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首页> 外文期刊>Journal of Asian earth sciences >Late Permian tectono-sedimentary setting and basin evolution in the Upper Yangtze region, South China: Implications for the formation mechanism of intra-platform depressions
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Late Permian tectono-sedimentary setting and basin evolution in the Upper Yangtze region, South China: Implications for the formation mechanism of intra-platform depressions

机译：南华山上长江地区的已故的二叠系构图 - 沉积和盆地演变：对平台内凹陷的形成机制的影响

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摘要

The Upper Yangtze region in the northwestern part of the South China Block was situated in a relatively active tectonic zone during the Late Permian. The expansion of the South Qinling and Jinshajiang-Ailaoshan oceans to the north and south, active mantle plumes, and related magma upwelling in the plate margins have significantly influenced the evolution of this area. The sediments of the Upper Permian Wujiaping Formation and Changxing Formation developed in the Upper Yangtze region are typical intracratonic basin sequences, which records the sedimentological and structural development during this period. To reconstruct the tectonic and paleogeographic framework of the Upper Yangtze region and to better understand the formation mechanism of intra-plate depressions, this study integrates drill core, well log, cross-sections and outcrop data to examine the lithological associations, stratigraphic thicknesses, and sedimentary facies, and further reconstruct the paleogeographic framework of the Late Permian sedimentary successions. Moreover, we integrate this data with 2D and 3D seismic data to describe the tectono-sedimentary framework of the intra-platform depressions. Based on the results, three primary tectono-sedimentary stages are delineated: (1) the Wujiaping Formation documents a rapid basalt eruption event on the southwestern edge of the Upper Yangtze region at the beginning of the Wuchiapingian stage, followed by a marine transgression which occurred from the northeast to the southwest with initial intra-platform depressions formed on the northern basin; (2) during the early Changsingian stage, the Upper Yangtze region comprised a variety of environments, including tidal flat-coast, mixed-platform, open-platform, slope, deep-water shelf, and platform margin reef and shoal, with a rapid sea-level rise and (3) the sea level reached its peak and then slowly dropped. The reefs developed along the intra-platform depressions during the late Changsingian stage. We suggest that the formation and evolution of the Late Permian basin sequences in the Upper Yangtze region were controlled by the plutonic magmatic activities and regional crustal extension. The proposed model has important implications for interpreting the rapid transformation of intra-platform depressions from uplift to depression, as well as the tectono-sedimentary differentiation framework in intracratonic basins.
机译：南中国街区西北部的上部长江地区位于二叠纪后期的一个相对活跃的构造区。南秦岭和金沙江 - 艾拉山海洋向北部和南部，活跃的地幔羽毛和相关岩浆中升值的膨胀率较大地影响了这一领域的演变。上长江地区开发的武家武家地层和长兴形成的沉积物是典型的肠盆腔序列，在此期间记录了沉积学和结构性发展。为了重建上扬子地区的构造和古地理框架，并更好地了解板内凹陷的形成机制，本研究集成了钻机核心，井日志，横截面和露出数据来检查岩性关联，地层厚度和沉积相，进一步重建后期二叠纪沉积演替的古地理框架。此外，我们将该数据与2D和3D地震数据集成，以描述平台内凹陷的构造沉积框架。基于结果，三个主要构造沉积阶段划定：（1）武家地层在武伍宾田舞台开头的上长江地区西南边缘的快速玄武岩喷发事件，其次发生了从东北到西南部，在北部盆地形成了初始平台内凹陷; （2）在常春山初期，上扬子地区包括各种环境，包括潮汐扁平海岸，混合平台，开放式平台，斜坡，深水架和平台利润礁和浅滩，快速海平面上升和（3）海平面达到峰值，然后慢慢下降。珊瑚礁沿着平台内凹陷在晚期常春山舞台。我们建议，上长江地区后期杂交盆地序列的形成和演变由富型岩浆活动和区域地壳延伸来控制。该拟议模型对解释平台隆起抑郁症的快速转化具有重要意义，以及英内盆地中的构成沉积分化框架。

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  • 来源
    《Journal of Asian earth sciences》 |2021年第1期|104599.1-104599.21|共21页
  • 作者

    Huang Hanyu; He Dengfa; Li Yingqiang; Li Di; Zhang Yuying; Chen Jiajun;

  • 作者单位

    China Univ Geosci Sch Energy Resources Beijing 100083 Peoples R China|Minist Educ Key Lab Marine Reservoir Evolut & Hydrocarbon Enr Beijing 100083 Peoples R China;

    China Univ Geosci Sch Energy Resources Beijing 100083 Peoples R China|Minist Educ Key Lab Marine Reservoir Evolut & Hydrocarbon Enr Beijing 100083 Peoples R China;

    SINOPEC Explorat & Prod Res Inst Beijing 100083 Peoples R China;

    China Univ Geosci Sch Energy Resources Beijing 100083 Peoples R China|Minist Educ Key Lab Marine Reservoir Evolut & Hydrocarbon Enr Beijing 100083 Peoples R China;

    SINOPEC Explorat Branch Chengdu 610041 Peoples R China;

    China Univ Geosci Sch Energy Resources Beijing 100083 Peoples R China|Minist Educ Key Lab Marine Reservoir Evolut & Hydrocarbon Enr Beijing 100083 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Paleogeography; Changxing Formation; Seismic facies; Yangtze Block; Basin evolution;

    机译：古地理;长兴地层;地震相;长江块;盆地演变;

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