dc.date.accessioned | 2020-12-09T20:06:39Z | |
dc.date.available | 2022-01-09T23:45:40Z | |
dc.date.created | 2020-05-29T12:50:36Z | |
dc.date.issued | 2020 | |
dc.identifier.citation | Elvevold, Synnøve Engvik, Ane Abu-Alam, Tamer Myhre, Per Inge Corfu, Fernando . Prolonged high-grade metamorphism of supracrustal gneisses from Muhlig-Hofmannfjella, central Dronning Maud Land (East Antarctica). Precambrian Research. 2020, 339 | |
dc.identifier.uri | http://hdl.handle.net/10852/81535 | |
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. | |
dc.language | EN | |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 International | |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/4.0/ | |
dc.title | Prolonged high-grade metamorphism of supracrustal gneisses from Muhlig-Hofmannfjella, central Dronning Maud Land (East Antarctica) | |
dc.type | Journal article | |
dc.creator.author | Elvevold, Synnøve | |
dc.creator.author | Engvik, Ane | |
dc.creator.author | Abu-Alam, Tamer | |
dc.creator.author | Myhre, Per Inge | |
dc.creator.author | Corfu, Fernando | |
cristin.unitcode | 185,15,22,50 | |
cristin.unitname | Seksjon for geologi og geofysikk | |
cristin.ispublished | true | |
cristin.fulltext | postprint | |
cristin.qualitycode | 2 | |
dc.identifier.cristin | 1813221 | |
dc.identifier.bibliographiccitation | info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Precambrian Research&rft.volume=339&rft.spage=&rft.date=2020 | |
dc.identifier.jtitle | Precambrian Research | |
dc.identifier.volume | 339 | |
dc.identifier.doi | https://doi.org/10.1016/j.precamres.2020.105618 | |
dc.identifier.urn | URN:NBN:no-84600 | |
dc.type.document | Tidsskriftartikkel | |
dc.type.peerreviewed | Peer reviewed | |
dc.source.issn | 0301-9268 | |
dc.identifier.fulltext | Fulltext https://www.duo.uio.no/bitstream/handle/10852/81535/1/article%2Bnew.pdf | |
dc.type.version | AcceptedVersion | |
cristin.articleid | 105618 | |