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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian

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Volume 104, Issue 1


Inefficient high-temperature metamorphism in orthogneiss

Timothy Chapman / Geoffrey L. Clarke
  • School of Geosciences, The University of Sydney, New South Wales 2006, New South Wales Australia
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Sandra Piazolo
  • ARC Centre of Excellence for Core to Crust Fluid Systems and GEMOC, Department of Earth and Planetary Sciences, Macquarie University, New South Wales 2109, New South Wales Australia
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Nathan R. Daczko
  • ARC Centre of Excellence for Core to Crust Fluid Systems and GEMOC, Department of Earth and Planetary Sciences, Macquarie University, New South Wales 2109, New South Wales Australia
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2019-01-02 | DOI: https://doi.org/10.2138/am-2019-6503


A novel method utilizing crystallographic orientation and mineral chemistry data, based on large-scale electron backscatter diffraction (EBSD) and microbeam analysis, quantifies the proportion of relict igneous and neoblastic minerals forming variably deformed high-grade orthogneiss. The Cretaceous orthogneiss from Fiordland, New Zealand, comprises intermediate omphacite granulite interlayered with basic eclogite, which was metamorphosed and deformed at T ≈ 850 °C and P ≈ 1.8 GPa after protolith cooling. Detailed mapping of microstructural and physiochemical relations in two strain profiles through subtly distinct intermediate protoliths indicates that up to 32% of the orthogneiss mineralogy is igneous, with the remainder being metamorphic. Domains dominated by igneous minerals occur preferentially in strain shadows to eclogite pods. Distinct metamorphic stages can be identified by texture and chemistry and were at least partially controlled by strain magnitude. At the grain-scale, the coupling of metamorphism and crystal plastic deformation appears to have permitted efficient transformation of an originally igneous assemblage. The effective distinction between igneous and metamorphic paragenesis and their links to deformation history enables greater clarity in interpretations of the makeup of the crust and their causal influence on lithospheric scale processes.

Keywords: Neoblasts; EBSD; recrystallization; strain; tectonometamorphism; microstructure; Understanding of Reaction and Deformation Microstructures

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About the article

Current address: School of Earth and Environment, University of Leeds, U.K.

‡ Special collection papers can be found online at http://www.minsocam.org/MSA/AmMin/special-collections.html

Received: 2018-02-08

Accepted: 2018-10-01

Published Online: 2019-01-02

Published in Print: 2019-01-28

Citation Information: American Mineralogist, Volume 104, Issue 1, Pages 17–30, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2019-6503.

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