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Mesoarchean partial melting of mafic crust and tonalite production during high-T–low-P stagnant tectonism, Akia Terrane, West Greenland

Research output: Contribution to journalArticle

Author(s)

C. Yakymchuk, C.L. Kirkland, J.A. Hollis, J. Kendrick, N. J. Gardiner, K. Szilas

School/Research organisations

Abstract

Different geodynamic models exist for the growth and differentiation of Archean continental crust, ranging from horizontal tectonics with subduction zones to vertical tectonics with foundering of greenstone sequences. U–Pb zircon geochronology, field relationships, and pressure–temperature constraints from granulite-facies metabasite of the Akia Terrane of the North Atlantic Craton in West Greenland show that this terrane grew through two major magmatic growth episodes: an earlier one at c. 3.2 Ga, and a later one at c. 3.05–2.97 Ga. Phase equilibrium modelling for assemblages related to the latter indicates temperatures of >800°C at 0.8 GPa in the stability field of garnet. U–Pb zircon geochronology and existing Hf isotope data are also consistent with a model involving protracted Mesoarchean magmatic growth with limited mantle addition during a prolonged period of high temperatures in a relatively stagnant tectonic regime prior to Neoarchean compressional tectonism in the Akia Terrane.
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Details

Original languageEnglish
Article number105615
JournalPrecambrian Research
Volume339
Early online date8 Jan 2020
DOIs
Publication statusE-pub ahead of print - 8 Jan 2020

    Research areas

  • Zircon, North Atlantic Craton, Granulite, Pseudosection, Partial melting

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