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Magnetic fabric of Late Jurassic arc plutons and kinematics of terrane accretion in the Blue Mountains, northeastern Oregon

Result description

The Blue Mountains Province of northeastern Oregon, western Idaho, and southeastern Washington (USA) consists of the amalgamated Wallowa distal island arc, Baker melange-bearing accretionary wedge-forearc, and Olds Ferry fringing island arc terranes. Anisotropy of magnetic susceptibility (AMS) and particularly the orientation of magnetic lineations in Middle to Late Jurassic diorite-tonalite-granodiorite plutons intruding the Baker terrane indicate a change in tectonic regime from flattening with principal stretching at a high angle to the local orientation of the terrane boundaries at around 160 Ma to constriction with boundary-subparallel subhorizontal stretching at ca. 146 Ma. The former magnetic fabric is compatible with magnetic lineations recording strain related to top-to-the-southwest back-thrusting onto the Olds Ferry arc. In contrast, the similar to 146 Ma boundary-parallel stretching may record strain partitioning whereby a part of the Baker terrane was extruded laterally pa

Keywords

terrane accretionNorth American cratonBlue Mountains ProvinceBaker terraneAnisotropy of magnetic susceptibility (AMS)

The result's identifiers

Alternative languages

  • Result language

    angličtina

  • Original language name

    Magnetic fabric of Late Jurassic arc plutons and kinematics of terrane accretion in the Blue Mountains, northeastern Oregon

  • Original language description

    The Blue Mountains Province of northeastern Oregon, western Idaho, and southeastern Washington (USA) consists of the amalgamated Wallowa distal island arc, Baker melange-bearing accretionary wedge-forearc, and Olds Ferry fringing island arc terranes. Anisotropy of magnetic susceptibility (AMS) and particularly the orientation of magnetic lineations in Middle to Late Jurassic diorite-tonalite-granodiorite plutons intruding the Baker terrane indicate a change in tectonic regime from flattening with principal stretching at a high angle to the local orientation of the terrane boundaries at around 160 Ma to constriction with boundary-subparallel subhorizontal stretching at ca. 146 Ma. The former magnetic fabric is compatible with magnetic lineations recording strain related to top-to-the-southwest back-thrusting onto the Olds Ferry arc. In contrast, the similar to 146 Ma boundary-parallel stretching may record strain partitioning whereby a part of the Baker terrane was extruded laterally pa

  • Czech name

  • Czech description

Classification

  • Type

    Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    DB - Geology and mineralogy

  • OECD FORD branch

Result continuities

Others

  • Publication year

    2012

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Gondwana Research

  • ISSN

    1342-937X

  • e-ISSN

  • Volume of the periodical

    22

  • Issue of the periodical within the volume

    1

  • Country of publishing house

    JP - JAPAN

  • Number of pages

    12

  • Pages from-to

    341-352

  • UT code for WoS article

    000305106800026

  • EID of the result in the Scopus database