| Autor: |
Ramírez-Salazar, A, Müller, T, Piazolo, S, Webb, AAG, Hauzenberger, C, Zuo, J, Haproff, P, Harvey, J, Wong, TK, Charlton, C |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| ISSN: |
0278-7407 |
| Popis: |
The Eoarchean Isua supracrustal belt (ISB) has been interpreted as one of the earliest records of subduction processes, leading to the conclusion that a plate tectonic geodynamic system was likely operating since the early Archean. However, proposed tectonic models remain difficult to evaluate as our understanding of the metamorphic and structural evolution remains fragmentary. Here, we present a metamorphic study of the supracrustal rocks of the ISB. We used petrographic and microstructural observations, phase equilibria, isopleth geothermobarometry, and conventional thermometry to explore the prograde, peak, and retrograde metamorphic evolution of the northeastern ISB. Our results show that the ISB records a syn‐tectonic, amphibolite facies metamorphic event (M1) with peak conditions of 550°C–600°C and 0.5–0.7 GPa. M1 was followed by a static, lower amphibolite facies metamorphic event (M2; 3.5 Ga) and the Neoarchean ( |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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