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Distribution of Ore Deposits and Spectrographic Analyses of Some Rocks and Ores on the Colorado Plateau

Description: Report discussing an investigation of rocks and ores found on the Colorado Plateau. These studies were conducted in order to determine distribution of elements and the various relationships of ore deposits and igneous rocks.
Date: December 1952
Creator: Riley, Leonard B. & Shoemaker, Eugene N.
Partner: UNT Libraries Government Documents Department

The Gabbros and Associated Hornblende Rocks Occurring in the Neighborhood of Baltimore, Maryland

Description: From introduction: The present paper is intended as a contribution to our knowledge of a particular phase of metamorphism in eruptive rocks, i.e., that one which is dependent on the secondary development of hornblende by the paramorphism or pseudomorphism of pyroxene.
Date: 1886
Creator: Williams, George Huntington
Partner: UNT Libraries Government Documents Department

Uranium in Alkaline Rocks

Description: Report describing the results of a literature search, a limited chemical analytical program, and visits to three alkaline-rock localities intended to establish criteria for determining if a site had uranium resource potential. The criteria were applied to various sites in the U.S.; those results are also reported, with additional information about ongoing study.
Date: 1978
Creator: Murphy, Michael A.; Wollenberg, H. A.; Strisower, Beverly; Bowman, H.; Flexser, S. & Carmichael, I.
Partner: UNT Libraries Government Documents Department

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

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 consolidation, identical in character with their recent volcanic analogues, and that their present differences are due to subsequent changes, chief among which has been devitrification. It is also proposed to recognize these facts in the nomenclature.
Date: 1896
Creator: Bascom, Florence
Partner: UNT Libraries Government Documents Department

Uranium in Alkaline Rocks: Appendix E. Literature Base

Description: Appendix of literature reviewed for a report on establishing criteria to evaluate the existence of uranium at various sites. Each entry includes the title, author, reference, and descriptors.
Date: 1978
Creator: Murphy, Michael A.; Wollenberg, H. A.; Strisower, Beverly; Bowman, H.; Flexser, S. & Carmichael, I.
Partner: UNT Libraries Government Documents Department

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 million years; those determined on 4 rocks from central Alaska gave results of 47, 56, 58, and 51 million years."
Date: March 1957
Creator: Matzo, J. J.; Jaffe, H. W. & Waring, C. L.
Partner: UNT Libraries Government Documents Department

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 Info:
Partner: UNT Libraries Government Documents Department

Some Lava Flows of the Western Slope of the Sierra Nevada, California

Description: From introduction: The field relationships of the rocks described in the following paper were studied during the summers of 1895 and 1896, while I was engaged in geologically mapping portions of the Sonora and Big Trees quadrangles, under the direction of Mr. H. W. Turner.
Date: 1898
Creator: Ransome, Frederick Leslie
Partner: UNT Libraries Government Documents Department

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

Multispectral thermal imager observations of the moon during total eclipse.

Description: Lunar eclipse temperature measurements are sensitive to rock populations because surfaces with abundant exposed rock have much higher mean thermal inertias than surfaces dominated by fine powders . When the Moon passes into the I :arth's shadow, the abrupt reduction in insolation causes surfacc elements to cool at rates which are ILnctions oftheir thermal inertia . The rock population is a lunction of the exposure of a surface unit, originally composed of solid igneous rock or impact mclt, to the impact flux of modest sized projectiles. With time, a competent surface such as a lava flow field or an impact melt sheet will be comminuted by the impact flux reducing the ratio of coarse to fine particles . In principle, thermal measurements taken during lunar eclipse can be used as a measure of the relative age of surface units .
Date: January 1, 2003
Creator: Lawson, S. L. (Stefanie L.); Rodger, A. P. (Andrew Paul); Bender, S. C. (Steven C.); Lucey, P. G. (Paul G.) & Henderson, B. G. (Bradley G.)
Partner: UNT Libraries Government Documents Department

Influence of Carbon on the Electrical Properties of Crustal Rocks

Description: The report summarizes work to determine the nature and distribution of carbon on microcracks in crystalline rocks by time-of-flight secondary ion mass spectroscopy. It also summarizes the results of a workshop devoted to investigating how carbon in rocks influences electrical conductivity and whether carbon on fracture surfaces can account for the electrical conductivity structure of the crust.
Date: November 19, 2002
Creator: Mathez, E. A.
Partner: UNT Libraries Government Documents Department

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 and their results are discussed. It is shown that themain physical processes are common to all three rock types, but with verydifferent time constants. The different issues raised by these cases arepointed out, and the transferable lessons learned are identified. Suchcross fertilization and simultaneous understanding of coupled processesin three very different rock types help to greatly enhance confidence inthe state of science in this field.
Date: February 15, 2006
Creator: Tsang, Chin-Fu; Blumling, Peter & Bernier, Frederic
Partner: UNT Libraries Government Documents Department

National Uranium Resource Evaluation: Pueblo Quadrangle, Colorado

Description: From Introduction: "The Front Range region from the Wyoming-Colorado state line to southern Colorado is a uranium metallogenic province. Correspondingly, uranium has been discovered in mineable deposits in metamorphic, igneous, and sedimentary rocks formed throughout the geologic history of the region both within the Front Range itself and in the apron of sedimentary rocks that surrounds the Front Range. The Pueblo 1ºx2º National Topographic Map Series (NTMS) quadrangle, Colorado (Fig. 1), which lies within this uranium metallogenic providence, was evaluated to identify and delineate areas and geologic units that exhibit characteristics favorable for the occurrence of uranium deposits."
Date: September 1982
Creator: Dickinson, Kendell A. & Hills, Francis Allan
Location Info:
Partner: UNT Libraries Government Documents Department

Geology of the Castle Mountain Mining District, Montana

Description: From preface: This memoir is a general study of the region described, and not a detailed report. The field work upon which it is based formed a part of the work of mapping the areal geology of the Little Belt Mountains sheet of the Geological Survey. The topographic map, made in 1882 by the Northern Transcontinental Survey, is too small in scale and too general in character to warrant more detailed work; but as the facts obtained are of interest, and the region is one of economic importance, it has been considered worthy of a special treatment.
Date: 1896
Creator: Weed, Walter Harvey & Pirsson, Louis Valentine
Partner: UNT Libraries Government Documents Department