Fish Canyon Tuff: Difference between revisions
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[[File:WheelerGACO.jpg|thumb|The Fish Canyon Eruption ignimbrite]] |
[[File:WheelerGACO.jpg|thumb|The Fish Canyon Eruption ignimbrite]] |
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The '''Fish Canyon Eruption''' was the |
The '''Fish Canyon Eruption''' was the largest known volcanic eruption on Earth, estimated at 5,000 cubic kilometers.<ref>{{cite web|last=Ort|first=Michael|title=Largest explosive eruptions:|url=http://staff.aist.go.jp/s-takarada/CEV/newsletter/lagarita.html|accessdate=14 August 2010}}</ref> The eruption was centered at [[La Garita Caldera]] in southwest [[Colorado]]. The tuff can be assured to belong to one eruption due to its high chemical consistency (SiO<sub>2</sub>=bulk 67.5-68.5% ([[dacite]]), matrix 75-76% ([[rhyolite]]) and consistent [[phenocryst]] content (35-50%) and composition ([[plagioclase]], [[sanidine]], [[quartz]], [[biotite]], [[hornblende]], [[sphene]], [[apatite]], [[zircon]], Fe-Ti [[oxide]]s are the primary phenocrysts). This tuff and eruption is part of the larger [[San Juan volcanic field]] and [[Mid-Tertiary ignimbrite flare-up]]. |
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==References== |
==References== |
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Revision as of 21:42, 28 February 2011
The Fish Canyon Eruption was the largest known volcanic eruption on Earth, estimated at 5,000 cubic kilometers.[1] The eruption was centered at La Garita Caldera in southwest Colorado. The tuff can be assured to belong to one eruption due to its high chemical consistency (SiO2=bulk 67.5-68.5% (dacite), matrix 75-76% (rhyolite) and consistent phenocryst content (35-50%) and composition (plagioclase, sanidine, quartz, biotite, hornblende, sphene, apatite, zircon, Fe-Ti oxides are the primary phenocrysts). This tuff and eruption is part of the larger San Juan volcanic field and Mid-Tertiary ignimbrite flare-up.
References
- ^ Ort, Michael. "Largest explosive eruptions:". Retrieved 14 August 2010.