Model for the intrusion of batholiths associated with the eruption of large-volume ash-flow tuffs

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Authors:Whitney, James A.; Stormer, John C., Jr.
Author Affiliations:Primary:
Univ. Ga., Dep. Geol., Athens, GA, United States
Rice Univ., United States
Volume Title:Science
Source:Science, 231(4737), p.483-485. Publisher: American Association for the Advancement of Science, Washington, DC, United States. ISSN: 0036-8075
Publication Date:1986
Note:In English. 14 refs.; illus.
Summary:The model for batholith formation follows the sequence: 1) granitic magma, with density less than its overburden, coalesces at a depth of 20-30 km and begins to rise into ring-dykes; 2) shallow magma vesiculates and erupts while kilometre-sized overburden blocks sink into the magma at rates perhaps >10 m/s; 3) continued eruption of low-density magma permits caldera subsidence, bringing down with it already deposited volcaniclastics; and 4) resurgence of deep magma permits the continued eruption and formation of shallow- depth magma chambers in the brittle zone of the overlying crust. The implications of this model include lack of shallow warning events preceding major ashflow eruptions; possible lack of large, continuous shallow magmatic reservoirs for hydrothermal power projects; and deeper and more enduring hydrothermal circulation during ore formation. [K.F.]
Subjects:Ash-flow tuff; Batholiths; Calderas; Collapse structures; Density; Emplacement; Eruptions; Igneous rocks; Intrusions; Magma chambers; Magmas; Mechanism; Pressure; Properties; Pyroclastics; Theoretical studies; Volcanic features; Volcanic rocks; Volcanism; Volcanology; Volume
Abstract Numbers:86M/5077
Record ID:1986034818
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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