Subglacial imprints of early Gondwana break-up as identified from high resolution aerogeophysical data over western Dronning Maud Land, East Antarctica.
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| Title: | Subglacial imprints of early Gondwana break-up as identified from high resolution aerogeophysical data over western Dronning Maud Land, East Antarctica. |
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| Authors: | Ferraccioli, F.1 ffe@bas.ac.uk, Jones, P. C.1, Curtis, M. L.1, Leat, P. T.1 |
| Source: | Terra Nova. Dec2005, Vol. 17 Issue 6, p573-579. 7p. |
| Subjects: | Rifts (Geology), Gondwana (Continent), Geophysics, Ice streams, Glaciers, Magmatism, Continents, Physical geology |
| Geographic Terms: | East Antarctica (Antarctica) |
| Abstract: | Determining the location and geometry of possible subglacial rifts in western Dronning Maud Land is a key element to address processes leading to early Gondwana break-up. However, previous geophysical investigations did not lead to unambiguous delineation of rift structures over this region. We interpret high-resolution airborne radar and aerogravity data to image subglacial rift structures. Subglacial topography, free-air and Bouguer gravity maps, coupled with 3D inverse gravity models, image a rift–rift–rift triple junction at the intersection of the Jutulstraumen ice stream and the Pencksökket glacier. These continental rifts were associated with alkaline and tholeiitic intrusions, minor dyke swarms and flood basalts of Jurassic age, but not with huge volumes of Karoo magmatism, such as that which characterizes the southern Africa conjugate margin. The western Dronning Maud Land triple junction may be linked to the Karoo mantle plume and represents an early stage of magmatism and rifting during Gondwana break-up. [ABSTRACT FROM AUTHOR] |
| Copyright of Terra Nova is the property of Wiley-Blackwell 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.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 18943128 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Subglacial imprints of early Gondwana break-up as identified from high resolution aerogeophysical data over western Dronning Maud Land, East Antarctica. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Ferraccioli%2C+F%2E%22">Ferraccioli, F.</searchLink><relatesTo>1</relatesTo><i> ffe@bas.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Jones%2C+P%2E+C%2E%22">Jones, P. C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Curtis%2C+M%2E+L%2E%22">Curtis, M. L.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Leat%2C+P%2E+T%2E%22">Leat, P. T.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Terra+Nova%22">Terra Nova</searchLink>. Dec2005, Vol. 17 Issue 6, p573-579. 7p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Rifts+%28Geology%29%22">Rifts (Geology)</searchLink><br /><searchLink fieldCode="DE" term="%22Gondwana+%28Continent%29%22">Gondwana (Continent)</searchLink><br /><searchLink fieldCode="DE" term="%22Geophysics%22">Geophysics</searchLink><br /><searchLink fieldCode="DE" term="%22Ice+streams%22">Ice streams</searchLink><br /><searchLink fieldCode="DE" term="%22Glaciers%22">Glaciers</searchLink><br /><searchLink fieldCode="DE" term="%22Magmatism%22">Magmatism</searchLink><br /><searchLink fieldCode="DE" term="%22Continents%22">Continents</searchLink><br /><searchLink fieldCode="DE" term="%22Physical+geology%22">Physical geology</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22East+Antarctica+%28Antarctica%29%22">East Antarctica (Antarctica)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Determining the location and geometry of possible subglacial rifts in western Dronning Maud Land is a key element to address processes leading to early Gondwana break-up. However, previous geophysical investigations did not lead to unambiguous delineation of rift structures over this region. We interpret high-resolution airborne radar and aerogravity data to image subglacial rift structures. Subglacial topography, free-air and Bouguer gravity maps, coupled with 3D inverse gravity models, image a rift–rift–rift triple junction at the intersection of the Jutulstraumen ice stream and the Pencksökket glacier. These continental rifts were associated with alkaline and tholeiitic intrusions, minor dyke swarms and flood basalts of Jurassic age, but not with huge volumes of Karoo magmatism, such as that which characterizes the southern Africa conjugate margin. The western Dronning Maud Land triple junction may be linked to the Karoo mantle plume and represents an early stage of magmatism and rifting during Gondwana break-up. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Terra Nova is the property of Wiley-Blackwell 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: BibEntity: Identifiers: – Type: doi Value: 10.1111/j.1365-3121.2005.00651.x Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 7 StartPage: 573 Subjects: – SubjectFull: Rifts (Geology) Type: general – SubjectFull: Gondwana (Continent) Type: general – SubjectFull: Geophysics Type: general – SubjectFull: Ice streams Type: general – SubjectFull: Glaciers Type: general – SubjectFull: Magmatism Type: general – SubjectFull: Continents Type: general – SubjectFull: Physical geology Type: general – SubjectFull: East Antarctica (Antarctica) Type: general Titles: – TitleFull: Subglacial imprints of early Gondwana break-up as identified from high resolution aerogeophysical data over western Dronning Maud Land, East Antarctica. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Ferraccioli, F. – PersonEntity: Name: NameFull: Jones, P. C. – PersonEntity: Name: NameFull: Curtis, M. L. – PersonEntity: Name: NameFull: Leat, P. T. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 12 Text: Dec2005 Type: published Y: 2005 Identifiers: – Type: issn-print Value: 09544879 Numbering: – Type: volume Value: 17 – Type: issue Value: 6 Titles: – TitleFull: Terra Nova Type: main |
| ResultId | 1 |
