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Ignimbrites of Amazonis Planitia region of MarsThe terms ignimbrite and ash flow tuff are used to describe relatively thin but extensive sheets of material interpreted to be of pyroclastic origin and to consist of volcanic ash or pumice fragments. Criteria for distinguishing ignimbrites from other geologic materials are considered, and characteristics observed for rock units interpreted as ignimbrites in Amazonis Planitia are discussed. A series of rock units which are thought to represent ignimbrites have been mapped along an east-west border zone between the highland plateau and lowland plains of Amazonis Planitia. The area is roughly bounded by a triangle whose apices are the volcanoes Apollinaris Patera, Biblis Patera, and Olympus Mons. Attention is given to aspects of general geology, morphology and stratigraphy, and thickness and volume estimates. Correlations with other data are considered and some theoretical aspects of Martian ignimbrite emplacement are discussed.
Document ID
19820040287
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Scott, D. H.
(Geological Survey Flagstaff, AZ, United States)
Tanaka, K. L.
(U.S. Geological Survey Flagstaff, AZ, United States)
Date Acquired
August 10, 2013
Publication Date
February 10, 1982
Publication Information
Publication: Journal of Geophysical Research
Volume: 87
Subject Category
Lunar And Planetary Exploration
Accession Number
82A23822
Funding Number(s)
CONTRACT_GRANT: NASA ORDER W-13709
Distribution Limits
Public
Copyright
Other

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