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Potentially active volcanoes of Peru - Observations using Landsat Thematic Mapper and Space Shuttle imageryA synoptic study of the volcanoes of southern Peru (14-17 deg S), the northernmost part of the Central Volcanic Zone (CVZ 14-28 deg S) of the Andes, was conducted on the basis of Landsat TM images and color photography. The volcanoes were classified and their relative ages determined using subtle glacial-morphological features. Eight of them were postulated as potentially active. These are located in a narrow volcanic zone which probably reflects a steep dip of the Nazca plate through the zone of magma generation. The break in the trend of the volcanic arc possibly reflects the complexity of the crustal stress field above a major segment boundary in the subducting plate. There are also fields of mafic monogenetic centers in this region. In comparison with the southern part of the CVZ, the general paucity of older volcanic edifices north of 17 deg S suggested a more recent onset of volcanism, a possible result of the oblique subduction of the Nazca ridge and the consequent northward migration of its intersection with the Peru-Chile trench. This, together with the lack of any large silicic caldera systems and youthful dacite domes, suggested that there are real differences in the volcanic evolution of the two parts of the CVZ.
Document ID
19900062008
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
De Silva, S. L.
(Lunar and Planetary Inst. Houston, TX, United States)
Francis, P. W.
(Lunar and Planetary Institute Houston, TX, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Publication Information
Publication: Bulletin of Volcanology
Volume: 52
ISSN: 0258-8988
Subject Category
Geophysics
Accession Number
90A49063
Funding Number(s)
CONTRACT_GRANT: NAGW-1167
CONTRACT_GRANT: NASW-4066
Distribution Limits
Public
Copyright
Other

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