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Fish Canyon Tuff

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The Fish Canyon Tuff ignimbrite

The Fish Canyon tuff is the deposit resulting from the single largest explosive eruption ever measured, estimated at 5,000 cubic kilometers.[1] The erution was centered at La Garita Caldera in southwest Colorado. The tuff can be assured as to belonging to one eruption due to its high chemical consistancy (SiO2=bulk 67.5-68.5% (dacite), matrix 75-76% (rhyolite) and consistant 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

  1. ^ Ort, Michael. "Largest explosive eruptions:". Retrieved 14 August 2010.

See also

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