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Chapter 6 Coupled deformation and melt-migration events recording subduction initiation, Dun Mountain ophiolite, New Zealand

E. Stewart, J. Newman, B. Tikoff, S. Donnelly, L. German, View ORCID ProfileV. Chatzaras, View ORCID ProfileW. M. Lamb, B. Miller and View ORCID ProfileS. C. Kruckenberg
Geological Society, London, Memoirs, 49, 93-117, 1 May 2019, https://doi.org/10.1144/M49.5
E. Stewart
1Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, USA
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J. Newman
1Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, USA
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B. Tikoff
2Department of Geoscience, University of Wisconsin – Madison, Madison, WI 53706, USA
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  • For correspondence: basil@geology.wisc.edu
S. Donnelly
1Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, USA
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L. German
1Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, USA
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V. Chatzaras
3School of Geosciences, The University of Sydney, Sydney, NSW 2006, Australia
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  • ORCID record for V. Chatzaras
W. M. Lamb
1Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, USA
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  • ORCID record for W. M. Lamb
B. Miller
1Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, USA
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S. C. Kruckenberg
4Department of Earth and Environmental Sciences, Boston College, Chestnut Hill, MA 02467, USA
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Abstract

The Dun Mountain ophiolite, South Island, New Zealand, records complex overprinting of mantle fabrics. Using structural observations, microstructural analysis, geothermometry, geobarometry, geochronology and rheological constraints from the Red Hills and Dun Mountain massifs, we propose that three deformation events occurred during the early stages of subduction initiation along the Permian margin of Gondwana. During the first deformation event, the lineated Two Tarns Harzburgite from the Red Hills formed in a transtensional setting associated with subduction initiation. Deformation was pervasive, homogeneous and simultaneous with boninitic melt migration through the unit; it also occurred at very fast strain rates (10−9–10−8 s−1). During the second deformation event, progressive exhumation to c. 5 kbar and cooling to 1000°C led to the localization of melt and deformation into distinct zones (Dun Mountain, and the Plateau Complex, Plagioclase Zone and Ellis Stream Complex of the Red Hills). The third deformation event resulted in continued cooling and exhumation along serpentinized faults. This history provides a rare glimpse of the coupled fabric development and melt migration that sequentially develop in the early mantle wedge during the initiation of a subduction zone.

  • © 2019 The Author(s). Published by The Geological Society of London. All rights reserved
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Geological Society, London, Memoirs: 49 (1)
Geological Society, London, Memoirs
Volume 49
2019
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Chapter 6 Coupled deformation and melt-migration events recording subduction initiation, Dun Mountain ophiolite, New Zealand

E. Stewart, J. Newman, B. Tikoff, S. Donnelly, L. German, V. Chatzaras, W. M. Lamb, B. Miller and S. C. Kruckenberg
Geological Society, London, Memoirs, 49, 93-117, 1 May 2019, https://doi.org/10.1144/M49.5
E. Stewart
1Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, USA
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
J. Newman
1Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, USA
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
B. Tikoff
2Department of Geoscience, University of Wisconsin – Madison, Madison, WI 53706, USA
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: basil@geology.wisc.edu
S. Donnelly
1Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, USA
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L. German
1Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, USA
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V. Chatzaras
3School of Geosciences, The University of Sydney, Sydney, NSW 2006, Australia
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  • Search for this author on this site
  • ORCID record for V. Chatzaras
W. M. Lamb
1Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, USA
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  • Search for this author on this site
  • ORCID record for W. M. Lamb
B. Miller
1Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, USA
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S. C. Kruckenberg
4Department of Earth and Environmental Sciences, Boston College, Chestnut Hill, MA 02467, USA
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  • ORCID record for S. C. Kruckenberg

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Chapter 6 Coupled deformation and melt-migration events recording subduction initiation, Dun Mountain ophiolite, New Zealand

E. Stewart, J. Newman, B. Tikoff, S. Donnelly, L. German, V. Chatzaras, W. M. Lamb, B. Miller and S. C. Kruckenberg
Geological Society, London, Memoirs, 49, 93-117, 1 May 2019, https://doi.org/10.1144/M49.5
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  • Article
    • Abstract
    • Geological background: Dun Mountain ophiolite (DMO)
    • Red Hills ultramafic massif
    • Compositional units and fabrics
    • Microstructures and crystallographic preferred orientation (CPO)
    • Geothermobarometry
    • Rheological estimates
    • Geochronology methods and results
    • Dun Mountain ultramafic massif
    • Composition and fabrics
    • Microstructures and crystallographic preferred orientation (CPO)
    • Geothermobarometry
    • Rheological estimates
    • Discussion
    • Conclusions
    • Acknowledgements
    • Appendix A: Geothermometry and geobarometry methods
    • References
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