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首页> 外文学位 >Structural styles and tectonic significance of Tian Shan foothill fold-thrust belts, northwest China.
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Structural styles and tectonic significance of Tian Shan foothill fold-thrust belts, northwest China.

机译：中国西北天山山麓褶皱冲断带构造样式及构造意义。

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摘要

The Tian Shan orogenic belt in northwestern China has experienced repeated episodes of deformation related to terrane collisions at the southern Asian margin throughout Phanerozoic time. The sedimentary basins flanking the Tian Shan preserve a sedimentary record of uplift and subsidence in the Tian Shan orogenic belt. Previous estimates of shortening across the Tian Shan have been based primarily on the relationship between physiographic relief and crustal thickening. A significant proportion of postulated total shortening is accommodated in the low-lying foreland basins flanking the high Tian Shan. The history and styles of deformation in the Tarim and Junggar sedimentary basins have been investigated through geologic interpretation of eight 1:250,000-scale satellite images and construction of a series of balanced structural cross-sections across the southern Tian Shan foreland.;Inherited structural grain inherited has influenced the structural styles of the northern Tarim craton since Carboniferous time. The Kalpin block preserves a Paleozoic stratigraphic succession unconformably overlain by Cenozoic strata. Neogene compression resulted in uplift and deformation of the Kalpin block and tectonic loading of adjacent depressions. Oblique compressive stresses from the southwest caused west- and east-vergent basement-involved thrusting in the Bachu uplift south of the Kalpin block. With clockwise rotation of the craton, stresses oriented nearly north-south produced south-vergent, basement-involved thrusting of the Kalpin block. Additional shortening was accommodated along south-vergent, imbricate thrusts deforming the sedimentary section. Balanced structural cross-sections indicate up to 50 km of total slip on these faults.;In the Kuqa depression, south-vergent Tian Shan nappes tectonically loaded the crust and created a migrating foredeep filled with clastic rocks derived from the range to the north. The depression preserves a Mesozoic and Cenozoic sedimentary sequence nearly 10 km thick. The sedimentary section is characterized by fault-propagation folding, thrusting, and salt movement. Cross-sections across the depression indicate slip in the sedimentary section totaling some 30 km; overthrusting and underthrusting of Tian Shan nappes accounts for an additional 10 to 20 km.;Shortening in the forelands accounts for up to 25% of the total across the orogenic belt.
机译：中国西北部的天山造山带在整个古生代时期经历了与南亚边缘地层碰撞有关的反复变形。天山两侧的沉积盆地保留了天山造山带隆升和沉降的沉积记录。先前对天山缩短的估计主要基于地貌学特征与地壳增厚之间的关系。假定的总缩短量中有很大一部分容纳在高天山两侧的低洼前陆盆地中。塔里木和准Jung尔沉积盆地的变形历史和样式已通过对八个1:25万比例的卫星图像进行地质解释并构建了横跨天山前陆的一系列平衡构造剖面的方法进行了研究。自石炭纪以来，遗传对塔里木克拉通北部的构造样式产生了影响。卡尔平地块保留了新生代地层不整合地覆盖的古生代地层演替。新近纪的压缩导致了卡尔平地块的隆升和变形以及邻近凹陷的构造载荷。来自西南方向的斜向压应力在卡尔平地块以南的巴楚隆起引起了西，东边界基底的逆冲作用。随着克拉通顺时针旋转，应力几乎向北偏南，产生了卡尔平区块向南延伸的，与基底有关的逆冲作用。沿南缘的岩性冲断作用进一步缩短了沉积部分。平衡的结构横截面表明这些断层上的总滑移量可达50 km。在库车depression陷中，南缘的天山滑石构造性地加载了地壳，并形成了一个充满前移的前倾深部，充满了从该山脉以北的碎屑岩。凹陷保留了近10 km厚的中生代和新生代沉积序列。沉积区的特征是断层传播折叠，逆冲和盐分运动。凹陷处的横断面表明沉积部分的滑移量总计约30 km。天山俯冲带的超推力和反冲力又增加了10至20 km .;前陆变短占整个造山带总数的25％。

著录项

  • 作者

    McKnight, Cleavy Louis.;

  • 作者单位

    Stanford University.;

  • 授予单位 Stanford University.;
  • 学科 Geology.;Remote sensing.
  • 学位 Ph.D.
  • 年度 1993
  • 页码 246 p.
  • 总页数 246
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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