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buffered and unbuffered dike emplacement on earth and venus - implications for magma reservoir size, depth, and rate of magma replenishmentModels of the emplacement of lateral dikes from magma chambers under constant (buffered) driving pressure conditions and declining (unbuffered) driving pressure conditions indicate that the two pressure scenarios lead to distinctly different styles of dike emplacement. In the unbuffered case, the lengths and widths of laterally emplaced dikes will be severely limited and the dike lengths will be highly dependent on chamber size; this dependence suggests that average dike length can be used to infer the dimensions of the source magma reservoir. On Earth, the characteristics of many mafic-dike swarms suggest that they were emplaced in buffered conditions (e.g., the Mackenzie dike swarm in Canada and some dikes within the Scottish Tertiary). On Venus, the distinctive radial fractures and graben surrounding circular to oval features and edifices on many size scales and extending for hundreds to over a thousand km are candidates for dike emplacement in buffered conditions.
Document ID
19930072214
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Parfitt, E. A.
(NASA Headquarters Washington, DC United States)
Head, J. W., III
(Brown Univ. Providence, RI, United States)
Date Acquired
August 16, 2013
Publication Date
June 1, 1993
Publication Information
Publication: Earth, Moon, and Planets
Volume: 61
Issue: 3
ISSN: 0167-9295
Subject Category
LUNAR AND PLANETARY EXPLORATION
Funding Number(s)
CONTRACT_GRANT: NAGW-1873
Distribution Limits
Public
Copyright
Other