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

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

Coherent-Margined Volcaniclastic Dikes (CMVDs) are described for the first time from Askja (Dyngjufjöll), Iceland. These dikes display continuous, coherent glassy margins 5cm thick and have a variety of clastic interiors comprising vitric tephra, pillow and pillow-fragment bearing lapilli tuffs. CMV...

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Veröffentlicht in:Journal of volcanology and geothermal research 2012-03, Vol.217-218, p.30-38
Hauptverfasser: Graettinger, A.H., Skilling, I.P., McGarvie, D., Höskuldsson, Á.
Format: Artikel
Sprache:eng
Schlagworte:
Askja
Coherence
Cooling
Cryospheres
Crystalline rocks
Dikes
Drainage
Earth sciences
Earth, ocean, space
Exact sciences and technology
Glaciovolcanic
Glassy
Holes
Ice-cemented
Iceland
Igneous and metamorphic rocks petrology, volcanic processes, magmas
Intrusions
Peperite
Sediments
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Zusammenfassung:Coherent-Margined Volcaniclastic Dikes (CMVDs) are described for the first time from Askja (Dyngjufjöll), Iceland. These dikes display continuous, coherent glassy margins 5cm 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 (
ISSN:0377-0273
1872-6097
DOI:10.1016/j.jvolgeores.2011.12.008