New aerogeophysical view of the Antarctic Peninsula: more pieces, less puzzle

Ferraccioli, F.; 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. doi 10.1029/2005GL024636

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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:	Article
Identification Number/DOI:	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 Information:	Full text not available from this repository
Additional Keywords:	Aerogravity, Aeromagnetic
NORA Subject Terms:	Earth Sciences
Date made live:	29 Aug 2007 12:39
URI:	http://nora.nerc.ac.uk/id/eprint/48

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