Products of subglacial volcanic eruptions under different ice thicknesses: two examples from Antarctica

Smellie, John L.; Skilling, Ian P.. 1994 Products of subglacial volcanic eruptions under different ice thicknesses: two examples from Antarctica. Sedimentary Geology, 91 (1-4). 115-129. https://doi.org/10.1016/0037-0738(94)90125-2

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Official URL: https://doi.org/10.1016/0037-0738(94)90125-2

Abstract/Summary

Late Cenozoic, subglacially erupted volcanic sequences are scattered throughout the Antarctic Peninsula. Two of the best preserved examples, at Mount Pinafore (Alexander Island; c. 5.5–6 Ma) and Brown Bluff (Graham Land; c. 1 Ma), are complete enough to be regarded as sequence holotypes for this uncommonly preserved eruptive/depositional setting. Despite a common glacial association, the sedimentary lithofacies in the two outcrops suggest flowing and ponded water conditions, respectively, indicating significant differences in the depositional palaeoenvironments. The original ice thicknesses exerted a major control on the lithofacies which resulted from each eruptive phase. At Mount Pinafore, the lithofacies were confined within a steep-sided valley during successive eruptions beneath thin (100–150 m?), wet-based ice. The much thicker succession at Brown Bluff is a tindar-tuya edifice, which formed within a small basin (probably 15 km across) confined by ice 400 m thick.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/0037-0738(94)90125-2
Programmes:	BAS Programmes > Pre 2000 programme
ISSN:	00370738
Date made live:	26 Jul 2017 09:58 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/517381

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1016/0037-0738(94)90125-2

Programmes:

BAS Programmes > Pre 2000 programme

ISSN:

00370738

Date made live:

26 Jul 2017 09:58 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/517381