Graettinger, A. H.; Skilling, I. P.; McGarvie, D. and Höskuldsson, A.
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|DOI (Digital Object Identifier) Link:||http://doi.org/10.1016/j.jvolgeores.2011.12.008|
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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|
|Project Funding Details:||
|Keywords:||Askja; glaciovolcanic; ice-cemented; intrusions; peperite; Iceland|
|Academic Unit/Department:||Science > Environment, Earth and Ecosystems
|Depositing User:||Dave McGarvie|
|Date Deposited:||20 Jan 2012 15:47|
|Last Modified:||26 Feb 2016 13:26|
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