An Upper Mesozoic island-arc–back-arc system in the southern Andes and South Georgia

Suárez, M.; Pettigrew, T.H.. 1976 An Upper Mesozoic island-arc–back-arc system in the southern Andes and South Georgia. Geological Magazine, 113 (4). 305-328. https://doi.org/10.1017/S0016756800047592

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Official URL: http://dx.doi.org/10.1017/S0016756800047592

Abstract/Summary

The Upper Jurassic–Lower Cretaceous strato-tectonic belts of the southern Andes and South Georgia, 2000 km apart, can be correlated and explained as the products of an island-arc–back-arc system. From the Pacific Ocean to the Atlantic, these belts, which exhibit structural and metamorphic differences, are: (1) a pyroclastic belt developed on an ensialic volcanic arc; (2) a back-arc flysch sequence underlain in the southern Andes by a basic complex with oceanic affinities; this was intruded into continental crust as a result of sea-floor spreading which created a marginal basin; (3) a slate sequence deposited on a continental shelf. The pyroclastic and marginal basin belts and the adjacent part of the continental shelf were folded and uplifted during the early Upper Cretaceous, whereas the foreland part of the continental shelf assemblage underwent deformation during the early Tertiary.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1017/S0016756800047592
ISSN:	0016-7568
NORA Subject Terms:	Earth Sciences
Date made live:	31 Oct 2019 09:47 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/525726

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1017/S0016756800047592

ISSN:

0016-7568

NORA Subject Terms:

Earth Sciences

Date made live:

31 Oct 2019 09:47 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/525726