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Geochemistry of the Davis and Aurora Banks: Possible implications on evolution of the North Scotia Ridge

Geochemistry of the Davis and Aurora Banks: Possible implications on evolution of the North Scotia Ridge
Geochemistry of the Davis and Aurora Banks: Possible implications on evolution of the North Scotia Ridge
Geochemistry of volcanic rocks of the Davis and Aurora Banks, North Scotia Ridge, is presented with the aim to infer their petrogenesis and implications in regional tectonics. The analyses show consistent major and trace element patterns which are conformable with calc-alkaline series volcanics with typical signatures of subduction zone magma. The source melt of the studied volcanics is deciphered to be subduction zone mantle wedge metasomatised by sediments. Geochemical analyses of the volcanics from the Davis and Aurora Banks are compared with geochemical data of volcanics of the South Sandwich island arc and Jurassic, Cretaceous and Paleogene arc volcanics of Patagonia, South America. This comparative study shows that the Davis and Aurora Banks' volcanics are akin to Cretaceous arc volcanics of the Hardy Formation, South America. Rocks of Hardy Formation are also reported from South Georgia. Further, based on established trace element ratio diagrams, it is deciphered that source magma characteristics of arc volcanics from South Georgia, Hardy Formation and Davis and Aurora Banks are the same. Integration of our findings with previous studies, we propose a geodynamic model for the Davis and Aurora Banks in conformity with accepted model for the evolution of the West Scotia Sea.

geochemistry, Davis Bank, Aurora Bank, North Scotia Ridge
9781402065118
0025-3227
106-114
Pandey, Anju
533d3b6d-8aed-4445-a15b-0c51e29c8223
Parson, Lindsay
8985a003-911e-402e-a858-3ecbd09d6771
Milton, Andy
9e183221-d0d4-4ddb-aeba-0fdde9d31230
Pandey, Anju
533d3b6d-8aed-4445-a15b-0c51e29c8223
Parson, Lindsay
8985a003-911e-402e-a858-3ecbd09d6771
Milton, Andy
9e183221-d0d4-4ddb-aeba-0fdde9d31230

Pandey, Anju, Parson, Lindsay and Milton, Andy (2010) Geochemistry of the Davis and Aurora Banks: Possible implications on evolution of the North Scotia Ridge. Marine Geology, 268 (1-4), 106-114. (doi:10.1016/j.margeo.2009.10.025).

Record type: Article

Abstract

Geochemistry of volcanic rocks of the Davis and Aurora Banks, North Scotia Ridge, is presented with the aim to infer their petrogenesis and implications in regional tectonics. The analyses show consistent major and trace element patterns which are conformable with calc-alkaline series volcanics with typical signatures of subduction zone magma. The source melt of the studied volcanics is deciphered to be subduction zone mantle wedge metasomatised by sediments. Geochemical analyses of the volcanics from the Davis and Aurora Banks are compared with geochemical data of volcanics of the South Sandwich island arc and Jurassic, Cretaceous and Paleogene arc volcanics of Patagonia, South America. This comparative study shows that the Davis and Aurora Banks' volcanics are akin to Cretaceous arc volcanics of the Hardy Formation, South America. Rocks of Hardy Formation are also reported from South Georgia. Further, based on established trace element ratio diagrams, it is deciphered that source magma characteristics of arc volcanics from South Georgia, Hardy Formation and Davis and Aurora Banks are the same. Integration of our findings with previous studies, we propose a geodynamic model for the Davis and Aurora Banks in conformity with accepted model for the evolution of the West Scotia Sea.

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More information

Published date: 15 January 2010
Keywords: geochemistry, Davis Bank, Aurora Bank, North Scotia Ridge
Organisations: Marine Geoscience

Identifiers

Local EPrints ID: 72087
URI: http://eprints.soton.ac.uk/id/eprint/72087
ISBN: 9781402065118
ISSN: 0025-3227
PURE UUID: 9e5a11c6-faa9-4179-b199-81ea1470fea6
ORCID for Andy Milton: ORCID iD orcid.org/0000-0003-4245-5532

Catalogue record

Date deposited: 19 Jan 2010
Last modified: 14 Mar 2024 02:39

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Contributors

Author: Anju Pandey
Author: Lindsay Parson
Author: Andy Milton ORCID iD

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