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Sökning: WFRF:(Stearns D.) > (2020-2024) > Evidence for low‐pr...

Evidence for low‐pressure crustal anatexis during the northeast atlantic break‐up

Morris, A. M. (författare)
Department of Geology and Geophysics University of Utah Salt Lake City UT USA
Lambart, S. (författare)
Department of Geology and Geophysics University of Utah Salt Lake City UT USA
Stearns, M. A. (författare)
Department of Earth Sciences Utah Valley University Orem UT USA
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Bowman, J. R. (författare)
Department of Geology and Geophysics University of Utah Salt Lake City UT USA
Jones, Morgan (författare)
Umeå universitet,Institutionen för ekologi, miljö och geovetenskap
Mohn, G. (författare)
Laboratoire Géosciences et Environnement Cergy CY Cergy Paris Université Cergy France
Andrews, G. (författare)
School of Environmental Sciences University of Hull Hull UK
Millett, J. (författare)
Department of Geology and Geophysics University of Aberdeen King's College Aberdeen UK;Volcanic Basin Energy Research AS, Høienhald Oslo Norway
Tegner, C. (författare)
Department of Geoscience Aarhus University Aarhus Denmark
Chatterjee, S. (författare)
Earthquake Research Institute The University of Tokyo, Bunkyō Tokyo Japan
Frieling, J. (författare)
Department of Earth Sciences University of Oxford Oxford UK
Guo, P. (författare)
Institute of Oceanology Chinese Academy of Sciences Qingdao China
Jolley, D. W. (författare)
Department of Geology and Geophysics University of Aberdeen King's College Aberdeen UK
Cunningham, E. H. (författare)
Department of Geology and Geophysics University of Utah Salt Lake City UT USA
Berndt, C. (författare)
GEOMAR Helmholtz Centre for Ocean Research Kiel Kiel Germany
Planke, S. (författare)
Volcanic Basin Energy Research AS, Høienhald Oslo Norway;Department of Geosciences University of Oslo Oslo Norway
Alvarez Zarikian, C. A. (författare)
International Ocean Discovery Program Texas A&M University College Station TX USA
Betlem, P. (författare)
Department of Geosciences University of Oslo Oslo Norway;Department of Arctic Geology The University Centre in Svalbard (UNIS) Svalbard Norway
Brinkhuis, H. (författare)
NIOZ Royal Netherlands Institute for Sea Research, Den Burg Texel The Netherlands
Christopoulou, M. (författare)
Department of Earth Atmosphere and Environment Northern Illinois University DeKalb IL USA
Ferré, E. (författare)
Department of Geological Sciences New Mexico State University Las Cruces NM USA
Filina, I. Y. (författare)
Department of Earth and Atmospheric Sciences University of Nebraska Lincoln NE USA
Harper, D. T. (författare)
Department of Geology and Geophysics University of Utah Salt Lake City UT USA
Longman, J. (författare)
Department of Geography and Environmental Science Northumbria University Newcastle Upon Tyne UK
Scherer, R. P. (författare)
Department of Earth Atmosphere and Environment Northern Illinois University DeKalb IL USA
Varela, N. (författare)
Department of Geosciences Virginia Tech Blacksburg VA USA
Xu, W. (författare)
School of Earth Sciences and the SFI Research Centre in Applied Geosciences University College Dublin Dublin Ireland
Yager, S. L. (författare)
Department of Environment, Geology, and Natural Resources Ball State University Munice IN USA
Agarwal, A. (författare)
Applied Structural Geology Department of Earth Sciences Indian Institute of Technology Kanpur Kanpur India
Clementi, V. J. (författare)
Department of Marine and Coastal Sciences Rutgers University New Brunswick NJ USA
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 (creator_code:org_t)
American Geophysical Union (AGU), 2024
2024
Engelska.
Ingår i: Geochemistry Geophysics Geosystems. - : American Geophysical Union (AGU). - 1525-2027. ; 25:7
Relaterad länk:
https://doi.org/10.1...
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https://umu.diva-por... (primary) (Raw object)
https://urn.kb.se/re...
https://doi.org/10.1...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • While basaltic volcanism is dominant during rifting and continental breakup, felsic magmatism may be a significant component of some rift margins. During International Ocean Discovery Program (IODP) Expedition 396 on the continental margin of Norway, a graphite-garnet-cordierite bearing dacitic unit (the Mimir dacite) was recovered in two holes within early Eocene sediments on Mimir High (Site U1570), a marginal high on the Vøring Transform Margin. Here, we present a comprehensive textural, petrological, and geochemical study of the Mimir dacite in order to assess its origin and discuss the geodynamic implications. The major mineral phases (garnet, cordierite, quartz, plagioclase, alkali feldspar) are hosted in a fresh rhyolitic, vesicular, glassy matrix that is locally mingled with sediments. The major element chemistry of garnet and cordierite, the presence of zircon inclusions with inherited cores, and thermobarometric calculations all support an upper crustal metapelitic origin. While most magma-rich margin models favor crustal anatexis in the lower crust, thermobarometric calculations performed here show that the Mimir dacite was produced at upper-crustal depths (<5 kbar, 18 km depth) and high temperature (750–800°C) with up to 3 wt% water content. In situ U-Pb analyses on zircon inclusions give a magmatic crystallization age of 54.6 ± 1.1 Ma, consistent with emplacement that post-dates the Paleocene-Eocene Thermal Maximum. Our results suggest that the opening of the Northeast Atlantic was associated with a phase of low-pressure, high-temperature crustal anatexis preceding the main phase of magmatism.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Geology (hsv//eng)

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