Evidence for a welded tuff in the Rhyolite of Calico Hills

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A welded pyroclastic deposit has been identified in the Rhyolite of Calico Hills near Yucca Mountain, Nevada, where only lava flows and nonwelded pyroclastic deposits were previously described. Field data from Fortymile Wash show that nonwelded, bedded tuff grades upward into partially welded massive ruff, and thence into densely welded vitrophyre. Petrographic data show a progressive decrease in inter- and intragranular porosity and amount of vapor-phase minerals, with increasing welding. Pumice fragments are first deformed, then develop diffuse boundaries which become increasingly obscure with progressive welding. The most densely welded rock is a perlitic vitrophyre. The origin of this welded ... continued below

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9 p.

Creation Information

Dickerson, R.P. & Hunter, W.C. December 31, 1994.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 13 times . More information about this article can be viewed below.

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  • Dickerson, R.P. Science Applications International Corp., Golden, CO (United States)
  • Hunter, W.C. Geological Survey, Denver, CO (United States)

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Description

A welded pyroclastic deposit has been identified in the Rhyolite of Calico Hills near Yucca Mountain, Nevada, where only lava flows and nonwelded pyroclastic deposits were previously described. Field data from Fortymile Wash show that nonwelded, bedded tuff grades upward into partially welded massive ruff, and thence into densely welded vitrophyre. Petrographic data show a progressive decrease in inter- and intragranular porosity and amount of vapor-phase minerals, with increasing welding. Pumice fragments are first deformed, then develop diffuse boundaries which become increasingly obscure with progressive welding. The most densely welded rock is a perlitic vitrophyre. The origin of this welded tuff is not clear, as it could represent an ignimbrite or a tuff fused beneath a thick lava flow.

Physical Description

9 p.

Notes

INIS; OSTI as DE96001466

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  • International high-level radioactive waste management conference, Las Vegas, NV (United States), 22-26 May 1994

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  • Other: DE96001466
  • Report No.: CONF-940553--100
  • Grant Number: AI08-92NV10874
  • Office of Scientific & Technical Information Report Number: 122281
  • Archival Resource Key: ark:/67531/metadc627807

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Creation Date

  • December 31, 1994

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  • June 16, 2015, 7:43 a.m.

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  • April 18, 2016, 6:43 p.m.

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Dickerson, R.P. & Hunter, W.C. Evidence for a welded tuff in the Rhyolite of Calico Hills, article, December 31, 1994; Denver, Colorado. (digital.library.unt.edu/ark:/67531/metadc627807/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.