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Fluid and deformation regime of an advancing subduction system at Marlborough, New Zealand

Author

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  • Philip E. Wannamaker

    (University of Utah, Energy and Geoscience Institute, 423 Wakara Way, Suite 300, Salt Lake City, Utah 84108, USA)

  • T. Grant Caldwell

    (GNS Science, P O Box 30368, Lower Hutt, 6315 Wellington, New Zealand)

  • George R. Jiracek

    (San Diego State University, 5300 Campanile Drive, San Diego, California 92182, USA)

  • Virginie Maris

    (283 Sutton Building, University Of Utah)

  • Graham J. Hill

    (GNS Science, P O Box 30368, Lower Hutt, 6315 Wellington, New Zealand)

  • Yasuo Ogawa

    (Tokyo Institute of Technology, Volcanic Fluid Research Center, H84, 2-12-1 Ookayama, Meguro, Tokyo, 152-8551, Japan)

  • Hugh M. Bibby

    (GNS Science, P O Box 30368, Lower Hutt, 6315 Wellington, New Zealand)

  • Stewart L. Bennie

    (GNS Science, P O Box 30368, Lower Hutt, 6315 Wellington, New Zealand)

  • Wiebke Heise

    (GNS Science, P O Box 30368, Lower Hutt, 6315 Wellington, New Zealand)

Abstract

Fault evolution The study of newly forming subduction zones can provide insights into the evolution of major fault zone geometries from shallow levels to deep in Earth's lithosphere, and into the role of fluids in promoting rock failure by several modes. Here Wannamaker et al. present a transect of magnetotelluric soundings from across the Marlborough strike-slip fault system in New Zealand. Their data suggest that massive fluid release just inland of the trench induces fault-fracture meshes through the crust above that weaken it as regional shear initiates. Narrow strike–slip faults in the shallow brittle regime of interior Marlborough diffuse in width upon entering the deeper ductile domain aided by fluids and do not project as narrow deformation zones. Deep subduction-generated fluids rise from 100 km or more and invade upper crustal seismogenic zones that have exhibited historic great earthquakes on high-angle thrusts that are poorly oriented for failure under dry conditions.

Suggested Citation

  • 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.
    • Handle: RePEc:nat:nature:v:460:y:2009:i:7256:d:10.1038_nature08204
    DOI: 10.1038/nature08204
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    Cited by:

    1. 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.

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