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Journal of the Geological Society; 1990; v. 147; issue.4; p. 595-598;
DOI: 10.1144/gsjgs.147.4.0595
© 1990 Geological Society of London

SHORT PAPER

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

TONY ALABASTER & BRYAN C. STOREY

British Antarctic Survey, NERC, High Cross, Madingley Road, Cambridge CB3 0ET, UK

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.




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