T. Grenne, D. Gasser, R. Bøe, F. Corfu, Ø. Skår, T. Slagstad
{"title":"斯堪的纳维亚Caledonides的Hølonda地区的中奥陶世地层和火山活动:Iapetus Laurentian边缘附近弧-大陆碰撞后的复杂构造岩浆发育","authors":"T. Grenne, D. Gasser, R. Bøe, F. Corfu, Ø. Skår, T. Slagstad","doi":"10.1144/jgs2022-133","DOIUrl":null,"url":null,"abstract":"The Hølonda area of the central Scandinavian Caledonides is a key for models of the Caledonian orogen due 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 MORB-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 to 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.\n \n Thematic collection:\n This article is part of the Caledonian Wilson cycle collection available at:\n https://www.lyellcollection.org/topic/collections/the-caledonian-wilson-cycle\n \n \n Supplementary material:\n https://doi.org/10.6084/m9.figshare.c.6368922\n","PeriodicalId":17320,"journal":{"name":"Journal of the Geological Society","volume":" ","pages":""},"PeriodicalIF":2.6000,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"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\",\"authors\":\"T. Grenne, D. Gasser, R. Bøe, F. Corfu, Ø. Skår, T. Slagstad\",\"doi\":\"10.1144/jgs2022-133\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The Hølonda area of the central Scandinavian Caledonides is a key for models of the Caledonian orogen due 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 MORB-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 to that of the central Mediterranean. 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Mid-Ordovician stratigraphy and volcanism in the Hølonda area, Scandinavian Caledonides: complex tectonomagmatic development following arc–continent collision near the Laurentian margin of Iapetus
The Hølonda area of the central Scandinavian Caledonides is a key for models of the Caledonian orogen due 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 MORB-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 to 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.
Thematic collection:
This article is part of the Caledonian Wilson cycle collection available at:
https://www.lyellcollection.org/topic/collections/the-caledonian-wilson-cycle
Supplementary material:
https://doi.org/10.6084/m9.figshare.c.6368922
期刊介绍:
Journal of the Geological Society (JGS) is owned and published by the Geological Society of London.
JGS publishes topical, high-quality recent research across the full range of Earth Sciences. Papers are interdisciplinary in nature and emphasize the development of an understanding of fundamental geological processes. Broad interest articles that refer to regional studies, but which extend beyond their geographical context are also welcomed.
Each year JGS presents the ‘JGS Early Career Award'' for papers published in the journal, which rewards the writing of well-written, exciting papers from early career geologists.
The journal publishes research and invited review articles, discussion papers and thematic sets.