Geochemistry of core samples of the Tiva Canyon Tuff from drill hole UE-25 NRG{number_sign}3, Yucca Mountain, Nevada

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The Tiva Canyon Tuff of Miocene age is composed of crystal-poor, high-silica rhyolite overlain by a crystal-rich zone that is gradational in composition from high-silica rhyolite to quartz latite. Each of these zones is divided into subzones that have distinctive physical, mineralogical, and geochemical features.Accurate identification of these subzones and their contacts is essential for detailed mapping and correlation both at the surface and in the subsurface in drill holes and in the exploratory studies facility (ESF). This report presents analyses of potassium (K), calcium (Ca), titanium (Ti), rubidium (Rb), strontium (Sr), yttrium (Y), zirconium (Zr), niobium (Nb), barium (Ba), ... continued below

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23 p.

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Peterman, Z.E. & Futa, K. July 1, 1996.

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Description

The Tiva Canyon Tuff of Miocene age is composed of crystal-poor, high-silica rhyolite overlain by a crystal-rich zone that is gradational in composition from high-silica rhyolite to quartz latite. Each of these zones is divided into subzones that have distinctive physical, mineralogical, and geochemical features.Accurate identification of these subzones and their contacts is essential for detailed mapping and correlation both at the surface and in the subsurface in drill holes and in the exploratory studies facility (ESF). This report presents analyses of potassium (K), calcium (Ca), titanium (Ti), rubidium (Rb), strontium (Sr), yttrium (Y), zirconium (Zr), niobium (Nb), barium (Ba), lanthanum (La), and cerium (Ce) in core samples of the Tiva Canyon Tuff from drill hole UE-25 NRG {number_sign}3. The concentrations of most of these elements are remarkably constant throughout the high-silica rhyolite, but at its upper contact with the crystal-rich zone, Ti, Zr, Ba, Ca, Sr, La, Ce, and K begin to increase progressively through the crystal-rich zone. In contrast, Rb and Nb decrease, and Y remains essentially constant. Initial {sup 87}Sr/{sup 86}Sr ratios are relatively uniform in the high-silica rhyolite with a mean value of 0.7117, whereas initial {sup 87}Sr/{sup 86}Sr ratios decrease upward in the quartz latite to values as low as 0.7090.

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23 p.

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INIS; OSTI as DE96013036

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  • Other Information: PBD: 1996

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  • Other: DE96013036
  • Report No.: USGS-OFR--95-325
  • Grant Number: AI08-92NV10874
  • DOI: 10.2172/266700 | External Link
  • Office of Scientific & Technical Information Report Number: 266700
  • Archival Resource Key: ark:/67531/metadc671561

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  • July 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • April 18, 2016, 6:44 p.m.

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Peterman, Z.E. & Futa, K. Geochemistry of core samples of the Tiva Canyon Tuff from drill hole UE-25 NRG{number_sign}3, Yucca Mountain, Nevada, report, July 1, 1996; Denver, Colorado. (digital.library.unt.edu/ark:/67531/metadc671561/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.