dc.contributor.author | Grenne, Tor | |
dc.contributor.author | Gasser, Deta | |
dc.contributor.author | Bøe, Reidulv | |
dc.contributor.author | Corfu, Fernando | |
dc.contributor.author | Skår, Øyvind | |
dc.contributor.author | Slagstad, Trond | |
dc.date.accessioned | 2023-09-29T08:39:23Z | |
dc.date.available | 2023-09-29T08:39:23Z | |
dc.date.created | 2023-04-25T10:27:08Z | |
dc.date.issued | 2023 | |
dc.identifier.citation | Journal of the Geological Society. 2023, 180 (3), . | en_US |
dc.identifier.issn | 0016-7649 | |
dc.identifier.uri | https://hdl.handle.net/11250/3092984 | |
dc.description.abstract | The Hølonda area of the central Scandinavian Caledonides is a key for models of the Caledonian orogen owing to its Ordovician fauna of Laurentian affinity, now stranded on the Baltic side during opening of the North Atlantic. Here, we present a revised stratigraphic and tectonomagmatic model based on remapping, sedimentology, igneous geochemistry, Nd and Sr isotopes and geochronology. The Hølonda Group (c. 470–461 Ma) reflects a transition from subaerial and shallow-marine deposition on a continental shelf to deeper-water sedimentation along a subsiding slope. Adakitic and mid-ocean ridge basalt type magmatism at c. 468 Ma was succeeded by benmoreitic–rhyolitic, shoshonitic, calc-alkaline and ultra-alkaline volcanism at c. 467–465 Ma. The complex magmatism followed arc–continent collision along a microcontinent outboard of Laurentia, associated with subduction polarity flip and slab rollback. This led to rifting and opening of a wide basin and its adjoining shelf on thickened orogenic lithosphere. Associated mantle upwelling and partial melting of depleted and variably metasomatized mantle occurred in a tectonomagmatic setting comparable with that of the central Mediterranean. The Hølonda–Ilfjellet setting is unique along the Caledonian–Appalachian orogen, possibly reflecting interaction with Laurentia-derived continental terranes at the northeastern end of the Taconian–Grampian orogenic tract. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | The Geological Society | en_US |
dc.rights | Navngivelse 4.0 Internasjonal | * |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/deed.no | * |
dc.title | Mid-Ordovician stratigraphy and volcanism in the Hølonda area, Scandinavian Caledonides: complex tectonomagmatic development following arc–continent collision near the Laurentian margin of Iapetus | en_US |
dc.type | Peer reviewed | en_US |
dc.type | Journal article | en_US |
dc.description.version | publishedVersion | en_US |
dc.rights.holder | © 2023 The Author(s) | en_US |
dc.source.pagenumber | 22 | en_US |
dc.source.volume | 180 | en_US |
dc.source.journal | Journal of the Geological Society | en_US |
dc.source.issue | 3 | en_US |
dc.identifier.doi | 10.1144/jgs2022-133 | |
dc.identifier.cristin | 2143129 | |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 1 | |