉积演化和盆地充填过程。研究结果表明，在阿尔塔什组-巴什布拉克组沉积时期，沉积相由海相向克孜勒依组-西域组沉积时期的陆相转变。这一位移与南昆仑的隆升和沿着塔里木盆地西南部前陆盆地沉降的开始有关。克孜洛依组至西峪组为一个向上变粗的层序，被一个次级的向上变薄的安眷组层序所打断。结合阿图什组沉积期以来沉积中心向北迁移了至少56 km，以及前人对盆地内变形传播的研究，这些结果表明西昆仑的构造负荷向北传播到北昆仑，表明青藏高原西北部自这一时期以来发生了扩张。认为西昆仑沿着青藏高原西北部与塔里木盆地之间的地壳上边界是一个向北移动的特征。这将支持这样的假设，即塔里木板块的下部（如果从沉积中心向北迁移的幅度计算，则>~56 km）已经向南俯冲到西昆仑之下。
The western Kunlun Mountains and the adjacent southwestern Tarim Basin define the northwestern boundary of the intensely deformed Cenozoic Tibetan Plateau, and thus should bear important information on the growth processes of the NW Tibetan Plateau. In this study, the integration of a stratigraphic investigation of the Cenozoic Keliyang succession section and a seismostratigraphic analysis on the seismic reflection profile reveal the sedimentary evolution and basin-filling processes of the southwestern Tarim Basin. Our results suggest a significant depositional shift from marine facies during the depositional periods of the Aertashi to Bashibulake Formations to continental facies during the depositional periods of the Keziluoyi to Xiyu Formations. This shift, which corresponds to southward depositional thickening, has been attributed to the uplift of South Kunlun and the onset of foreland basin subsidence along the southwestern Tarim Basin. Strata from the Keziluoyi to Xiyu Formations form an upward-coarsening sequence that is interrupted by a subordinate upward-thinning sequence in the Anjuan Formation. These results, in combination with the northward migration of the depocenter by at least ~56 km since the depositional period of the Artux Formation and previous studies on basinward deformation propagation, demonstrate that the tectonic loading of the western Kunlun has propagated northward to North Kunlun, which suggest expansion of the NW Tibetan Plateau since this period. We posit that the upper-crustal boundary between western Kunlun along the NW Tibetan Plateau and the Tarim Basin is a northward movable feature. This would support the hypothesis that the substantial lower Tarim Plate (>~56 km if calculated from the magnitude of the northward depocenter migration) has underthrusted southward beneath western Kunlun.