Melt dynamics of a layered mantle plume source
Article Abstract:
The supply rates of basaltic magma to volcanoes restrict the flow rates within their mantle sources. Layered source regions consisting of alternating layers of melt and residuum have permeabilities that are orders of magnitude larger than percolative sources. Relevant supply rates for Hawaiian volcanoes are obtained for source permeabilities within the range 10-4 to 10-2 square centimeters. The results are within the range for layered sources, suggesting that a layered source is a physically viable model for Hawaiian plume sources.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1998
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Nature of a flood-basalt-magma reservoir based on the compositional variation in a single flood-basalt flow and its feeder dike in the Mesozoic Hartford Basin, Connecticut
Article Abstract:
The Holyoke basalt, thickest of the three flood-basalts in the Hartford Mesozoic basin of Connecticut, was fed by the Buttress dike, which, as a result of tilting and faulting, is exposed to depths of up to 8 km beneath the Mesozoic land surface. Whole rock analyses through the distal and proximal parts of the basalt and its feeder dike provide a picture of chemical variability within a single batch of magma that arose from a mid-crustal reservoir during the extension associated with the breakup of Pangea.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1998
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Constraints on the formation of cyclic units in ultramafic zones of large basaltic chambers
Article Abstract:
Simple physical constraints in the multiple reinjection model are developed. Given the petrological data of ultramafic zone, the reinjected thickensses are calculated as a function of the reinjected magma density. Consequently, two different models of multiple reinjections for the formation of the entire Ultramafic Series of the Stillwater are examined. All these models require specific densities, and that the reinjected liquids evolve chemically and produced in variable volumes.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1992
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