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首页> 外文期刊>American Journal of Science >CENOZOIC MULTIPLE-PHASE TECTONIC EVOLUTION OF THE NORTHERN TIBETAN PLATEAU: CONSTRAINTS FROM SEDIMENTARY RECORDS FROM QAIDAM BASIN, HEXI CORRIDOR,AND SUBEI BASIN, NORTHWEST CHINA
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CENOZOIC MULTIPLE-PHASE TECTONIC EVOLUTION OF THE NORTHERN TIBETAN PLATEAU: CONSTRAINTS FROM SEDIMENTARY RECORDS FROM QAIDAM BASIN, HEXI CORRIDOR,AND SUBEI BASIN, NORTHWEST CHINA

机译：藏北高原新生代多相构造演化：河西走廊柴达木盆地和苏北盆地沉积记录的制约

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An integrated research of sedimentology, stratigraphy, and provenance analysis on eleven sedimentary sections from the Qaidam basin, Hexi Corridor, and Subei basin representing ～36 km Cenozoic strata provides a detailed record of the northern Tibetan Plateau growth since the early Eocene. Sections are divided into three groups based on age, geological similarities, and geographical locations. Group One includes three early Eocene–late Miocene sections from the northern Qaidam basin; Group Two contains four sections along the Altyn Tagh fault (ATF) which preserve a complete stratigraphic record from the Oligocene to late Miocene; Group Three contains the four youngest sections investigated from the northeastern Qaidam basin and Hexi Corridor which preserve a record since the middle Miocene to Quaternary. Together, the sections reveal a multiple-phase tectonic history of the northern Tibetan Plateau. The punctuated history can be divided into four phases. (1)The Eocene Lulehe Formation from the northern Qaidam basin is interpreted as a synorogenic conglomerate deposited by high-gradient depositional systems. Strong unimodal paleocurrent towards the southwest, coarse lithology and distinct, recognizable clast types constrain the sediment source within the North Qaidam and South Qilian terranes, indicating activity on inferred thrust faults within the North Qaidam and South Qilian terranes in response to the initial India-Eurasia collision. The activity on these thrust faults continued through the late Eocene. (2) The early Oligocene conglomerate from Group Two formed in response to the sinistral transpression related to motion on the ATF, suggesting inception of substantial slip on the ATF in the early Oligocene in order to accommodate the continuing indentation of India into Eurasia. (3) Oligocene–early Miocene fine-grained fluvio-lacustrine sediments from Groups One and Two formed as the result of development of internal drainage systems in the Qaidam basin in response to the large-amplitude slip motion on the ATF. Paleocurrents collected from the Oligocene–early Miocene strata of Group One are northwest-directed, pointing towards the ATF, consistent with the pre-existing subsurface data showing the shift of depocenter from along North Qaidam and South Qilian terranes toward the ATF. (4) All eleven sections preserve a post-early Miocene upward-coarsening sequence, consistent with the extensive crustal shortening and topographic growth across the northern Tibetan Plateau.
机译：柴达木盆地，河西走廊和苏北盆地代表新生代地层约36 km的11个沉积剖面的沉积学，地层学和物源分析的综合研究，提供了始于始新世以来青藏高原北部生长的详细记录。根据年龄，地质相似性和地理位置，这些区域分为三组。第一组包括来自柴达木盆地北部的三个始新世晚期中新世剖面。第二组沿阿尔金断裂带（ATF）包含四个部分，保留了从始新世到中新世的完整地层记录。第三组包含从柴达木盆地东北部和河西走廊调查的四个最年轻的断面，这些断面保持了自中新世中期至第四纪以来的记录。这些部分共同揭示了青藏高原北部的多相构造历史。标点符号的历史可以分为四个阶段。 （1）来自柴达木盆地北部的始新世鲁勒河组被解释为由高梯度沉积系统沉积的同生砾岩。西南强单峰古流，粗糙的岩性和独特的，可识别的碎屑类型限制了北柴达木和南祁连山脉内的泥沙源，表明对北柴达木和南祁连山脉内推断的逆冲断层的活动是对初始印度-欧亚大陆的响应碰撞。这些逆冲断层的活动一直持续到新世晚期。 （2）第二组的早渐新世砾岩是为响应与ATF运动有关的窦性压迫而形成的，这表明早渐新世初期ATF开始大量滑落，以适应印度不断向欧亚大陆的缩进。 （3）柴达木盆地内部排水系统发展的结果是，响应ATF的大振幅滑移，形成了第1组和第2组的渐新世-中新世早期细粉状河流湖泊沉积物。从第一组的渐新世—中新世早期地层收集的古流是西北方向的，指向ATF，这与先前存在的地下数据一致，表明沉积中心从北柴达木和南祁连地层向ATF转移。 （4）全部11个断面都保留了中新世后早期的向上粗化序列，这与青藏高原北部广泛的地壳缩短和地形生长相一致。

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