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Evidence for low‐pr...
Evidence for low‐pressure crustal anatexis during the northeast atlantic break‐up
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- Morris, A. M. (author)
- Department of Geology and Geophysics University of Utah Salt Lake City UT USA
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- Lambart, S. (author)
- Department of Geology and Geophysics University of Utah Salt Lake City UT USA
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- Stearns, M. A. (author)
- Department of Earth Sciences Utah Valley University Orem UT USA
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- Bowman, J. R. (author)
- Department of Geology and Geophysics University of Utah Salt Lake City UT USA
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- Jones, Morgan (author)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap
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- Mohn, G. (author)
- Laboratoire Géosciences et Environnement Cergy CY Cergy Paris Université Cergy France
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- Andrews, G. (author)
- School of Environmental Sciences University of Hull Hull UK
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- Millett, J. (author)
- Department of Geology and Geophysics University of Aberdeen King's College Aberdeen UK;Volcanic Basin Energy Research AS, Høienhald Oslo Norway
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- Tegner, C. (author)
- Department of Geoscience Aarhus University Aarhus Denmark
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- Chatterjee, S. (author)
- Earthquake Research Institute The University of Tokyo, Bunkyō Tokyo Japan
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- Frieling, J. (author)
- Department of Earth Sciences University of Oxford Oxford UK
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- Guo, P. (author)
- Institute of Oceanology Chinese Academy of Sciences Qingdao China
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- Jolley, D. W. (author)
- Department of Geology and Geophysics University of Aberdeen King's College Aberdeen UK
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- Cunningham, E. H. (author)
- Department of Geology and Geophysics University of Utah Salt Lake City UT USA
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- Berndt, C. (author)
- GEOMAR Helmholtz Centre for Ocean Research Kiel Kiel Germany
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- Planke, S. (author)
- Volcanic Basin Energy Research AS, Høienhald Oslo Norway;Department of Geosciences University of Oslo Oslo Norway
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- Alvarez Zarikian, C. A. (author)
- International Ocean Discovery Program Texas A&M University College Station TX USA
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- Betlem, P. (author)
- Department of Geosciences University of Oslo Oslo Norway;Department of Arctic Geology The University Centre in Svalbard (UNIS) Svalbard Norway
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- Brinkhuis, H. (author)
- NIOZ Royal Netherlands Institute for Sea Research, Den Burg Texel The Netherlands
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- Christopoulou, M. (author)
- Department of Earth Atmosphere and Environment Northern Illinois University DeKalb IL USA
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- Ferré, E. (author)
- Department of Geological Sciences New Mexico State University Las Cruces NM USA
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- Filina, I. Y. (author)
- Department of Earth and Atmospheric Sciences University of Nebraska Lincoln NE USA
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- Harper, D. T. (author)
- Department of Geology and Geophysics University of Utah Salt Lake City UT USA
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- Longman, J. (author)
- Department of Geography and Environmental Science Northumbria University Newcastle Upon Tyne UK
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- Scherer, R. P. (author)
- Department of Earth Atmosphere and Environment Northern Illinois University DeKalb IL USA
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- Varela, N. (author)
- Department of Geosciences Virginia Tech Blacksburg VA USA
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- Xu, W. (author)
- School of Earth Sciences and the SFI Research Centre in Applied Geosciences University College Dublin Dublin Ireland
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- Yager, S. L. (author)
- Department of Environment, Geology, and Natural Resources Ball State University Munice IN USA
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- Agarwal, A. (author)
- Applied Structural Geology Department of Earth Sciences Indian Institute of Technology Kanpur Kanpur India
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- Clementi, V. J. (author)
- 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
- English.
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In: Geochemistry Geophysics Geosystems. - : American Geophysical Union (AGU). - 1525-2027. ; 25:7
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https://umu.diva-por... (primary) (Raw object)
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Abstract
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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.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Morris, A. M.
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Lambart, S.
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Stearns, M. A.
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Bowman, J. R.
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Jones, Morgan
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Mohn, G.
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Andrews, G.
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Millett, J.
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Tegner, C.
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Chatterjee, S.
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Frieling, J.
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Guo, P.
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Jolley, D. W.
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Cunningham, E. H ...
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Berndt, C.
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Planke, S.
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Alvarez Zarikian ...
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Betlem, P.
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Brinkhuis, H.
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Christopoulou, M ...
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Ferré, E.
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Filina, I. Y.
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Harper, D. T.
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Longman, J.
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Scherer, R. P.
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Varela, N.
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Xu, W.
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Yager, S. L.
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Agarwal, A.
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Clementi, V. J.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Geology
- Articles in the publication
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Geochemistry Geo ...
- By the university
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Umeå University