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首页> 外文学位 >Nature and growth of nonmarine-to-marine clastic wedges: Examples from the Upper Cretaceous Iles Formation, Western Interior (Colorado) and the lower paleogene Wilcox Group of the Gulf of Mexico Basin (Texas).
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Nature and growth of nonmarine-to-marine clastic wedges: Examples from the Upper Cretaceous Iles Formation, Western Interior (Colorado) and the lower paleogene Wilcox Group of the Gulf of Mexico Basin (Texas).

机译：非海洋到海洋碎屑楔的性质和生长：来自墨西哥湾盆地（得克萨斯州）的上白垩统Iles组，西部内陆（科罗拉多州）和下古相Wilcox组的例子。

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摘要

Sequential stratigraphic analyses of third-order, nonmarine-to-marine; clastic wedges provide insights on their growth. Examples studied are the Campanian, Iles Formation, Western Interior Basin (a foreland basin); and the upper Paleocene-lower Eocene Wilcox Group, northwest Gulf of Mexico Basin (a passive-margin basin). In the Iles Formation, the geometry and architecture of fourth-order (0.08–0.5 m.y.) marine-sandstone tongues appear to have a relationship to third-order (0.5–5.0 m.y.) shoreline trajectory. These relationships include a positive correlation between low angles of third-order shoreline trajectory, increasing sandstone-tongue length, and the presence of sharp-based shoreface sandstones, incised valley fills, and gutter casts.; The Iles wedge of the Sand Wash Basin displays a regressive-transgressive pattern of shoreline trajectory that spans 3.3 m.y. It is proposed that this third-order sedimentary cycle can be recognized across the region of northwest Colorado and southern Wyoming. The Campanian of the southern Wyoming/northern Colorado sector of the WIB contains four, large-scale third-order clastic-wedge intervals, or sequences (2.8–3.5 m.y.). These clastic wedges can be identified based on a combination of shoreline trajectory and the presence of regional erosion-surfaces created by relative falls in sea level. Inferred climatic warming coincides with transgressive bases of three Campanian wedges (wedges 1, 2, and 4).; In the Wilcox Group of Texas, four clastic-wedges have recurrence intervals ranging from 2.5–3.3 m.y. It is proposed that clastic wedges with recurrence intervals of 2.5–3.5 m.y. represent a commonly recurring scale of sedimentary sequence. Published accounts of recurring, abrupt warming events (interregional to global in scale) show a close correspondence in timing with the transgressive maxima defining boundaries of the four Wilcox clastic wedges.; Cross-cutting relationships of thrust-faults at the margin of the greater Green River Basin (Laramide foreland of Wyoming) show evidence of thrust motion that corresponds to strong regression to early transgression in the Wilcox Group (Texas Gulf of Mexico Basin). Motion on these faults ceased at times equivalent to the transgressions bounding Wilcox clastic wedges. This relationship provides evidence to suggest that deformational episodes in the thrust belt and greater broken-foreland correspond to episodes of increased generation of sediment that fed continental-scale rivers and associated delta complexes at the passive margin.
机译：三阶非海洋对海洋的顺序地层分析；碎屑楔形物提供了有关其生长的见解。所研究的例子是坎帕尼亚，伊尔斯组，西部内陆盆地（前陆盆地）；以及墨西哥湾西北缘盆地（被动边缘盆地）的上新世-下新世Wilcox组。在Iles组中，四阶（0.08-0.5 m.y.）海砂岩舌的几何形状和结构似乎与三阶（0.5-5.0 m.y.）海岸线轨迹有关系。这些关系包括三阶海岸线轨迹的低角度，增加的砂岩舌长度，以及锋利的岸基砂岩，切开的河谷填充物和天沟铸件之间的正相关。沙洲盆地的Iles楔形显示了跨越3.3 m.y的海岸线轨迹的渐进-渐进模式。建议可以在科罗拉多州西北部和怀俄明州南部地区识别这种三次沉积循环。 WIB的怀俄明州南部/科罗拉多北部地区的Campanian包含四个大型三阶碎屑楔间隔或层序（2.8-3.5 m.y.）。可以基于海岸线轨迹和由相对海平面下降产生的区域侵蚀面的组合来识别这些碎屑楔。推测的气候变暖与三个坎帕尼楔的海侵基部（楔1、2和4）相吻合。在得克萨斯州的威尔科克斯集团中，四个碎屑楔的复发间隔为2.5-3.3m.y。建议使用复发间隔为2.5-3.5 m.y的碎屑楔。代表沉积序列的通常重复尺度。周期性的，突然的变暖事件（从区域间到全球范围内）的已发表的报告显示，在时间上与限定四个威尔科克斯碎屑楔形边界的海侵最大值密切相关。更大的绿河盆地（怀俄明州的拉拉蒙德前陆）边缘的冲断断层的横切关系表明，在威尔科克斯群（德克萨斯州墨西哥湾盆地）中，冲断运动与早期海侵的强烈回归相对应。在这些断层上的运动有时会停止，这相当于限制威尔科克斯碎屑楔形的海侵。这种关系提供了证据，表明逆冲带中的变形事件和更大的前陆断层对应于在被动边缘向大陆规模的河流和相关三角洲联合体输送的沉积物生成增加的事件。

著录项

  • 作者

    Crabaugh, Jeff Patrick.;

  • 作者单位

    University of Wyoming.;

  • 授予单位 University of Wyoming.;
  • 学科 Geology.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 235 p.
  • 总页数 235
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;
  • 关键词

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