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Factors controlling the structures of magma chambers in basaltic volcanoesThe depths, vertical extents, and lateral extents of magma chambers and their formation are discussed. The depth to the center of a magma chamber is most probably determined by the density structure of the lithosphere; this process is explained. It is commonly assumed that magma chambers grow until the stress on the roof, floor, and side-wall boundaries exceed the strength of the wall rocks. Attempts to grow further lead to dike propagation events which reduce the stresses below the critical values of rock failure. The tensile or compressive failure of the walls is discussed with respect to magma migration. The later growth of magma chambers is accomplished by lateral dike injection into the country rocks. The factors controlling the patterns of growth and cooling of such dikes are briefly mentioned.
Document ID
19920001739
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Wilson, L.
(Lancaster Univ. (England). Providence, RI., United States)
Head, James W.
(Brown Univ.)
Date Acquired
September 6, 2013
Publication Date
June 1, 1991
Publication Information
Publication: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990
Subject Category
Geophysics
Accession Number
92N10957
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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