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Antarctic Peninsula continental magnesian andesites: indicators of ridge-trench interaction during Gondwana break-up

Alabaster, Tony; Storey, Bryan C.. 1990 Antarctic Peninsula continental magnesian andesites: indicators of ridge-trench interaction during Gondwana break-up. Journal of the Geological Society, 147 (4). 595-598. https://doi.org/10.1144/gsjgs.147.4.0595

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Abstract/Summary

Subduction of young, hot oceanic lithosphere and a major episode of lithospheric extension have been considered as key tectonomagmatic factors in the genesis of ‘Setouchi-type’ continental magnesian andesites. We present data on a new discovery of such andesites from the northern part of the Antarctic Peninsula and propose that subduction of newly created oceanic lithosphere occurred along the proto-Pacific margin of Antarctica during the Middle Jurassic. Continental magnesian andesite magmatism was contemporaneous with the early stages of Gondwana break-up and we suggest that subduction of young, hot oceanic lithosphere and ridge-trench interaction may have contributed to the disintegration of Gondwana by thermally weakening the lithosphere and developing a broad, linear extensional zone along the proto-Pacific margin.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1144/gsjgs.147.4.0595
ISSN: 0016-7649
Date made live: 14 Jun 2018 13:26 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/520275

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