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Analysis of James Ross Island volcanic complex and sedimentary basin based on high-resolution aeromagnetic data

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Title: Analysis of James Ross Island volcanic complex and sedimentary basin based on high-resolution aeromagnetic data
Authors: Ghidella, M.E.1 mghidella@gmail.com, Zambrano, O.M.1, Ferraccioli, F.2, Lirio, J.M.1, Zakrajsek, A.F.1, Ferris, J.2, Jordan, T.A.2
Source: Tectonophysics. Feb2013, Vol. 585, p90-101. 12p.
Subjects: Geophysics, Geomagnetism, Surveys, Sedimentary basins, Volcanoes
Geographic Terms: James Ross Island (Antarctica), Antarctica
Abstract: Abstract: High-resolution aeromagnetic surveys provide a geophysical tool to help image the subsurface structure of volcanoes and their tectonic framework. Here we interpret high-resolution aeromagnetic data and models for James Ross archipelago and surrounding regions to provide a new perspective on Neogene magmatism emplaced along the eastern margin of the Antarctic Peninsula. Based on the analysis and modelling of magnetic anomalies we were able to image the subglacial extent of Miocene to Recent alkaline rocks of the James Ross Island Volcanic Group and map tectonic structures that appear to have exerted important controls on Neogene magmatism. High-amplitude linear anomalies detected over Mount Haddington stratovolcano were modelled as caused by subvertical feeder bodies extending to a depth of at least 3km. These feeder bodies may have been emplaced along a N–S oriented volcano-tectonic rift zone. We also identified several effusive subglacial centres and imaged two concentric magnetic arcs, which we related to Neogene volcanic and subvolcanic lineaments, likely controlled by Mid-Cretaceous strike-slip fault belts and associated deformation zones. The regional magnetic quiet zone that encompasses James Ross Island is caused by the thick sedimentary infill of the Larsen Basin, and a low-amplitude magnetic high within the basin is inferred to reflect a basement push-up structure associated with strike-slip faulting along the eastern edge of the Antarctic Peninsula. In the offshore regions magnetic anomalies southwest of Tabarin Peninsula and west of Vega Island may reflect recent volcanic structures that have yet to emerge from the sea-floor. [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
An: 85173629
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Analysis of James Ross Island volcanic complex and sedimentary basin based on high-resolution aeromagnetic data
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  Data: <searchLink fieldCode="AR" term="%22Ghidella%2C+M%2EE%2E%22">Ghidella, M.E.</searchLink><relatesTo>1</relatesTo><i> mghidella@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Zambrano%2C+O%2EM%2E%22">Zambrano, O.M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ferraccioli%2C+F%2E%22">Ferraccioli, F.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Lirio%2C+J%2EM%2E%22">Lirio, J.M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zakrajsek%2C+A%2EF%2E%22">Zakrajsek, A.F.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ferris%2C+J%2E%22">Ferris, J.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Jordan%2C+T%2EA%2E%22">Jordan, T.A.</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Tectonophysics%22">Tectonophysics</searchLink>. Feb2013, Vol. 585, p90-101. 12p.
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  Label: Abstract
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  Data: Abstract: High-resolution aeromagnetic surveys provide a geophysical tool to help image the subsurface structure of volcanoes and their tectonic framework. Here we interpret high-resolution aeromagnetic data and models for James Ross archipelago and surrounding regions to provide a new perspective on Neogene magmatism emplaced along the eastern margin of the Antarctic Peninsula. Based on the analysis and modelling of magnetic anomalies we were able to image the subglacial extent of Miocene to Recent alkaline rocks of the James Ross Island Volcanic Group and map tectonic structures that appear to have exerted important controls on Neogene magmatism. High-amplitude linear anomalies detected over Mount Haddington stratovolcano were modelled as caused by subvertical feeder bodies extending to a depth of at least 3km. These feeder bodies may have been emplaced along a N–S oriented volcano-tectonic rift zone. We also identified several effusive subglacial centres and imaged two concentric magnetic arcs, which we related to Neogene volcanic and subvolcanic lineaments, likely controlled by Mid-Cretaceous strike-slip fault belts and associated deformation zones. The regional magnetic quiet zone that encompasses James Ross Island is caused by the thick sedimentary infill of the Larsen Basin, and a low-amplitude magnetic high within the basin is inferred to reflect a basement push-up structure associated with strike-slip faulting along the eastern edge of the Antarctic Peninsula. In the offshore regions magnetic anomalies southwest of Tabarin Peninsula and west of Vega Island may reflect recent volcanic structures that have yet to emerge from the sea-floor. [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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      – Type: doi
        Value: 10.1016/j.tecto.2012.06.039
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      – Code: eng
        Text: English
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        PageCount: 12
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        Type: general
      – SubjectFull: Geomagnetism
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      – SubjectFull: Surveys
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      – SubjectFull: Sedimentary basins
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      – SubjectFull: Volcanoes
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      – SubjectFull: James Ross Island (Antarctica)
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      – SubjectFull: Antarctica
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              Text: Feb2013
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