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An integrated tectono-sedimentary analysis of the Ordos basin and its sub-basin components through the Triassic and Jurassic.

机译:通过三叠纪和侏罗纪对鄂尔多斯盆地及其次盆地成分进行了综合的构造-沉积沉积分析。

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摘要

The Ordos basin is a large, non-marine sedimentary basin presently located in north-central China. During the Paleozoic and Mesozoic, the basin was located at the center of Asian continental assembly, and was a focused zone of deformation. Throughout its evolution, stress has been accommodated by deformation on the Ordos basin margins, while the interior has remained stable. Deformation of the margins generated narrow perimeter basins along the Triassic northwest and Jurassic northeast margins. The south and southwestern Ordos basin was a large subsiding Triassic-Jurassic foreland connected to a flat-laying Ordos basin interior, which remains undeformed with approximately 4 km of sedimentary fill.;In this study, detailed fluvial and lacustrine stratigraphy was used to create depositional frameworks for the perimeter sub-basins. Each was analyzed using the frameworks, available structural constraints and paleoclimate data. Previous studies of the northern Ordos sub-basins interpreted the basins as extensional half-grabens, which do not agree with their tectonic context. In this study, the data and interpretations of the sub-basins refine the previous interpretations, and (1) offer alternative scenarios of sub-basin development, (2) integrate the development scenarios of the sub-basins into the history of the larger Ordos basin, and (3) suggest a transtensional boundary along the northern Ordos basin.;On the south and west margins and the Ordos basin interior, observations and interpretations made in this study were used in conjunction with available published data. This study shows that a large lake formed in a foreland depression along the south and southwestern margins. It expanded to the northeast from the Late Triassic through the Middle Jurassic to occupy the southern half of the Ordos basin.;The detailed analyses of the basin margins and interior are used to develop a comprehensive understanding of the tectono-sedimentary evolution of an integrated Ordos Basin system. This study helps to constrain the Triassic-Jurassic tectonic setting for the Ordos basin within the evolution of the north China region during the early Mesozoic continental assembly of Asia.
机译:鄂尔多斯盆地是目前位于中国中北部的一个大型非海洋沉积盆地。在古生代和中生代期间,该盆地位于亚洲大陆集结的中心,是变形的一个集中区域。在整个演化过程中,应力一直通过鄂尔多斯盆地边缘的变形来承受,而内部却保持稳定。边缘的变形沿三叠纪西北缘和侏罗纪东北缘产生了狭窄的外围盆地。鄂尔多斯盆地的南部和西南部是大型的三叠纪-侏罗纪前陷沉降区,与平坦的鄂尔多斯盆地内部相连,但仍未变形,沉积物充填约4 km。外围子盆地的框架。使用框架,可用的结构限制条件和古气候数据对每种数据进行了分析。先前对鄂尔多斯北部次盆地的研究将这些盆地解释为伸展的半岩盆,这与它们的构造背景不符。在本研究中,子流域的数据和解释完善了以前的解释,并且(1)提供了子流域开发的替代方案,(2)将子流域的开发方案整合到大型鄂尔多斯的历史中(3)提出了鄂尔多斯盆地北部的一条张性界线。在南,西边界和鄂尔多斯盆地内部,本研究的观察和解释与已有的数据结合使用。这项研究表明,一个大湖在南部和西南边缘的前陆洼地中形成。它从三叠纪晚期到中侏罗世向东北扩展,占据了鄂尔多斯盆地的南半部。对盆地边缘和内部进行了详细的分析,以全面了解整个鄂尔多斯盆地的构造-沉积演化。盆地系统。这项研究有助于在亚洲中生代早期大陆集结期间将鄂尔多斯盆地的三叠纪-侏罗纪构造背景限制在华北地区的演化范围内。

著录项

  • 作者

    Van Alstine, Jana M.;

  • 作者单位

    The University of Wisconsin - Madison.;

  • 授予单位 The University of Wisconsin - Madison.;
  • 学科 Geology.;Plate Tectonics.;Sedimentary Geology.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 221 p.
  • 总页数 221
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:37:27

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