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Early cretaceous magmatism during extensional deformation within the Antarctic Peninsula Magmatic Arc

Vaughan, Alan P.M.; Millar, Ian L.. 1996 Early cretaceous magmatism during extensional deformation within the Antarctic Peninsula Magmatic Arc. Journal of South American Earth Sciences, 9 (1-2). 121-129. https://doi.org/10.1016/0895-9811(96)00032-6

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Abstract/Summary

Early Cretaceous plutonic rocks at Creswick Peaks in NW Palmer Land, Antarctic Peninsula show evidence of synmagmatic crustal extension and deformation during emplacement and cooling at 141 ±2 Ma. Deformation textures, ranging from sub-magmatic phenocryst alignment to ultramylonite, are preserved in granodiorite. Large volumes of gabbro were intruded late in the kinematic history. Crustal extension compensated by magma emplacement has occurred, and a close correspondence of ages between the shear zone, granodiorite and gabbro suggests a rapid phase of crustal growth. Extensional structures are partially overprinted by mid-Cretaceous thrusting and compression.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1016/0895-9811(96)00032-6
Programmes: BAS Programmes > Pre 2000 programme
ISSN: 08959811
Date made live: 05 Dec 2016 13:03 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/515345

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