Mid-Tertiary ignimbrite flare-up

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Mid-Tertiary ignimbrite flare-up
Wheeler Geologic Area, rocks of the San Luis Caldera complex
VolcanoMultiple cumulative events
Date25-40 million years ago
LocationWestern United States
ImpactDeposited vast swatches of ignimbrite across the western United States

The Mid-Tertiary ignimbrite flare-up,

volcanic eruptions in mid-Cenozoic time, approximately 25–40 million years ago, centered in the western United States.[2] These eruptions are seen today as deposits of ignimbrite, the pyroclastic
material that was laid down from these eruptions.

Overview

There were numerous eruptions within the flare-up. The total volume includes 5x105 km3 of ash flow tuff and 5x106 km3 of intermediate and silicic lava.

Fish Canyon tuff in southwest Colorado. Its volume alone is 5,000 km3. The three primary volcanic centers of the flare-up are the Central Nevada volcanic field of central Nevada, Indian Peak volcanic field of eastern Nevada/western Utah, and the San Juan volcanic field in Colorado
.

Cause

The primary

slab rollback,[5] slab windows,[6] or buckling of the plate,[7]
can explain specific volcanic trends within the flare-up.

See also

Notes

  1. ^ This designation has as a part of it a term, 'Tertiary', that is now discouraged as a formal geochronological unit by the International Commission on Stratigraphy.[1]

References

  1. ISBN 0-521-78142-6
    .
  2. ^ Cannon, Eric. "The Mid-Tertiary ignimbrite flare-up". Archived from the original on 16 July 2012. Retrieved 14 August 2010.
  3. ^ Cannon, Eric. "1. Introduction: The Mid-Tertiary ignimbrite flare-up". Archived from the original on 25 September 2012. Retrieved 14 August 2010.
  4. ^ Cannon, Eric. "5. Tectonics: The Mid-Tertiary ignimbrite flare-up". Archived from the original on 4 March 2016. Retrieved 14 August 2010.
  5. doi:10.1130/GES01285.1
    .
  6. doi:10.1130/0091-7613(2003)031<0351:GCOTKF>2.0.CO;2
    .
  7. doi:10.1130/0091-7613(1995)023<0987:PLROTF>2.3.CO;2
    .
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