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Understanding volcanic margin evolution through the lens of Norway's youngest granite
Geological Survey of Norway (NGU), Trondheim, Norway.
Geological Survey of Norway (NGU), Trondheim, Norway.
Geological Survey of Norway (NGU), Trondheim, Norway.
Geological Survey of Norway (NGU), Trondheim, Norway.
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2024 (Engelska)Ingår i: Terra Nova, ISSN 0954-4879, E-ISSN 1365-3121, Vol. 36, nr 4, s. 250-257Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Three boreholes drilled during the International Ocean Discovery Program (IODP) Expedition 396 have yielded unexpected findings of altered granitic rocks covered by basalt flows, interbedded sediments and glacial mud near the continent-ocean transition of the mid-Norwegian margin. U-Pb and K-Ar geochronological analyses were conducted on both protolithic and authigenically formed K-bearing minerals to determine the age of granite crystallisation and subsequent alteration episodes. The granite's crystallisation age based on 104 zircons is 56.3 ± 0.2 Ma, and subsequent exhumation along with alteration/weathering events took place between 54.7 ± 1 and 37.1 ± 1 Ma. This intrusion represents the youngest granite discovered in Norway and intruded at an extremely shallow crustal level before a rapid rift-to-drift transition. The shallow emplacement of granitic rock and its fast exhumation before and during the onset of volcanism holds significant implications for the syn- and post-breakup tectonic evolution of volcanic margins.

Ort, förlag, år, upplaga, sidor
John Wiley & Sons, 2024. Vol. 36, nr 4, s. 250-257
Nyckelord [en]
Expedition 396, granite, International Ocean Discovery Program, Kolga High, mid-Norwegian margin magmatism, Volcanic rifted margin
Nationell ämneskategori
Geologi Geofysik Klimatvetenskap
Identifikatorer
URN: urn:nbn:se:umu:diva-220571DOI: 10.1111/ter.12705ISI: 001153329400001Scopus ID: 2-s2.0-85183902393OAI: oai:DiVA.org:umu-220571DiVA, id: diva2:1835490
Tillgänglig från: 2024-02-06 Skapad: 2024-02-06 Senast uppdaterad: 2025-02-01Bibliografiskt granskad

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Jones, Morgan

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