{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,18]],"date-time":"2026-02-18T03:49:41Z","timestamp":1771386581019,"version":"3.50.1"},"reference-count":103,"publisher":"Geological Society of London","issue":"3","license":[{"start":{"date-parts":[[2023,3,28]],"date-time":"2023-03-28T00:00:00Z","timestamp":1679961600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["www.lyellcollection.org"],"crossmark-restriction":true},"short-container-title":["JGS"],"published-print":{"date-parts":[[2023,5,5]]},"abstract":"<jats:p>\n            The H\u00f8londa 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 H\u00f8londa Group (\n            <jats:italic>c.<\/jats:italic>\n            470\u2013461\u2005Ma) 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\n            <jats:italic>c.<\/jats:italic>\n            468\u2005Ma was succeeded by benmoreitic\u2013rhyolitic, shoshonitic, calc-alkaline and ultra-alkaline volcanism at\n            <jats:italic>c.<\/jats:italic>\n            467\u2013465\u2005Ma. The complex magmatism followed arc\u2013continent 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 H\u00f8londa\u2013Ilfjellet setting is unique along the Caledonian\u2013Appalachian orogen, possibly reflecting interaction with Laurentia-derived continental terranes at the northeastern end of the Taconian\u2013Grampian orogenic tract.\n          <\/jats:p>\n          <jats:p content-type=\"supplementary-material\">\n            <jats:bold>Supplementary material:<\/jats:bold>\n            Analytical data and supplementary figures are available at\n            <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" specific-use=\"dataset is-supplemented-by\" xlink:href=\"https:\/\/doi.org\/10.6084\/m9.figshare.c.6368922\">https:\/\/doi.org\/10.6084\/m9.figshare.c.6368922<\/jats:ext-link>\n          <\/jats:p>\n          <jats:p content-type=\"thematic-collection\">\n            <jats:bold>Thematic collection:<\/jats:bold>\n            This article is part of the Caledonian Wilson cycle collection available at:\n            <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"https:\/\/www.lyellcollection.org\/topic\/collections\/the-caledonian-wilson-cycle\">https:\/\/www.lyellcollection.org\/topic\/collections\/the-caledonian-wilson-cycle<\/jats:ext-link>\n          <\/jats:p>","DOI":"10.1144\/jgs2022-133","type":"journal-article","created":{"date-parts":[[2023,2,1]],"date-time":"2023-02-01T11:30:16Z","timestamp":1675251016000},"update-policy":"https:\/\/doi.org\/10.1144\/crossmark-policy","source":"Crossref","is-referenced-by-count":3,"title":["Mid-Ordovician stratigraphy and volcanism in the H\u00f8londa area, Scandinavian Caledonides: complex tectonomagmatic development following arc\u2013continent collision near the Laurentian margin of Iapetus"],"prefix":"10.1144","volume":"180","author":[{"given":"Tor","family":"Grenne","sequence":"first","affiliation":[{"name":"Geological Survey of Norway, PO Box, 6315 Torgarden, 7491 Trondheim, Norway"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7300-8984","authenticated-orcid":true,"given":"Deta","family":"Gasser","sequence":"additional","affiliation":[{"name":"Geological Survey of Norway, PO Box, 6315 Torgarden, 7491 Trondheim, Norway"},{"name":"Department of Environmental Sciences, Western Norway University of Applied Sciences, R\u00f8yrgata 6, 6856 Sogndal, Norway"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9486-3530","authenticated-orcid":false,"given":"Reidulv","family":"B\u00f8e","sequence":"additional","affiliation":[{"name":"Geological Survey of Norway, PO Box, 6315 Torgarden, 7491 Trondheim, Norway"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9370-4239","authenticated-orcid":false,"given":"Fernando","family":"Corfu","sequence":"additional","affiliation":[{"name":"Department of Geosciences and CEED, University of Oslo, PO Box 1047, Blindern, 0316 Oslo, Norway"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9174-490X","authenticated-orcid":false,"given":"\u00d8yvind","family":"Sk\u00e5r","sequence":"additional","affiliation":[{"name":"Geological Survey of Norway, PO Box, 6315 Torgarden, 7491 Trondheim, Norway"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8059-2426","authenticated-orcid":false,"given":"Trond","family":"Slagstad","sequence":"additional","affiliation":[{"name":"Geological Survey of Norway, PO Box, 6315 Torgarden, 7491 Trondheim, Norway"}]}],"member":"1881","published-online":{"date-parts":[[2023,3,28]]},"reference":[{"key":"e_1_3_6_2_1","doi-asserted-by":"publisher","DOI":"10.1093\/petroj\/39.5.905"},{"key":"e_1_3_6_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/bre.12245"},{"key":"e_1_3_6_4_1","first-page":"295","article-title":"Whiterockian (Ordovician) conodonts from the H\u00f8londa Limestone of the Trondheim Region, Norwegian Caledonides","volume":"59","author":"Bergstr\u00f6m S.M","year":"1979","unstructured":"Bergstr\u00f6m, S.M. 1979. 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