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    The Nucleation and Evolution of Riedel Shear Zones as Deformation Bands in Porous Sandstone

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    azu_td_geo_0010_sip1_w.pdf
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    Description:
    Master's Thesis Full PDF
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    Author
    Ahlgren, Stephen G.
    Issue Date
    1999
    Keywords
    Capitol Reef National Park
    clastic rocks
    Colorado Plateau
    compaction
    deformation
    faults
    folds
    Jurassic
    Mesozoic
    Navajo Sandstone
    porosity
    porous materials
    Riedel shear zones
    sandstone
    sedimentary rocks
    shear zones
    southern Utah
    strike-slip faults
    tectonics
    United States
    Utah
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    Advisor
    Davis, George H.
    Committee Chair
    Davis, George H.
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the Antevs Library, Department of Geosciences, and the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author or the department.
    Collection Information
    This item is part of the Geosciences Theses collection. It was digitized from a physical copy provided by the Antevs Library, Department of Geosciences, University of Arizona. For more information about items in this collection, please email the Antevs Library, antevs@geo.arizona.edu.
    Abstract
    Riedel shear zones are geometric fault patterns commonly associated with strike-slip fault systems. The progressive evolution of natural Riedel shear zones within the Navajo Sandstone of southern Utah is interpreted from the spatial evolution of small-scale, incipient Proto-Riedel Zones (PRZs) to better-developed Riedel shear zones using field mapping and three-dimensional digital modeling. PRZs nucleate as a tabular zone of localized shearing marked by en èchelon deformation bands, each of which is no more than a few mm wide and tens of cm long, and oriented at 55° - 85° to the trend of the zone. With increasing strain, deformation bands and sedimentary markers are sheared ductily through granular flow and assume a sigmoidal form. The temporal and spatial evolution of bands comprising a Riedel shear zone suggests that PRZs nucleate as transitional-compactional deformation bands under localized, supra-lithostatic fluid pressure. Subsequent bands develop under modified regional stresses as conjugate shear fractures within the strain- hardened axis of the PRZ. These antithetic driven systems are not compatible with traditional synthetic driven models of Riedel shear zones. Unlike most synthetic driven examples, these antithetic driven systems are not controlled by preexisting "basement" structures, thus their geometries reflect a primary propagation or secondary passive deformation mechanism.
    Type
    text
    Thesis-Reproduction (electronic)
    Degree Name
    M.S.
    Degree Level
    masters
    Degree Program
    Graduate College
    Geosciences
    Degree Grantor
    University of Arizona
    Collections
    Geosciences Theses

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