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首页> 外文期刊>GSA Bulletin >Relay-ramp forms and normal-fault linkages, Canyonlands National Park, Utah
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Relay-ramp forms and normal-fault linkages, Canyonlands National Park, Utah

机译：犹他州峡谷地国家公园的中继坡道形式和正常故障联系

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摘要

Fieldwork within a series of mesoscale grabens in southeast Utah has revealed a particularly well-exposed system of interlinked extensional faults. A series of down-faulted grabens are developed within a 460-m-thick brittle layer of upper Paleozoic sandstone and shale, which overlies a ductile layer with a high gypsum content. All the major grabens consist of two or more overlapping elements, which are composed of fault segments. These segments may be hard-linked (fault surfaces are joined) or soft-linked (fault surfaces are isolated, but linked by ductile strain of the rock volume between them) in map view. Relay structures are defined as zones connecting the footwalls and hanging walls of overlapping fault segments representing soft linkage of fault segments. In the Canyonlands grabens, the transfer of displacement between soft-linked fault segments is characterized by well-de-fined, dipping relay ramps, commonly rotated and extended to accommodate the ductile strain between the overlapping fault segments. Relay ramps develop as ephemeral structures, eventually becoming breached by hard linkage of the fault segments. Breakdown of ramps by breaching is part of the process of fault growth by segment linkage. Within the Canyonlands graben system, four orders of segmentation are present. This may be a consequence of different scales of mechanical heterogeneity, but evidence from the Canyonlands grabens and elsewhere points to a fundamental process of discontinuous fault growth by segment linkage.
机译：在犹他州东南部的一系列中尺度地grab中的野外作业揭示了一个特别暴露良好的相互关联的 延伸性断层系统。在上古生界砂岩 和页岩的460 m厚的脆性层中，开发了一系列断层抓斗 ，该页岩覆盖着高石膏 内容。所有主要抓斗都由两个或更多个重叠的 元素组成，这些元素由断层段组成。这些段 可以是硬链接的（连接断层表面），也可以是软链接的 （断层表面是隔离的，但通过 的延性应变链接在地图视图中）。中继结构 定义为连接重叠的断层段的下盘和下盘的区域，表示断层段的软连接。在峡谷地抓斗中，软链接断层段之间的位移 的传递的特征是定义明确的， 浸入式继电器坡道，通常会旋转并延伸以适应 重叠断层段之间的延性应变。 Relay 坡道发展为短暂的结构，最终通过断层段的硬连接而被破坏。通过 破坏对斜坡的破坏是通过段 链接进行的故障增长过程的一部分。在Canyonlands抓取系统中，存在四个 分段命令。这可能是不同程度的机械异质性的结果，但是Canyonlands grabens和其他地方的证据表明， 断层生长不连续的基本过程通过段链接。

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  • 来源
    《GSA Bulletin》 |1994年第9期|1143-1157|共15页
  • 作者

    BRUCE TRUDGILL; JOSEPH CARTWRIGHT;

  • 作者单位

    Department of Geology Royal School of Mines Imperial College, London SW7 2BP United Kingdom;

    Department of Geology Royal School of Mines Imperial College, London SW7 2BP United Kingdom;

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