A unifying lithostratigraphy of late Cretaceous–early Tertiary fore-arc volcanic sequences on Alexander Island, Antarctica

McCarron, Joe J.. 1997 A unifying lithostratigraphy of late Cretaceous–early Tertiary fore-arc volcanic sequences on Alexander Island, Antarctica. Antarctic Science, 9 (2). 209-220. https://doi.org/10.1017/S0954102097000266

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Official URL: http://dx.doi.org/10.1017/S0954102097000266

Abstract/Summary

Late Cretaceous–early Tertiary subduction-related fore-arc volcanic rocks are exposed in a north–south linear belt along the length of Alexander Island. The age and tectonic setting of these rocks is well understood; they are not considered to represent “normal” arc magmas but were generated in the fore-arc as a result of ridge subduction. Due to their distinct composition and mode of formation, they are no longer considered to be genetically related to the Antarctic Peninsula magmatic arc. They are therefore removed from the Antarctic Peninsula Volcanic Group and placed in a newly defined Alexander Island Volcanic Group. The group is made up of the Monteverdi, Staccato, Walton, Colbert, Elgar and Finlandia formations, which vary widely in lithology, facies and age. The Colbert and Elgar formations are subdivided into nine and three members respectively. Type localities, representative lithologies and age of each of the formations are discussed. The Staccato and Colbert Magmatic complexes are defined to include volcanic and plutonic rocks that are considered to be coeval. The Rouen Intrusive complex combines the plutonic rocks from the Rouen Mountains and Rothschild Island on the basis of age and chemistry.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1017/S0954102097000266
Programmes:	BAS Programmes > Pre 2000 programme
ISSN:	0954-1020
Additional Keywords:	Circum-Pacific, fore-arc magmatism
Date made live:	26 Sep 2016 12:37 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/514590

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1017/S0954102097000266

Programmes:

BAS Programmes > Pre 2000 programme

ISSN:

0954-1020

Additional Keywords:

Circum-Pacific, fore-arc magmatism

Date made live:

26 Sep 2016 12:37 +0 (UTC)