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Title: Mineralogic variation in drill core UE-25 UZ{number_sign}16, Yucca Mountain, Nevada

Abstract

Quantitative X-ray powder diffraction methods have been used to analyze 108 samples from drill core UE-25 UZ{number_sign}16 at Yucca Mountain, Nevada. This drill hole, located within the imbricate fault zone east of the potential Yucca Mountain repository site, confirms the authors` previous knowledge of gross-scale mineral distributions at Yucca Mountain and provides insight into possible shallow pathways for hydrologic recharge into the potential host rock. Analyses of samples from UE-25 UZ{number_sign}16 have shown that the distribution of major zeolitized horizons, of silica phases, and of glassy tuffs are similar to those noted in nearby drill cores. However, the continuous core and closer sample spacing in UE-25 UZ{number_sign}16 provide a more exact determination of mineral stratigraphy, particularly in hydrologically important units such as the Paintbrush bedded tuffs above the Topopah Spring Tuff and in the upper vitrophyre of the Topopah Spring Tuff. The discovery of matrix zeolitization in the devitrified Topopah Spring Tuff of UE25 UZ{number_sign}16 shows that some unexpected mineralogic features can still be encountered in the exploration of Yucca Mountain and emphasizes the importance of obtaining a more complete three-dimensional model of Yucca Mountain mineralogy.

Authors:
; ; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
28334
Report Number(s):
LA-12810-MS
ON: DE95008371; TRN: 95:008482
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Feb 1995
Country of Publication:
United States
Language:
English
Subject:
05 NUCLEAR FUELS; 54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; YUCCA MOUNTAIN; RADIOACTIVE WASTE FACILITIES; GEOLOGIC FORMATIONS; SITE CHARACTERIZATION; TUFF; MINERALOGY; X-RAY DIFFRACTION; GEOLOGIC MODELS; RADIONUCLIDE MIGRATION; GEOLOGIC FRACTURES; HYDRAULIC CONDUCTIVITY; Yucca Mountain Project

Citation Formats

Chipera, S.J., Vaniman, D.T., Carlos, B.A., and Bish, D.L. Mineralogic variation in drill core UE-25 UZ{number_sign}16, Yucca Mountain, Nevada. United States: N. p., 1995. Web. doi:10.2172/28334.
Chipera, S.J., Vaniman, D.T., Carlos, B.A., & Bish, D.L. Mineralogic variation in drill core UE-25 UZ{number_sign}16, Yucca Mountain, Nevada. United States. doi:10.2172/28334.
Chipera, S.J., Vaniman, D.T., Carlos, B.A., and Bish, D.L. Wed . "Mineralogic variation in drill core UE-25 UZ{number_sign}16, Yucca Mountain, Nevada". United States. doi:10.2172/28334. https://www.osti.gov/servlets/purl/28334.
@article{osti_28334,
title = {Mineralogic variation in drill core UE-25 UZ{number_sign}16, Yucca Mountain, Nevada},
author = {Chipera, S.J. and Vaniman, D.T. and Carlos, B.A. and Bish, D.L.},
abstractNote = {Quantitative X-ray powder diffraction methods have been used to analyze 108 samples from drill core UE-25 UZ{number_sign}16 at Yucca Mountain, Nevada. This drill hole, located within the imbricate fault zone east of the potential Yucca Mountain repository site, confirms the authors` previous knowledge of gross-scale mineral distributions at Yucca Mountain and provides insight into possible shallow pathways for hydrologic recharge into the potential host rock. Analyses of samples from UE-25 UZ{number_sign}16 have shown that the distribution of major zeolitized horizons, of silica phases, and of glassy tuffs are similar to those noted in nearby drill cores. However, the continuous core and closer sample spacing in UE-25 UZ{number_sign}16 provide a more exact determination of mineral stratigraphy, particularly in hydrologically important units such as the Paintbrush bedded tuffs above the Topopah Spring Tuff and in the upper vitrophyre of the Topopah Spring Tuff. The discovery of matrix zeolitization in the devitrified Topopah Spring Tuff of UE25 UZ{number_sign}16 shows that some unexpected mineralogic features can still be encountered in the exploration of Yucca Mountain and emphasizes the importance of obtaining a more complete three-dimensional model of Yucca Mountain mineralogy.},
doi = {10.2172/28334},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 1995},
month = {Wed Feb 01 00:00:00 EST 1995}
}

Technical Report:

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  • Data collected to determine the hydraulic characteristics of rocks penetrated by test holes UE-25 UZ No. 4 and UE-25 UZ No. 5 are presented. These test holes are part of a series of test holes drilled in and near the southwestern part of the Nevada Test Site in an investigation conducted by the US Geological Survey in cooperation with the US Department of Energy. This investigation is part of the Yucca Mountain Project Branch, Hydrologic Investigations Program (formerly Nevada Nuclear Waste Storage Investigations) to determine the suitability of this site for storage of high-level radioactive wastes in an underground minedmore » repository. Data on drilling operations, lithology, coring, and laboratory analyses of hydrologic characteristics of core and cuttings samples are included in this report.« less
  • Borehole UE-25 UZ{number_sign}16 is the first of two boreholes that may be used to determine the subsurface structure at Yucca Mountain by using vertical seismic profiling. This report contains information collected while this borehole was being drilled, logged, and tested from May 27, 1992, to April 22, 1994. It does not contain the vertical seismic profiling data. This report is intended to be used as: (1) a reference for drilling similar boreholes in the same area, (2) a data source on this borehole, and (3) a reference for other information that is available from this borehole. The reference information includesmore » drilling chronology, equipment, parameters, coring methods, penetration rates, completion information, drilling problems, and corrective actions. The data sources include lithology, fracture logs, a list of available borehole logs, and depths at which water was recorded. Other information is listed in an appendix that includes studies done after April 22, 1994.« less
  • 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),more » 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.« less
  • Pumping and injection tests conducted in 1983 and 1984 in boreholes UE-25c {number_sign}1, UE-25c {number_sign}2, and UE-25c {number_sign}3 (the c-holes) at Yucca Mountain, Nevada, were analyzed with respect to information obtained from lithologic and borehole geophysical logs, core permeameter tests, and borehole flow surveys. The three closely spaced c-holes, each of which is about 3,000 feet deep, are completed mainly in nonwelded to densely welded, ash-flow tuff of the tuffs and lavas of Calico Hills and the Crater Flat Tuff of Miocene age. Below the water table, tectonic and cooling fractures pervade the tuffaceous rocks but are distributed mainly inmore » 11 transmissive intervals, many of which also have matrix permeability. Information contained in this report is presented as part of ongoing investigations by the US Geological Survey (USGS) regarding the hydrologic and geologic suitability of Yucca Mountain, Nevada, as a potential site for the storage of high-level nuclear waste in an underground mined geologic repository. This investigation was conducted in cooperation with the US Department of Energy under Interagency Agreement DE-AI08-78ET44802, as part of the Yucca Mountain Site Characterization Project.« less
  • This report is a compilation of data from eight exploratory boreholes drilled to help characterize the geology and hydrology of the unsaturated zone. The eight holes were drilled in Area 25 of the Nevada Test Site and in Bureau of Land Management land adjacent to the Nevada Test Site. Data presented in the hole histories include all locations, daily activities, review of hole conditions, geophysical log lists and microfiche copies of the geophysical logs.