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Intrusion of basalt into frozen sediments and generation of Coherent-Margined Volcaniclastic Dikes (CMVDs)

Graettinger, A. H.; Skilling, I. P.; McGarvie, D. and Höskuldsson, A. (2012). Intrusion of basalt into frozen sediments and generation of Coherent-Margined Volcaniclastic Dikes (CMVDs). Journal of Volcanology and Geothermal Research, 217 pp. 30–38.

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Coherent-Margined Volcaniclastic Dikes (CMVDs) are described for the first time from Askja (Dyngjufjöll), Iceland. These dikes display continuous, coherent glassy margins 5 cm thick and have a variety of clastic interiors comprising vitric tephra, pillow and pillow-fragment bearing lapilli tuffs. CMVDs are interpreted to form when basaltic dikes interact with subglacial ice-cemented volcaniclastic sediments. Formation requires chilling of dike margins, drainage of the dike interior and flooding of the cavity by meltwater, followed by non-explosive mingling of magma, clastics and water. Evidence for ice-cementation includes minimal interaction with the host (< 3 mm peperite), local pillowed dike margins and the preservation of continuous glassy coherent margins along the edge of a drained dike cavity. CMVDs should be present at other volcanic centers with ice-cemented sediments, including the Martian cryosphere.

Item Type: Journal Article
Copyright Holders: 2011 Elsevier BV
ISSN: 0377-0273
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetNational Science Foundation
Keywords: Askja; glaciovolcanic; ice-cemented; intrusions; peperite; Iceland
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Item ID: 31471
Depositing User: Dave McGarvie
Date Deposited: 20 Jan 2012 15:47
Last Modified: 26 Feb 2016 13:26
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