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Trans-crustal structural control of CO2-rich extensional magmatic systems revealed at Mount Erebus Antarctica

Author

Listed:
  • G. J. Hill

    (University of Canterbury, Gateway Antarctica
    Czech Academy of Science)

  • P. E. Wannamaker

    (University of Utah, Energy & Geoscience Institute)

  • V. Maris

    (University of Utah, Energy & Geoscience Institute)

  • J. A. Stodt

    (Numeric Resources LLC)

  • M. Kordy

    (University of Utah, Energy & Geoscience Institute)

  • M. J. Unsworth

    (University of Alberta, Department of Physics)

  • P. A. Bedrosian

    (United States Geological Survey)

  • E. L. Wallin

    (University of Hawaii at Manoa, Hawaii Institute of Geophysics and Planetology)

  • D. F. Uhlmann

    (First Light Mountain Guides
    University of Lausanne, Department of Earth Science)

  • Y. Ogawa

    (Tokyo Institute of Technology, Volcanic Fluid Research Centre)

  • P. Kyle

    (New Mexico Institute of Mining and Technology)

Abstract

Erebus volcano, Antarctica, with its persistent phonolite lava lake, is a classic example of an evolved, CO2-rich rift volcano. Seismic studies provide limited images of the magmatic system. Here we show using magnetotelluric data that a steep, melt-related conduit of low electrical resistivity originating in the upper mantle undergoes pronounced lateral re-orientation in the deep crust before reaching shallower magmatic storage and the summit lava lake. The lateral turn represents a structural fault-valve controlling episodic flow of magma and CO2 vapour, which replenish and heat the high level phonolite differentiation zone. This magmatic valve lies within an inferred, east-west structural trend forming part of an accommodation zone across the southern termination of the Terror Rift, providing a dilatant magma pathway. Unlike H2O-rich subduction arc volcanoes, CO2-dominated Erebus geophysically shows continuous magmatic structure to shallow crustal depths of

Suggested Citation

  • G. J. Hill & P. E. Wannamaker & V. Maris & J. A. Stodt & M. Kordy & M. J. Unsworth & P. A. Bedrosian & E. L. Wallin & D. F. Uhlmann & Y. Ogawa & P. Kyle, 2022. "Trans-crustal structural control of CO2-rich extensional magmatic systems revealed at Mount Erebus Antarctica," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-30627-7
    DOI: 10.1038/s41467-022-30627-7
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    References listed on IDEAS

    as
    1. Philip E. Wannamaker & T. Grant Caldwell & George R. Jiracek & Virginie Maris & Graham J. Hill & Yasuo Ogawa & Hugh M. Bibby & Stewart L. Bennie & Wiebke Heise, 2009. "Fluid and deformation regime of an advancing subduction system at Marlborough, New Zealand," Nature, Nature, vol. 460(7256), pages 733-736, August.
    2. Phil Wannamaker & Graham Hill & John Stodt & Virginie Maris & Yasuo Ogawa & Kate Selway & Goran Boren & Edward Bertrand & Daniel Uhlmann & Bridget Ayling & A. Marie Green & Daniel Feucht, 2017. "Uplift of the central transantarctic mountains," Nature Communications, Nature, vol. 8(1), pages 1-11, December.
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