Search Results

Advanced search parameters have been applied.
open access

Underground Research Laboratories for Crystalline Rock and Sedimentary Rock in Japan

Description: The Japan Nuclear Cycle Development Institute (JNC) has started two off-site (generic) underground research laboratory (URL) projects, one for crystalline rock as a fractured media and the other for sedimentary rock as a porous media. This paper introduces an overview and current status of these projects.
Date: February 27, 2003
Creator: Shigeta, N.; Takeda, S.; Matsui, H. & Yamasaki, S.
Partner: UNT Libraries Government Documents Department
open access

Research on the physical properties of geothermal reservoir rock. Annual report, September 1, 1977

Description: Measurements have been made of the electrical resistivity, the acoustic wave speed, density, and water content of six groups of rock samples taken from Cenozoic volcanic units. It has been found from these measurements that the correlations between physical properties are significantly different in the case of volcanic rocks than in the case of sandstones and limestones. For a given porosity and water content, the resistivity of a volcanic rock is several fold greater than that of a sandstone o… more
Date: September 25, 1977
Creator: Keller, G.V.; Grose, L.T. & Pickett, G.R.
Partner: UNT Libraries Government Documents Department
open access

A Preliminary Report on the Precambrian Iron Deposits Near Atlantic City, Wyoming

Description: A report about 100 square miles of metamorphosed Precambrian sedimentary and volcanic rocks in Wyoming. The district in which they are located is known for its gold, but iron deposits of high economic potential are being developed in the northwest part.
Date: 1963
Creator: Bayley, Richard W.
Partner: UNT Libraries Government Documents Department
open access

A comparative simulation study of coupled THM processes and their effect on fractured rock permeability around nuclear waste repositories

Description: This paper presents an international, multiple-code, simulation study of coupled thermal, hydrological, and mechanical (THM) processes and their effect on permeability and fluid flow in fractured rock around heated underground nuclear waste emplacement drifts. Simulations were conducted considering two types of repository settings: (a) open emplacement drifts in relatively shallow unsaturated volcanic rock, and (b) backfilled emplacement drifts in deeper saturated crystalline rock. The results … more
Date: October 23, 2008
Creator: Rutqvist, Jonny; Barr, Deborah; Birkholzer, Jens T.; Fujisaki, Kiyoshi; Kolditz, Olf; Liu, Quan-Shen et al.
Partner: UNT Libraries Government Documents Department
open access

Drilling rate changes when air drilling is switched to mist drilling. [Claystone]

Description: Eight shallow (30-foot-deep) holes were drilled in four formations to determine if the reduction in penetration rate that usually occurs when air drilling is changed to mist drilling might be due to the physical action of drilling a wet, soapy rock. The results showed an average loss of 9.3%, with the greatest loss occurring in limestone. The softest formation (claystone) showed only a 1.2% reduction in penetration rate; the two sandstones averaged 10.0-percent loss; and the limestone showed a … more
Date: August 1, 1977
Creator: Williams, C. R.
Partner: UNT Libraries Government Documents Department
open access

Selected Annotated Bibliography of the Uranium Geology of Igneous and Metamorphic Rocks in the United States and Territories

Description: "This bibliography is an annotated list of selected reports that were publicly available as of May 31, 1956, pertaining to the uranium content and/or radioactivity of igneous and metamorphic rocks and minerals in the United States, Alaska, and Hawaii."
Date: July 1956
Creator: Curtis, Diane
Partner: UNT Libraries Government Documents Department
open access

Mechanical and transport properties of rocks at high temperatures and pressures. Task I, the physical nature of fracturing at depth. Technical progress report No. 1, 1 March 1980-30 November 1980

Description: Research progress is reported in the following areas: (1) the delineation of the boundary separating elastic-brittle and transient-1 semibrittle behavior of granite and of its volcanic and metamorphic equivalents, rhyolite and granite gneiss; (2) the variation of fracture permeability in Sioux Quartzite, Westerly Granite and a fine-1 grained gabbro as a function of effective pressure and hydrothermal alterations; and (3) determine the mechanical properties of selected rocks at high temperatures… more
Date: December 15, 1980
Creator: Carter, N. L.
Partner: UNT Libraries Government Documents Department
open access

Values for conductive heat transfer in geothermal technologies

Description: Thermal conductivity and diffusivity of the subsurface are evaluated as critical parameters in the application of certain geothermal technologies. The variability of these parameters as a function of other subsurface properties is investigated. A simple method of estimating thermal conductivity and diffusivity from available information at specific locations is explained, and an interactive computer program that has been developed to assist in this task is described.
Date: January 1, 1983
Creator: Intemann, P.R. & Sharp, R.D.
Partner: UNT Libraries Government Documents Department
open access

Selected Annotated Bibliography of the Uranium Geology of Igneous and Metamorphic Rocks in the United States and Territories

Description: From introduction: This bibliography is an annotated list of selected reports that were publicly available as of May 31, 1956, pertaining to the uranium content and/or radioactivity of igneous and metamorphic rocks and minerals in the United States.
Date: July 1956
Creator: Curtis, Diane
Partner: UNT Libraries Government Documents Department
open access

Lead-Alpha Age Determinations of Granitic Rocks from Alaska

Description: Abstract: "Lead-alpha activity age determinations were made on zircon from seven granitic rocks of central and southeastern Alaska. The results of the age determinations indicate two periods of igneous intrusion, one about 95 million years ago, during the Cretaceous period, and another about 53 million years ago, during the early part of the Tertiary. The individual ages determined on zircon from 2 rocks from southeastern Alaska and 1 from east-central Alaska gave results of 90, 100, and 96 mil… more
Date: March 1957
Creator: Matzo, J. J.; Jaffe, H. W. & Waring, C. L.
Partner: UNT Libraries Government Documents Department
open access

The Ancient Volcanic Rocks of South Mountain, Pennsylvania

Description: From introduction: In December, 1892, as the result of field work on the part of Dr. G. H. Williams in the northern and of the writer in the southern portion of South Mountain, there appeared a preliminary description of two of the rock types, in which their identification as ancient volcanics was announced. In this bulletin it is proposed to substantiate that identification with more detailed proof. It is further proposed to show that these ancient igneous rocks were, at the time of their cons… more
Date: 1896
Creator: Bascom, Florence
Partner: UNT Libraries Government Documents Department
open access

Mafic and Ultramafic Xenoliths from Volcanic Rocks of the Western United States

Description: From abstract: Mafic and ultramafic xenoliths in the Western United States are present in volcanic rocks ranging from lamprophyric to dacitic in composition and are found in every major tectonic province from the Coast ranges from California to the Great Plains. Xenoliths from 68 localities are described here, but new localities are being discovered, and much remain to be learned about their distribution with respect to the tectonic and geophysical framework of the Western United States.
Date: 1988
Creator: Wilshire, Howard Gordon; Meyer, C. E.; Nakata, John K.; Calk, L. C.; Shervais, John W.; Nielson, J. E. et al.
Location: None
Partner: UNT Libraries Government Documents Department
open access

Quantitative laser-induced breakdown spectroscopy data using peak area step-wise regression analysis: an alternative method for interpretation of Mars science laboratory results

Description: The ChemCam instrument on the Mars Science Laboratory (MSL) will include a laser-induced breakdown spectrometer (LIBS) to quantify major and minor elemental compositions. The traditional analytical chemistry approach to calibration curves for these data regresses a single diagnostic peak area against concentration for each element. This approach contrasts with a new multivariate method in which elemental concentrations are predicted by step-wise multiple regression analysis based on areas of a … more
Date: January 1, 2008
Creator: Clegg, Samuel M; Barefield, James E; Wiens, Roger C; Dyar, Melinda D; Schafer, Martha W & Tucker, Jonathan M
Partner: UNT Libraries Government Documents Department
open access

Weight losses of marble and limestone briquettes exposed to outdoor environments in the eastern United States

Description: Gravimetric changes in marble and limestone briquettes exposed to outdoor environment at five sites in the eastern United States have been monitored since 1984. An earlier report describes procedures and results obtained in 1984--1988. This report presents the results of the exposure period 1984--1988 and reviews and summarizes those of prior years. A linear relationship was found between cumulative gravimetric losses and exposure period or rain depth. These losses resulted in an average recess… more
Date: September 1, 1991
Creator: Reimann, K.J.
Partner: UNT Libraries Government Documents Department
open access

Origin of a sanidine-coesite grospydite

Description: A grospydite xenolith from the Roberts Victor kimberlite pipe in South Africa presents an unusual phase assemblage of clinopyroxene, garnet, kyanite, coesite, and sanidine. The rock as previously described (Smyth and Hatton, 1977) consists of 50% omphocitic clinopyroxene, 28% garnet (Gr/sub 50/Py/sub 28/Alm/sub 22/), 9% kyanite, 65 coesite, and 1% sanidine (Or/sub 99/). Assuming the addition of three additional compatible phases (phlogopite, enstatite, and H/sub 2/O vapor) and a simplified chem… more
Date: January 1, 1982
Creator: Wohletz, K.H. & Smyth, J.R.
Partner: UNT Libraries Government Documents Department
open access

Coupled hydro-mechanical processes in crytalline rock and ininduratedand plastic clays: A comparative discussion

Description: This paper provides a comparative discussion of coupledhydromechanical processes in three different geological formations:crystalline rock, plastic clay, and indurated clay. First, the importantprocesses and associated property characteristics in the three rock typesare discussed. Then, one particular hydromechanical coupling is broughtup for detailed consideration, that of pore pressure changes in nearbyrock during tunnel excavation. Three field experiments in the three rocktypes are presented… more
Date: February 15, 2006
Creator: Tsang, Chin-Fu; Blumling, Peter & Bernier, Frederic
Partner: UNT Libraries Government Documents Department
open access

Chemical alteration of limestone and marble samples exposed to acid rain and weathering in the eastern United States, 1984--1988

Description: In a long-term program that began in 1984, limestone and marble briquettes have been exposed to both anthropogenic acid deposition and natural weathering of four field sites in the eastern United States. Similar tests began at an Ohio site in 1986. Effects of exposure on the briquettes and other materials at the sites are evaluated periodically by several federal agencies cooperating in the National Acid Precipitation Assessment Program (NAPAP). A primary contribution of Argonne National Labora… more
Date: June 1, 1991
Creator: Reimann, K.J.
Partner: UNT Libraries Government Documents Department
open access

Tests pits for calibrating well logging equipment in fractured hard-rock environment

Description: The calibration facility consists of three pits containing fine-grained granite, coarse-grained granite, and medium-grained metamorphosed granodiorite. Each pit contains large quarried blocks of rock that are 8 ft octagons and form a 20 ft stack. The blocks are saturated with water and sealed in watertight fiberglass containers that are recessed so that the top of the upper block is approximately level with the ground. The blocks contain simulated fractures that are formed by the joints between… more
Date: January 1, 1985
Creator: Mathews, M. A.; Scott, J. H. & LaDelfe, C. M.
Partner: UNT Libraries Government Documents Department
open access

Effects of water-saturation on strength and ductility of three igneous rocks at effective pressures to 50 MPa and temperatures to partial melting

Description: Instantaneous-failure strengths and ductilities of water-saturated cylindrical specimens of Charcoal Granodiorite, Mount Hood Andesite, and Cuerbio Basalt are determined at a strain rate of 10{sup -4}s{sup -1} and at effective confining pressures (Pe) of 0 and 50 MPa and at temperatures to partial melting. The data indicate: (1) at Pe = 0 and 50 MPa (Pc and Pp of 50 MPa and of 100 and 50 MPa, respectively) the granodiorite does not water-weaken; (2) at these same Pe the more porous and finer-gr… more
Date: January 1, 1981
Creator: Bauer, S. J.; Friedman, M. & Handin, J.
Partner: UNT Libraries Government Documents Department
open access

Stable Isotope Variations in Banded Iron Formations

Description: In spite of the significant amount of work already reported in the scientific literature, many aspects of the origin of Banded Iron Formations (BIF) remain enigmatic. The authors demonstrate that mineralogic microbanding in BIF is accompanied by autocorrelated isotopic microbanding of organic carbon and carbonate carbon and oxygen. They propose that these isotopic patterns formed as a result of episodic mixing of waters in the depositional environment of BIF.
Date: March 18, 1991
Creator: Abrajano, T. A., Jr. & Holt, B. D.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen