New aerogeophysical view of the Antarctic Peninsula: more pieces, less puzzle
Ferraccioli, F. ORCID: https://orcid.org/0000-0002-9347-4736; Jones, P.C.; Vaughan, A.P.M.; Leat, P.T.; Dean, A.. 2006 New aerogeophysical view of the Antarctic Peninsula: more pieces, less puzzle. Geophysical Research Letters, 33 (5), L05310. 4, pp. 10.1029/2005GL024636
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Copyright 2006 by the American Geophysical Union Geophysical Research Letters - 2006 - Ferraccioli - New aerogeophysical view of the Antarctic Peninsula More pieces less.pdf - Published Version Download (3MB) | Preview |
Abstract/Summary
New airborne geophysical data reveal subglacial imprints of crustal growth of the Antarctic Peninsula by Mesozoic arc magmatism and terrane accretion along the paleo-Pacific margin of Gondwana. Potential field signatures indicate that the Antarctic Peninsula batholith is a composite magmatic arc terrane comprising two distinct arcs, separated by a >1500 km-long suture zone, similar to the Peninsular Ranges batholith in southern and Baja California. Aeromagnetic, aerogravity and geological data suggest that a mafic Early Cretaceous western arc was juxtaposed against a more felsic eastern arc which, in mid-Cretaceous times, was intruded by highly magnetic tonalitic/granodioritic plutons of island arc affinity. Suturing of the two arcs against the Gondwana margin caused the mid-Cretaceous Palmer Land orogenic event. Convergence and suturing may have been driven by two subduction zones or, alternatively, by a decrease in slab dip, leading to an inboard migration of the arc, as in California.
Item Type: | Publication - Article |
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Digital Object Identifier (DOI): | 10.1029/2005GL024636 |
Programmes: | BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Antarctica in the Dynamic Global Plate System |
ISSN: | 0094-8276 |
Additional Keywords: | Aerogravity, Aeromagnetic |
NORA Subject Terms: | Earth Sciences |
Date made live: | 29 Aug 2007 12:39 +0 (UTC) |
URI: | https://nora.nerc.ac.uk/id/eprint/48 |
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