Structural and tectonothermal evolution of the ultrahigh-temperature Bakhuis Granulite Belt, Guiana Shield, Surinam: Palaeoproterozoic to Recent
| Autor: | Fraukje M. Brouwer, F.F. Beunk, Keewook Yi, Emond W.F. de Roever |
|---|---|
| Přispěvatelé: | Geology and Geochemistry |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
010504 meteorology & atmospheric sciences
Metamorphic rock Geochemistry Metamorphism 010502 geochemistry & geophysics 01 natural sciences Passive margin Bakhuis granulite belt Bakhuis Granulite Belt Guiana Shield Transamazonian orogeny UHT metamorphism tectonics P-T-t evolution SDG 14 - Life Below Water 0105 earth and related environmental sciences Subduction Tectonics lcsh:QE1-996.5 Orogeny Granulite lcsh:Geology Birimian Guiana shield General Earth and Planetary Sciences Geology Zircon |
| Zdroj: | Geoscience Frontiers, Vol 12, Iss 2, Pp 677-692 (2021) Beunk, F, de Roever, E, Yi, K & Brouwer, F M 2021, ' Structural and tectonothermal evolution of the ultrahigh-temperature Bakhuis Granulite Belt, Guiana Shield, Surinam: Palaeoproterozoic to Recent ', Geoscience Frontiers, vol. 12, no. 2, pp. 677-692 . https://doi.org/10.1016/j.gsf.2020.05.021 Geoscience Frontiers, 12(2), 677-692. China University of Geosciences (Beijing) and Peking University |
| ISSN: | 1674-9871 |
| DOI: | 10.1016/j.gsf.2020.05.021 |
| Popis: | We constrain the multistage tectonic evolution of the Palaeoproterozoic UHT metamorphic (P = 0.9–1.0 GPa, T >1000 °C, t = 2088–2031 Ma) Bakhuis Granulite Belt (BGB) in Surinam on the Guiana Shield, using large- to small-scale structures, Al-in-hornblende thermobarometry and published fluid inclusion and zircon geochronological data. The BGB forms a narrow, NE–SW striking belt between two formerly connected, ~E–W oriented granite-greenstone belts, formed between converging Amazonian and West African continental masses prior to collision and Transamazonian orogeny. Inherited detrital zircon in BGB metasediments conforms agewise to Birimian zircon of West Africa and suggests derivation from the subsequently subducted African passive margin. Ultrahigh-temperature metamorphism may have followed slab break-off and asthenospheric heat advection. Peak metamorphic structures result from layer-parallel shearing and folding, reflecting initial transtensional exhumation of the subducted African margin after slab break-off. A second HT event involves intrusion, at ca. 0.49 GPa, of charnockites and metagabbros at 1993–1984 Ma and a layered anorthosite at 1980 Ma, after the BGB had already cooled to |
| Databáze: | OpenAIRE |
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