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Chapter 7 Patuki and Croisilles melanges in South Island, New Zealand: genesis related to Permian subduction–accretion processes

Alastair H. F. Robertson
Geological Society, London, Memoirs, 49, 119-156, 2019, https://doi.org/10.1144/M49.10
Alastair H. F. Robertson
School of GeoSciences, University of Edinburgh, Grant Institute, James Hutton Road, Edinburgh EH9 3FE, UK
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Abstract

The late Early Permian (c. 278–270 Ma) supra-subduction zone (SSZ) Dun Mountain ophiolite is bordered to the east by the Pataki Melange and to the NE by the Croisilles Melange. In the south, the ophiolite passes into a dismembered incipient oceanic arc (Otama Complex). The above units represent an oceanic forearc generated above a west-dipping subduction zone. Terrigenous sediment reached the subduction trench after the Mid-Permian(?) docking of the oceanic forearc with the long-lived SE Gondwana active continental margin. Mixed terrigenous–volcaniclastic turbidites accumulated in the trench prior to and during melange accretion. Fragments of the overriding oceanic forearc (and incipient arc, locally) detached and mixed to form melange and broken formation. Despite some individual features (e.g. of the basalt chemistry), the Patuki and Croisilles melanges are interpreted as originally representing a single Permian trench–accretionary complex. The more distal (easterly) part was sliced into the adjacent accretionary complex of the Caples Terrane to form the Croisilles Melange (and equivalent Greenstone Melange) probably after the Triassic. The South Island melanges exemplify accretionary processes in which igneous and sedimentary rocks were detached from the overriding plate by subduction–erosion, together with accretion, including seamount material from the subducting oceanic plate, with implications for melanges elsewhere.

  • © 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 7 Patuki and Croisilles melanges in South Island, New Zealand: genesis related to Permian subduction–accretion processes

Alastair H. F. Robertson
Geological Society, London, Memoirs, 49, 119-156, 2019, https://doi.org/10.1144/M49.10
Alastair H. F. Robertson
School of GeoSciences, University of Edinburgh, Grant Institute, James Hutton Road, Edinburgh EH9 3FE, UK
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Chapter 7 Patuki and Croisilles melanges in South Island, New Zealand: genesis related to Permian subduction–accretion processes

Alastair H. F. Robertson
Geological Society, London, Memoirs, 49, 119-156, 1 May 2019, https://doi.org/10.1144/M49.10
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  • Article
    • Abstract
    • Regional tectonic setting and stratigraphy
    • Patuki Melange
    • Comparison with melange in the Caples Terrane
    • Otama Complex
    • Structural evidence
    • Quantitative petrography
    • Geochemical evidence
    • Discussion: melange genesis and later deformation
    • Conclusions
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