dc.contributor.author | Elvevold, Synnøve | |
dc.contributor.author | Engvik, Ane | |
dc.contributor.author | Abu-Alam, Tamer | |
dc.contributor.author | Myhre, Per Inge | |
dc.contributor.author | Corfu, Fernando | |
dc.date.accessioned | 2020-12-04T08:54:49Z | |
dc.date.available | 2020-12-04T08:54:49Z | |
dc.date.issued | 2020-01-09 | |
dc.description.abstract | The bedrock of Mühlig-Hofmannfjella, central Dronning Maud Land in eastern Antarctica, is part of the high-grade Maud Belt and comprises a deep-seated metamorphic-plutonic complex. The P-T-t evolution of anatectic supracrustal gneisses has been recovered through a study of mineral assemblages, textural relationships and U-Pb ID TIMS geochronology on zircon and monazite followed by pseudosection modelling. Peak conditions reached granulite facies conditions (T ≥ 810–820 °C) at moderate crustal depths (P = ca. 8 kbar) and resulted in partial melting. Peak-pressure conditions were followed by isothermal decompression at elevated temperatures. After exhumation to crustal levels of about 4–5 kbar, the area underwent a final near-isobaric cooling, which is documented by a secondary growth of garnet. Zircons indicate a period of growth at 570–566 Ma, whereas monazite ages range from 610 to 525 Ma. A likely heat source for the granulite facies metamorphism is decay of radioactive heat-producing elements in the core of the orogen. The combined geochronology and metamorphic data indicate a prolonged, clockwise P-T path, which reflects collision and formation of a long-lived orogenic plateau. | en_US |
dc.description | Accepted manuscript version, licensed <a href=http://creativecommons.org/licenses/by-nc-nd/4.0/> CC BY-NC-ND 4.0. </a> | en_US |
dc.identifier.citation | Elvevold S, Engvik A, Abu-Alam T, Myhre PI, Corfu F. Prolonged high-grade metamorphism of supracrustal gneisses from Muhlig-Hofmannfjella, central Dronning Maud Land (East Antarctica). Precambrian Research. 2020;339 | en_US |
dc.identifier.cristinID | FRIDAID 1813221 | |
dc.identifier.doi | 10.1016/j.precamres.2020.105618 | |
dc.identifier.issn | 0301-9268 | |
dc.identifier.issn | 1872-7433 | |
dc.identifier.uri | https://hdl.handle.net/10037/19983 | |
dc.language.iso | eng | en_US |
dc.publisher | Elsevier | en_US |
dc.relation.journal | Precambrian Research | |
dc.rights.accessRights | openAccess | en_US |
dc.rights.holder | © 2020 Elsevier B.V. All rights reserved. | en_US |
dc.subject | VDP::Mathematics and natural science: 400::Geosciences: 450 | en_US |
dc.subject | VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 | en_US |
dc.title | Prolonged high-grade metamorphism of supracrustal gneisses from Muhlig-Hofmannfjella, central Dronning Maud Land (East Antarctica) | en_US |
dc.type.version | acceptedVersion | en_US |
dc.type | Journal article | en_US |
dc.type | Tidsskriftartikkel | en_US |
dc.type | Peer reviewed | en_US |