The Fosdick granite-migmatite complex, West Antarctica: Evaluation as a feeder zone of silicic magmas

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Bibliographic Information

Other Title
  • 西南極フォスディック花崗岩ミグマタイト複合岩体：珪長質マグマフィーダー帯としての評価

Abstract

The Fosdick Mountains of Marie Byrd Land, West Antarctica host subordinate migmatitic gneisses corresponding to the middle-to-lower crust (∼6-10 Kbar) and dominant granites. Based on petrography and geochemistry the granites are divided into silimanite-bearing low-Sr and silimanite-free high-Sr types. U-Pb geochronology on magmatic zircon from the granites reveals two periods of emplacement during Carboniferous and Cretaceous, consistent with a polyorogenic evolution of the region during Devonian-Carboniferous continental arc activity and Cretaceous continental rifting. The Cretaceous high-Sr granites, with U-Pb zircon ages and Sr-Nd isotope compositions comparable to the Cretaceous Byrd Coast Granite suite, are interpreted as a feeder zone for the shallow-level intrusions.

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Details 詳細情報について

  • CRID
    1390001205545696896
  • NII Article ID
    130005008276
  • DOI
    10.14824/jakoka.2008.0.35.0
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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