Fluid inclusion studies of calcite veins from Yucca Mountain, Nevada, Tuffs: Environment of formation

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Calcite vein and vug fillings at four depths (130-314m), all above the present water table in USW G-1 bore hole at Yucca Mountain, Nevada, contain primary fluid inclusions with variable vapor/liquid raitos: Most of these inclusions are either full of liquid or full of vapor. The liquid-filled inclusions show that most of the host calcite crystallized from fluids at <100{degrees}C. The vapor-filled inclusions provide evidence that a separate vapor phase was present in the fluid during crystallization. Studies of these vapor-filled inclusions on the microscope crushing stage were interpreted in an earlier paper as indicating trapping of an air-water-CO{sub 2} ... continued below

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4 p.

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Roedder, E.; Whelan, J.F. & Vaniman, D.T. December 31, 1994.

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Calcite vein and vug fillings at four depths (130-314m), all above the present water table in USW G-1 bore hole at Yucca Mountain, Nevada, contain primary fluid inclusions with variable vapor/liquid raitos: Most of these inclusions are either full of liquid or full of vapor. The liquid-filled inclusions show that most of the host calcite crystallized from fluids at <100{degrees}C. The vapor-filled inclusions provide evidence that a separate vapor phase was present in the fluid during crystallization. Studies of these vapor-filled inclusions on the microscope crushing stage were interpreted in an earlier paper as indicating trapping of an air-water-CO{sub 2} vapor phase at ``<100{degrees}C``. Our new studies reveal the additional presence of major methane in the vapor-filled inclusion, indicating even lower temperatures of trapping, perhaps at near-surface temperatures. They also show that the host calcite crystals grew from a flowing film of water on the walls of fractures open to the atmosphere, the vapor-filled inclusions representing bubbles that exsolved from this film onto the crystal surface.

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4 p.

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INIS; OSTI as DE96001461

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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: DE96001461
  • Report No.: CONF-940553--95
  • Grant Number: AI08-92NV10874
  • Office of Scientific & Technical Information Report Number: 113821
  • Archival Resource Key: ark:/67531/metadc619787

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  • 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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Roedder, E.; Whelan, J.F. & Vaniman, D.T. Fluid inclusion studies of calcite veins from Yucca Mountain, Nevada, Tuffs: Environment of formation, article, December 31, 1994; Denver, Colorado. (digital.library.unt.edu/ark:/67531/metadc619787/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.