Evidence for Low‐Pressure Crustal Anatexis During the Northeast Atlantic Break‐Up
Abstract 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 dac...
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2024-07-01
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| Series: | Geochemistry, Geophysics, Geosystems |
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| Online Access: | https://doi.org/10.1029/2023GC011413 |
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| author | A. M. Morris S. Lambart M. A. Stearns J. R. Bowman M. T. Jones G. Mohn G. Andrews J. Millett C. Tegner S. Chatterjee J. Frieling P. Guo D. W. Jolley E. H. Cunningham C. Berndt S. Planke C. A. Alvarez Zarikian P. Betlem H. Brinkhuis M. Christopoulou E. Ferré I. Y. Filina D. T. Harper J. Longman R. P. Scherer N. Varela W. Xu S. L. Yager A. Agarwal V. J. Clementi |
| author_facet | A. M. Morris S. Lambart M. A. Stearns J. R. Bowman M. T. Jones G. Mohn G. Andrews J. Millett C. Tegner S. Chatterjee J. Frieling P. Guo D. W. Jolley E. H. Cunningham C. Berndt S. Planke C. A. Alvarez Zarikian P. Betlem H. Brinkhuis M. Christopoulou E. Ferré I. Y. Filina D. T. Harper J. Longman R. P. Scherer N. Varela W. Xu S. L. Yager A. Agarwal V. J. Clementi |
| author_sort | A. M. Morris |
| collection | DOAJ |
| description | Abstract 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. |
| format | Article |
| id | doaj-art-747e4d671ffe4ce3af2b5c83e9fea98a |
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| language | English |
| publishDate | 2024-07-01 |
| publisher | Wiley |
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| series | Geochemistry, Geophysics, Geosystems |
| spelling | doaj-art-747e4d671ffe4ce3af2b5c83e9fea98a2025-08-20T02:31:27ZengWileyGeochemistry, Geophysics, Geosystems1525-20272024-07-01257n/an/a10.1029/2023GC011413Evidence for Low‐Pressure Crustal Anatexis During the Northeast Atlantic Break‐UpA. M. Morris0S. Lambart1M. A. Stearns2J. R. Bowman3M. T. Jones4G. Mohn5G. Andrews6J. Millett7C. Tegner8S. Chatterjee9J. Frieling10P. Guo11D. W. Jolley12E. H. Cunningham13C. Berndt14S. Planke15C. A. Alvarez Zarikian16P. Betlem17H. Brinkhuis18M. Christopoulou19E. Ferré20I. Y. Filina21D. T. Harper22J. Longman23R. P. Scherer24N. Varela25W. Xu26S. L. Yager27A. Agarwal28V. J. Clementi29Department of Geology and Geophysics University of Utah Salt Lake City UT USADepartment of Geology and Geophysics University of Utah Salt Lake City UT USADepartment of Earth Sciences Utah Valley University Orem UT USADepartment of Geology and Geophysics University of Utah Salt Lake City UT USADepartment of Ecology and Environmental Science Umeå University Umeå SwedenLaboratoire Géosciences et Environnement Cergy CY Cergy Paris Université Cergy FranceSchool of Environmental Sciences University of Hull Hull UKDepartment of Geology and Geophysics University of Aberdeen King's College Aberdeen UKDepartment of Geoscience Aarhus University Aarhus DenmarkEarthquake Research Institute The University of Tokyo, Bunkyō Tokyo JapanDepartment of Earth Sciences University of Oxford Oxford UKInstitute of Oceanology Chinese Academy of Sciences Qingdao ChinaDepartment of Geology and Geophysics University of Aberdeen King's College Aberdeen UKDepartment of Geology and Geophysics University of Utah Salt Lake City UT USAGEOMAR Helmholtz Centre for Ocean Research Kiel Kiel GermanyVolcanic Basin Energy Research AS, Høienhald Oslo NorwayInternational Ocean Discovery Program Texas A&M University College Station TX USADepartment of Geosciences University of Oslo Oslo NorwayNIOZ Royal Netherlands Institute for Sea Research, Den Burg Texel The NetherlandsDepartment of Earth Atmosphere and Environment Northern Illinois University DeKalb IL USADepartment of Geological Sciences New Mexico State University Las Cruces NM USADepartment of Earth and Atmospheric Sciences University of Nebraska Lincoln NE USADepartment of Geology and Geophysics University of Utah Salt Lake City UT USADepartment of Geography and Environmental Science Northumbria University Newcastle Upon Tyne UKDepartment of Earth Atmosphere and Environment Northern Illinois University DeKalb IL USADepartment of Geosciences Virginia Tech Blacksburg VA USASchool of Earth Sciences and the SFI Research Centre in Applied Geosciences University College Dublin Dublin IrelandDepartment of Environment, Geology, and Natural Resources Ball State University Munice IN USAApplied Structural Geology Department of Earth Sciences Indian Institute of Technology Kanpur Kanpur IndiaDepartment of Marine and Coastal Sciences Rutgers University New Brunswick NJ USAAbstract 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.https://doi.org/10.1029/2023GC011413crustal anatexisMimir HighIODP Site U1570continental break‐upNAIP |
| spellingShingle | A. M. Morris S. Lambart M. A. Stearns J. R. Bowman M. T. Jones G. Mohn G. Andrews J. Millett C. Tegner S. Chatterjee J. Frieling P. Guo D. W. Jolley E. H. Cunningham C. Berndt S. Planke C. A. Alvarez Zarikian P. Betlem H. Brinkhuis M. Christopoulou E. Ferré I. Y. Filina D. T. Harper J. Longman R. P. Scherer N. Varela W. Xu S. L. Yager A. Agarwal V. J. Clementi Evidence for Low‐Pressure Crustal Anatexis During the Northeast Atlantic Break‐Up Geochemistry, Geophysics, Geosystems crustal anatexis Mimir High IODP Site U1570 continental break‐up NAIP |
| title | Evidence for Low‐Pressure Crustal Anatexis During the Northeast Atlantic Break‐Up |
| title_full | Evidence for Low‐Pressure Crustal Anatexis During the Northeast Atlantic Break‐Up |
| title_fullStr | Evidence for Low‐Pressure Crustal Anatexis During the Northeast Atlantic Break‐Up |
| title_full_unstemmed | Evidence for Low‐Pressure Crustal Anatexis During the Northeast Atlantic Break‐Up |
| title_short | Evidence for Low‐Pressure Crustal Anatexis During the Northeast Atlantic Break‐Up |
| title_sort | evidence for low pressure crustal anatexis during the northeast atlantic break up |
| topic | crustal anatexis Mimir High IODP Site U1570 continental break‐up NAIP |
| url | https://doi.org/10.1029/2023GC011413 |
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