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 10.1029/2005GL024636Full text not available from this repository.
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.
|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|
|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|
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