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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. 10.1016/0037-0738(94)90125-2

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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): 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: http://nora.nerc.ac.uk/id/eprint/517381

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