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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 965 square miles (2,500 km2) and contains about 300 maars and diatremes. Most of the volcanic activity occurred between 8.5 and 6 million years ago, with the most recent dated at 4.2 million years ago.

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  • Das Hopi-Buttes-Volcanic-Field ist ein monogenetisches Vulkanfeld im Nordosten des US-amerikanischen Bundesstaats Arizona. Es liegt etwa 50 bis 80 Kilometer nordöstlich von Winslow in 1650 bis 2080 Meter Höhe und hat einen Durchmesser von etwa 60 Kilometer. In einem 2500 Quadratkilometer großen Gebiet befinden sich hier rund 300 Maare und Diatreme. Der Hauptteil der phreatomagmatischen Tätigkeit fand im Miozän, im Zeitraum 8,5 bis 6,0 Millionen Jahre BP statt (Tortonium bis Messinium), die letzten Explosionen ereigneten sich im Pliozän vor etwa 4,2 Millionen Jahren (Zancleum). (de)
  • 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 965 square miles (2,500 km2) and contains about 300 maars and diatremes. The 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. Most of the volcanic activity occurred between 8.5 and 6 million years ago, with the most recent dated at 4.2 million years ago. (en)
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  • Das Hopi-Buttes-Volcanic-Field ist ein monogenetisches Vulkanfeld im Nordosten des US-amerikanischen Bundesstaats Arizona. Es liegt etwa 50 bis 80 Kilometer nordöstlich von Winslow in 1650 bis 2080 Meter Höhe und hat einen Durchmesser von etwa 60 Kilometer. In einem 2500 Quadratkilometer großen Gebiet befinden sich hier rund 300 Maare und Diatreme. Der Hauptteil der phreatomagmatischen Tätigkeit fand im Miozän, im Zeitraum 8,5 bis 6,0 Millionen Jahre BP statt (Tortonium bis Messinium), die letzten Explosionen ereigneten sich im Pliozän vor etwa 4,2 Millionen Jahren (Zancleum). (de)
  • 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 965 square miles (2,500 km2) and contains about 300 maars and diatremes. Most of the volcanic activity occurred between 8.5 and 6 million years ago, with the most recent dated at 4.2 million years ago. (en)
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  • Hopi-Buttes-Volcanic-Field (de)
  • Hopi Buttes volcanic field (en)
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