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Eoarchean contrasting ultra-high-pressure to low-pressure metamorphisms (< 250 to > 1000 degrees C/GPa) explained by tectonic plate convergence in deep time

Nutman, Allen P.; Bennett, Vickie; Friend, C. R. L.; Yi, Keewook


Greenland’s Itsaq Gneiss Complex (IGC) shows Eoarchean (> 3600 Ma) 250–400 °C/GPa (low T/P – high pressure) and ≥1000 °C/GPa (high T/P) metamorphic regimes, demonstrating a similarity of contrasting metamorphic T/P regimes from the Phanerozoic back to the start of Earth’s rock record. Low T/P metamorphism produced: (i) Deep crustal eclogitised mafic rocks which upon partial melting formed the tonalites dominating the IGC; (ii) ~550 °C ≥ 2.6 GPa conditions (≤250 °C/GPa) demonstrated by an...[Show more]

CollectionsANU Research Publications
Date published: 2020-07-15
Type: Journal article
Source: Precambrian Research
DOI: 10.1016/j.precamres.2020.105770
Access Rights: Open Access


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