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{{Short description|Monogenetic volcanic field in Arizona}}File:Hopi Buttes.jpg|thumb|Hopi Buttes, about 30 miles SE of First MesaFirst Mesa(File:Flying Butte Hopi Buttes AZ.jpg|right|thumb|Oblique air photo of Flying Butte, facing approximately south)Hopi Buttes volcanic field is a monogenetic volcanic field located on the Colorado Plateau mostly on the Navajo Reservation around the town of Dilkon in northeastern Arizona north of Holbrook.The volcanic field covers an area of approximately {{convert|965|sqmi}} and contains about 300 maars and diatremes.Geo-Ecological Study of Historic and Prehistoric Land Use in the Hopi Buttes area, Navajo Nation, Arizona, USGSThe erosional exposure of the deposits varies with those in the eastern portion exhibiting the shallowly eroded maar deposits and those in the western portion the more deeply eroded feeder diatremes. The maars result from explosive interaction of the hot diatreme material with the groundwater system and result in a mixture of volcanic tuff material and sediments of the Miocene–Pliocene lacustrine sediments of the Bidahochi Formation. In the western portion of the field the buttes consist of the feeder diatremes of monchiquite and nepheline syenite magmas.Zelawksi, Mallory The Hopi Buttes volcanic field, Northern Arizona University, Flagstaff, AZ, The Arizona Geological Survey, 2010Most of the volcanic activity occurred between 8.5 and 6 million years ago, with the most recent dated at 4.2 million years ago.Volcano World, Coliseum Maar, Hopi Buttes, Arizona {{webarchive|url=https://web.archive.org/web/20080926113910weblink |date=2008-09-26 }}">

Notable vents{| class"wikitable"

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Coliseum MaarCOLISEUM MAAR, HOPI BUTTES, ARIZONA> PUBLISHER =VOLCANO WORLD, NORTH DAKOTA AND OREGON SPACE GRANT CONSORTIA	ACCESSDATE =2007-05-07	ARCHIVEURL =HTTPS://WEB.ARCHIVE.ORG/WEB/20080926113910/HTTP://VOLCANO.OREGONSTATE.EDU/VWDOCS/VOLC_IMAGES/NORTH_AMERICA/COLISEUM_MAAR.HTML				35	N	06	type:mountain	|

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Morale Claim MaarWOOD > FIRST = CHARLES A.

TITLE = VOLCANOES OF NORTH AMERICA

CAMBRIDGE UNIVERSITY PRESS > YEAR = 1993

ISBN = 0-521-43811-X, MORALE CLAIM MAAR, HOPI BUTTES, ARIZONA >PUBLISHER=VOLCANO WORLD, NORTH DAKOTA AND OREGON SPACE GRANT CONSORTIA

ACCESSDATE=2007-05-07

ARCHIVEURL=HTTPS://WEB.ARCHIVE.ORG/WEB/20080926164931/HTTP://VOLCANO.OREGONSTATE.EDU/VWDOCS/VOLC_IMAGES/NORTH_AMERICA/MORALE_CLAIM.HTML

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See also

• List of volcanoes in the United States of America

References

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