New aerogeophysical view of the Antarctic Peninsula: More pieces, less puzzle
Article first published online: 11 MAR 2006
Copyright 2006 by the American Geophysical Union.
Geophysical Research Letters
Volume 33, Issue 5, March 2006
How to Cite
2006), New aerogeophysical view of the Antarctic Peninsula: More pieces, less puzzle, Geophys. Res. Lett., 33, L05310, doi:10.1029/2005GL024636., , , and (
- Issue published online: 11 MAR 2006
- Article first published online: 11 MAR 2006
- Manuscript Accepted: 28 DEC 2005
- Manuscript Revised: 8 DEC 2005
- Manuscript Received: 13 SEP 2005
 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.