Graettinger, A. H.; Skilling, I. P.; McGarvie, D. and Höskuldsson, A.
(2012).
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| DOI (Digital Object Identifier) Link: | http://dx.doi.org/doi:10.1016/j.jvolgeores.2011.12.008 |
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Abstract
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 |
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| Copyright Holders: | 2011 Elsevier BV |
| ISSN: | 0377-0273 |
| Funders: | National 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: | 27 Oct 2012 17:15 |
| URI: | http://oro.open.ac.uk/id/eprint/31471 |
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