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SEM analysis of rock varnish chemistry: A geomorphic age discriminator

Description: Rock varnish, a manganese- and iron-rich coating commonly found on rock surfaces in arid and semiarid regions, has long been of interest as a potential age indicator. Rock varnish has been shown to be an effective medium for dating of geomorphic surfaces over a time range of several thousand to over a million years, utilizing a ratio among minor cations ((K + Ca)/Ti) for the total volume of rock varnish. We have recently, developed a technique using the scanning electron microscope (SEM) equipp… more
Date: July 1, 1989
Creator: Harrington, C.D. & Raymond, R. Jr.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Compilation of elemental concentration data for the United States geological survey's six geochemical exploration reference materials

Description: Elemental composition data on USGS GXR1 ..-->.. GXR6 have been collected and summarized from 13 journal papers and reports. Data from one report concerning the influence of rock dissolution method on subsequent atomic absorption analysis are summarized for aluminium, silver, calcium, iron, and manganese.
Date: August 1, 1980
Creator: Gladney, Ernest S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Acquisition and preparation of specimens of rock for large-scale testing

Description: The techniques used for acquisition and preparation of large specimens of rock for laboratory testing depend upon the location of the specimen, the type of rock and the equipment available at the sampling site. Examples are presented to illustrate sampling and preparation techniques used for two large cylindrical samples of granitic material, one pervasively fractured and one containing a single fracture.
Date: February 1, 1981
Creator: Watkins, D.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Seabed disposal program: sorption and other geochemical and sedimentological studies of mid-plate, mid-gyre deep-sea sediments

Description: Studies of Eu sorption from 0.68M NaCl solution at 15/sup 0/C by typical deep-sea sediments show less than an order-of-magnitude variation between partition coefficients (Kp) for calcareous oozes, red clays and siliceous oozes. Similarly, the concentration (C) dependence of Kp is comparable for all sediments (d log Kp/d C lies between -0.8 and -1.0 ml g/sup -1/M/sup -1/). Sorption and desorption reactions are rapid and yield similar Kp's, suggesting that the process is primarily ion exchange. M… more
Date: July 1, 1977
Creator: Heath, G R
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Use of NURE regional geochemical data in geologic mapping

Description: The objective of this paper is to point out the copious regional geochemical data available through the U.S. DOE National Uranium Resource Evaluation (NURE) Program and to demonstrate the potential of such data as a tool for geologic mapping in the southeastern piedmont. The data presented cover the Charlotte NTMS quadrangle. 6 figures.
Date: January 1, 1978
Creator: Price, V. Jr. & Ferguson, R.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Extension of the EQ3/6 computer codes to geochemical modeling of brines

Description: Recent modifications to the EQ3/6 geochemical modeling software package provide for the use of Pitzer's equations to calculate the activity coefficients of aqueous species and the activity of water. These changes extend the range of solute concentrations over which the codes can be used to dependably calculate equilibria in geochemical systems, and permit the inclusion of ion pairs, complexes, and undissociated acids and bases as explicit component species in the Pitzer model. Comparisons of ca… more
Date: October 23, 1984
Creator: Jackson, K.J. & Wolery, T.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Geological and geochemical aspects of uranium deposits: a selected, annotated bibliography. [474 references]

Description: This bibliography, a compilation of 474 references, is the fourth in a series compiled from the National Uranium Resource Evaluation (NURE) Bibliographic Data Base. This data base was created for the Grand Junction Office of the Department of Energy's National Uranium Resource Evaluation Project by the Ecological Sciences Information Center, Oak Ridge National Laboratory. The references in the bibliography are arranged by subject category: (1) geochemistry, (2) exploration, (3) mineralogy, (4) … more
Date: September 1, 1980
Creator: Thomas, J. M.; Garland, P. A.; White, M. B. & Daniel, E. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Radioactive waste isolation in salt: peer review of the Office of Nuclear Waste Isolation's Geochemical Program Plan

Description: Describe the management program for coordinating subcontractors and their work, and integrating research results. Appropriate flowcharts should be included. Provide more information on the overall scope of the program. For each subcontractor, provide specific workscopes that indicate whether analytical activities are developmental or routine, approximate number of analyses to be made, and something of the adequacy of the analyses to meet program goals. Indicate interfaces with other earth-scien… more
Date: February 1, 1984
Creator: Harrison, W.; Seitz, M.; Fenster, D.; Lerman, A.; Brookins, D. & Tisue, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Evaluation of integrated data sets: four examples. [Uranium deposits (exploration)]

Description: Several large data sets have been integrated and utilized for rapid evaluation on a reconnaissance scale for the Montrose 1/sup 0/ x 2/sup 0/ quadrangle, Colorado. The data sets include Landsat imagery, hydrogeochemical and stream sediment analyses, airborne geophysical data, known mineral occurrences, and a geologic map. All data sets were registered to a 179 x 119 rectangular grid and projected onto Universal Transverse Mercator coordinates. A grid resolution of 1 km was used. All possible co… more
Date: January 1, 1982
Creator: Bolivar, S. L.; Freeman, S. B. & Weaver, T. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Geochemical Analyses, Age Dates, and Flow-Volume Estimates for Quaternary Volcanic Rocks, Southern Cascade Mountains, Washington

Description: Data collected over the last three years as part of a continuing study of the Quaternary volcanic rocks of the southern Cascade Mountains are presented. Whole-rock chemical analyses, selected trace element geochemistry, volume approximations, specific gravity determinations, and locations are provided for most of the 103 samples collected, and 21 radiometric age dates are included. In addition, partial information, including names and flow-volumes, are presented for 98 additional samples, colle… more
Date: December 1983
Creator: Hammond, Paul E. & Korosec, Michael A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Geotoxic materials in the surface environment

Description: The toxicology and natural occurrence of several recognized geotoxic elements including arsenic, cadmium, chromium, nickel, lead, selenium, uranium, and vanadium is reviewed. The behavior of these elements in the environment and in biological systems is examined. The properties of these eight toxic elements are summarized and presented in a toxicity matrix. The toxicity matrix identifies each of the elements in terms of average crustal abundance, average soil concentration, drinking water stand… more
Date: December 7, 1981
Creator: Koranda, J.J.; Cohen, J.J.; Smith, C.F. & Ciminesi, F.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Chemical modeling of irreversible reactions in nuclear waste-water-rock systems

Description: Chemical models of aqueous geochemical systems are usually built on the concept of thermodynamic equilibrium. Though many elementary reactions in a geochemical system may be close to equilibrium, others may not be. Chemical models of aqueous fluids should take into account that many aqueous redox reactions are among the latter. The behavior of redox reactions may critically affect migration of certain radionuclides, especially the actinides. In addition, the progress of reaction in geochemical … more
Date: February 1, 1981
Creator: Wolery, T.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Nuclear chemistry and geochemistry research. Carnegie Institute of Technology and Carnegie--Mellon University. Summary report

Description: A summary is presented of the activities and results of research in nuclear chemistry, nuclear geochemistry, nuclear cosmochemistry, and other minor areas from 1950 to 1976. A complete listing is given of publications, doctoral dissertations, and reports resulting from the research. A chronological list provides an overview of the activities at any particular time. (JSR)
Date: May 28, 1976
Creator: Kohman, T. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Geotechnical issues and guidelines for storage of compressed air in excavated hard rock caverns

Description: The results of a literature survey on the stability of excavated hard rock caverns are presented. The objective of the study was to develop geotechnical criteria for the design of compressed air energy storage (CAES) caverns in hard rock formations. These criteria involve geologic, hydrological, geochemical, geothermal, and in situ stress state characteristics of generic rock masses. Their relevance to CAES caverns, and the identification of required research areas, are identified throughout th… more
Date: April 1, 1982
Creator: Allen, R. D.; Doherty, T. J. & Fossum, A. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Filter-separable constituents of groundwater from the Columbia River plateau

Description: The purpose of this procedure is to prepare groundwaters from the Columbia River basalt, northeastern Oregon, for batch partitioning experiments by concentration dissolved organic carbon (DOC) in water samples by ultrafiltration. Water samples were double-filtered through 0.4-..mu..m Nuclepore polycarbonate filters to remove particulates before beginning the ultrafiltration process. The results of these experiments do not indicate a consistent relation between the distribution of americium with… more
Date: January 1, 1984
Creator: Seitz, M.G. & Boggs, S. Jr.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Geology along topographic profile for near-surface test facility

Description: The U.S. Department of Energy, through the Basalt Waste Isolation Program within Rockwell Hanford Operations, is investigating the feasibility of terminal storage of radioactive waste in deep caverns constructed in the Columbia River Basalt. A portion of the geological work conducted in support of the Engineering Design Unit to evaluate the west end of Gable Mountain as a site for in situ testing of the thermomechanical behavior of basalt is reported. The surficial geology of the west end of Ga… more
Date: January 1, 1978
Creator: Fecht, K.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Geochemistry of ground water at the Savannah River Plant

Description: Subsurface hydrogeologic systems underlying the Savannah River Plant (SRP) were studied to determine the origin and age of the contained fluids. Three distinct systems exist beneath SRP: the Coastal Plain sediments, crystalline metamorphic basement rock, and a Triassic rock basin surrounded by the crystalline rock. The water in the Coastal Plain sediments is low in dissolved solids (approximately 30 mg/l), acidic (pH approximately 5.5), and comparatively recent. Water in the crystalline rock is… more
Date: September 1, 1976
Creator: Marine, I. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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MININR: a geochemical computer program for inclusion in water flow models - an application study

Description: MININR is a reduced form of the computer program MINTEQ which calculates equilibrium precipitation/dissolution of solid phases, aqueous speciation, adsorption, and gas phase equilibrium. The user-oriented features in MINTEQ were removed to reduce the size and increase the computational speed. MININR closely resembles the MINEQL computer program developed by Westall (1976). The main differences between MININR and MINEQL involve modifications to accept an initial starting mass of solid and necess… more
Date: February 1, 1984
Creator: Felmy, A. R.; Reisenauer, A. E.; Zachara, J. M. & Gee, G. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Organic geochemistry of continental margin sediments

Description: Well cuttings from two offshore Gulf Coast stratigraphic test wells (South Padre and Mustang Island) have been analyzed for C/sub 7/-C/sub 15/ hydrocarbon distributions by thermal distillation-pyrolysis GC, for C/sub 1/-C/sub 7/ hydrocarbons by headspace analysis and for C/sub 15//sup +/ hydrocarbons by extraction. The results from the South Padre well show that the threshold of intensive hydrocarbon generation starts around 10,000 feet and peaks around 14,000 feet. The distribution of individu… more
Date: January 1, 1979
Creator: Hunt, J.M.; Whelan, J.K.; Huc, A.Y. & Pratt, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Geochemical orientation survey of stream sediment, stream water, and ground water near uranium prospects, Monticello area, New York. National Uranium Resource Evaluation Program

Description: A detailed geochemical test survey has been conducted in a 570 sq km area around six small copper-uranium prospects in sandstones of the Devonian Catskill Formation near Monticello in southern New York state. This report summarizes and interprets the data for about 500 stream sediment samples, 500 stream water samples, and 500 ground water samples, each analyzed for 40 to 50 elements. The groundwater samples furnish distinctive anomalies for uranium, helium, radon, and copper near the mineraliz… more
Date: August 1, 1982
Creator: Rose, A. W.; Smith, A. T. & Wesolowski, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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