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Analysis of enigmatic structures on Mars and Venus and implications for crustal history.

机译：分析火星和金星的神秘结构及其对地壳历史的影响。

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摘要

The crustal history of two structurally complex areas on two different planetary bodies is explored, using a combination of image and topographic analysis, kinematic mapping and numerical modeling. Throughout the polygonal terrain of Utopia Planitia, Mars are found circular grabens that are inferred to overlie the rims of buried impact craters. The correspondence of circular grabens and polygonal terrain suggests that their formation may be intrinsically linked. A topographic analysis of circular grabens shows that they bound topographic depressions whose surface relief scales directly with diameter, consistent with a model of polygon formation dependent upon a "wet" cover material. A model is presented for why the circular grabens are sometimes comprised of two nested ring fractures. The model results imply that cover material in the southwestern polygonal area of Utopia may range from 1--2 km thick and strongly favors a wet sedimentary origin for the cover material. A systematic study of the topography of quasi-circular depressions (QCDs) around the Utopia Basin is presented. The results of this study support the assumption that QCDs are the surface representations of buried impact craters. There are ridges radial to Irnini Mons, Venus, revealed by high resolution mapping at 75 m/pixel. Unlike the unit of arcuate ridges directly south, these ridges are on top of the Irini flows and cannot be an older feature. Analytical modeling of the perturbation of regional stresses around a pressurized magma chamber conduit shows that in the presence of the regional north-south compression, responsible for the regional set of east-west trending wrinkle ridges, circumferential stresses can be compressive. Directional models of Venus' tectonic history argue that all wrinkle ridge formation occurred prior to the formation of large volcanoes. Thus, continuing the regional compression that formed the wrinkle ridges through the volcano building event contradicts directionalism and supports non-directional tectonic models.
机译：通过结合图像和地形分析，运动学制图和数值模型，探索了两个不同行星体上两个结构复杂区域的地壳历史。在整个Utopia Planitia的多边形地形中，火星被发现是圆形的that斗，这些to斗被推断为掩盖了埋藏的撞击坑的边缘。圆形grab片和多边形地形的对应关系表明它们的形成可能存在内在联系。圆形grab爪的地形分析表明，它们约束了地形凹陷，这些凹陷的表面起伏直接与直径成比例，这与依赖于“湿”覆盖材料的多边形形成模型一致。提出了一个模型，说明为什么圆形grab爪有时由两个嵌套的环形裂缝组成。该模型的结果表明，乌托邦西南多边形区域中的覆盖物厚度可能在1--2 km之间，并且强烈倾向于使用湿沉积物作为覆盖物。提出了对乌托邦盆地周围拟圆形凹陷（QCDs）地形的系统研究。这项研究的结果支持以下假设：QCD是掩埋撞击坑的表面表示。通过75 m /像素的高分辨率贴图揭示了金星Irnini Mons径向的山脊。与正南的弧形山脊单元不同，这些山脊位于Irini流的顶部，不能作为较旧的特征。加压岩浆腔导管周围区域应力微扰的分析模型表明，在存在南北向压缩的情况下，周向应力可能是压缩的，南北向压缩作用是东西向趋势褶皱脊的区域集。金星的构造历史方向模型认为，所有皱纹脊的形成都发生在大型火山形成之前。因此，继续通过火山形成事件形成褶皱脊的区域压缩与方向性相矛盾，并支持非方向性构造模型。

著录项

  • 作者

    Buczkowski, Debra L.;

  • 作者单位

    University of Massachusetts Amherst.;

  • 授予单位 University of Massachusetts Amherst.;
  • 学科 Geology.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 102 p.
  • 总页数 102
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;
  • 关键词

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