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A structural interpretation of the Fish Creek Slide (Lower Cretaceous), northern Alaska

机译:阿拉斯加北部鱼溪滑坡(下白垩统)的结构解释

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摘要

Modern three-dimensional seismic imaging enables a basic geometric description and kinematic interpretation of part of the Fish Creek Slide, a massive (4000 km2; 1500 mi2) slope failure beneath Alaska's North Slope. The Fish Creek Slide is divided into a dominantly extensional organized slide zone in the west and a mostly contractional disorganized slide zone in the east. In the organized slide zone, a series of six organized slide blocks detached from the lower slope along steep escarpments during an inferred Albian earthquake focused at depth on a preexisting southeast-striking fault. Blocks were transported eastward into the basin as failure progressed catastrophically yet systematically by northwestward, en echelon, upslope, footwall collapse. During slide evolution, the primary flat detachment switched from the highly radioactive zone down stratigraphic section to the Lower Cretaceous unconformity. Although the seismic interpretation is hampered by a variety of slide-induced signal problems, several significant, previously unrecognized elements of the Fish Creek Slide are described: shear zones related to displacement variations in the slide, duplex structures in the slide blocks, postslide erosional features, and axial structural lows in slide blocks.
机译:现代的三维地震成像技术可以对小鱼 sup> Creek Slide的一部分进行基本的几何 描述和运动学解释,这是一块巨大的(4000 km 2 ;阿拉斯加北坡 下的1500 mi 2 )边坡破坏。鱼溪滑坡在西部分为 主要为伸展的有组织滑坡区,在东部分为 大部分为收缩无序滑坡区。 在有组织的滑动带,是在推测的阿尔比地震中,深部集中在已存在的 从下坡分离的六个有组织的幻灯片 >东南部断裂。随着破坏性的灾难性发展,大块块被向东输送到盆地,由于西北,梯队,上坡,下盘塌陷而系统性地发生。在 滑坡演化过程中,主要的平面脱离从 高放射性带向下的地层剖面转换为下 白垩纪不整合面。尽管地震解释 受多种滑坡引起的信号问题的阻碍,但仍描述了Fish Creek Slide的几个 重要,以前无法识别的要素:与滑块中的位移变化 ,滑块中的双工结构,后滑块 erosional特征以及滑块中的轴向结构低点有关的剪切区。

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  • 来源
    《AAPG Bulletin》 |2004年第3期|00000265-00000278|共14页
  • 作者

    Thomas X. Homza;

  • 作者单位

    BP Exploration (Alaska) Inc., P.O. Box 196612, 900 East Benson Blvd., Anchorage, Alaska 99519present address: EnCana Oil & Gas (U.S.A.) Inc., 3601 C Street, Suite 1334, Anchorage, Alaska 99503tom.homza@encana.com;

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