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Crustal architecture of the Wilkes Subglacial Basin in East Antarctica, as revealed from airborne gravity data

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Title: Crustal architecture of the Wilkes Subglacial Basin in East Antarctica, as revealed from airborne gravity data
Authors: Jordan, T.A.1 tomj@bas.ac.uk, Ferraccioli, F.1, Armadillo, E.2, Bozzo, E.2
Source: Tectonophysics. Feb2013, Vol. 585, p196-206. 11p.
Subjects: Geological basins, Geomagnetism, Gravity, Data analysis, Crust of the earth, Earth (Planet)
Geographic Terms: Transantarctic Mountains (Antarctica), Wilkes Land (Antarctica), East Antarctica (Antarctica), Antarctica
Abstract: Abstract: The Wilkes Subglacial Basin, in the hinterland of the Transantarctic Mountains, represents one of the least understood continental-scale features in Antarctica. Aeromagnetic data suggests that this basin may be imposed on a Ross age back arc region adjacent to the East Antarctic Craton. However, the evolution of the deeper crustal structure is disputed. Here, we present new airborne gravity data that reveals the crustal architecture of the northern Wilkes Subglacial Basin. Our gravity models indicate that the crust under the northern Wilkes Subglacial Basin is 30–35km thick, i.e. ca 5–10km thinner than imaged under the Transantarctic Mountains, and ~15km thinner than predicted from some flexural and seismic models in the southern Wilkes Basin. We suggest that crustal thickening under northern Victoria Land reflects Ross-age (ca 500Ma) orogenic events. Airy isostatic anomalies along both flanks of the Wilkes Basin reveal major inherited tectonic structures, which likely controlled the basin location, supporting aeromagnetic interpretations of the Wilkes Subglacial Basin as a structurally controlled basin. The positive anomaly along the western margin of the basin defines the boundary between the East Antarctic Craton and the Ross Orogen, and the anomaly along its eastern flank likely reflects high-grade rocks of the central Wilson Terrane. Our models indicate that the crust is ~5km thinner beneath the northern Wilkes Basin, compared to formerly contiguous segments of the Delamerian Orogen in south-eastern Australia. The thinner crust may be linked to: i) back-arc basin formation or orogenic collapse processes and segmentation within the Ross\Delamerian Orogen, ii) Jurassic to Cretaceous extension prior to break-up between Australia and East Antarctica, iii) Cenozoic glacial erosion or most likely, iv) a combination of these processes. [Copyright &y& Elsevier]
Copyright of Tectonophysics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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PubType: Academic Journal
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  Data: Crustal architecture of the Wilkes Subglacial Basin in East Antarctica, as revealed from airborne gravity data
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  Data: <searchLink fieldCode="AR" term="%22Jordan%2C+T%2EA%2E%22">Jordan, T.A.</searchLink><relatesTo>1</relatesTo><i> tomj@bas.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Ferraccioli%2C+F%2E%22">Ferraccioli, F.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Armadillo%2C+E%2E%22">Armadillo, E.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Bozzo%2C+E%2E%22">Bozzo, E.</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Tectonophysics%22">Tectonophysics</searchLink>. Feb2013, Vol. 585, p196-206. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Transantarctic+Mountains+%28Antarctica%29%22">Transantarctic Mountains (Antarctica)</searchLink><br /><searchLink fieldCode="DE" term="%22Wilkes+Land+%28Antarctica%29%22">Wilkes Land (Antarctica)</searchLink><br /><searchLink fieldCode="DE" term="%22East+Antarctica+%28Antarctica%29%22">East Antarctica (Antarctica)</searchLink><br /><searchLink fieldCode="DE" term="%22Antarctica%22">Antarctica</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract: The Wilkes Subglacial Basin, in the hinterland of the Transantarctic Mountains, represents one of the least understood continental-scale features in Antarctica. Aeromagnetic data suggests that this basin may be imposed on a Ross age back arc region adjacent to the East Antarctic Craton. However, the evolution of the deeper crustal structure is disputed. Here, we present new airborne gravity data that reveals the crustal architecture of the northern Wilkes Subglacial Basin. Our gravity models indicate that the crust under the northern Wilkes Subglacial Basin is 30–35km thick, i.e. ca 5–10km thinner than imaged under the Transantarctic Mountains, and ~15km thinner than predicted from some flexural and seismic models in the southern Wilkes Basin. We suggest that crustal thickening under northern Victoria Land reflects Ross-age (ca 500Ma) orogenic events. Airy isostatic anomalies along both flanks of the Wilkes Basin reveal major inherited tectonic structures, which likely controlled the basin location, supporting aeromagnetic interpretations of the Wilkes Subglacial Basin as a structurally controlled basin. The positive anomaly along the western margin of the basin defines the boundary between the East Antarctic Craton and the Ross Orogen, and the anomaly along its eastern flank likely reflects high-grade rocks of the central Wilson Terrane. Our models indicate that the crust is ~5km thinner beneath the northern Wilkes Basin, compared to formerly contiguous segments of the Delamerian Orogen in south-eastern Australia. The thinner crust may be linked to: i) back-arc basin formation or orogenic collapse processes and segmentation within the Ross\Delamerian Orogen, ii) Jurassic to Cretaceous extension prior to break-up between Australia and East Antarctica, iii) Cenozoic glacial erosion or most likely, iv) a combination of these processes. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Tectonophysics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1016/j.tecto.2012.06.041
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 11
        StartPage: 196
    Subjects:
      – SubjectFull: Geological basins
        Type: general
      – SubjectFull: Geomagnetism
        Type: general
      – SubjectFull: Gravity
        Type: general
      – SubjectFull: Data analysis
        Type: general
      – SubjectFull: Crust of the earth
        Type: general
      – SubjectFull: Earth (Planet)
        Type: general
      – SubjectFull: Transantarctic Mountains (Antarctica)
        Type: general
      – SubjectFull: Wilkes Land (Antarctica)
        Type: general
      – SubjectFull: East Antarctica (Antarctica)
        Type: general
      – SubjectFull: Antarctica
        Type: general
    Titles:
      – TitleFull: Crustal architecture of the Wilkes Subglacial Basin in East Antarctica, as revealed from airborne gravity data
        Type: main
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            NameFull: Jordan, T.A.
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            NameFull: Ferraccioli, F.
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            NameFull: Armadillo, E.
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            NameFull: Bozzo, E.
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            – D: 11
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              Text: Feb2013
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              Y: 2013
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              Value: 585
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