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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.
Item Type: Refine your search to only Report
Location: None
Partner: UNT Libraries Government Documents Department
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Muscovite in the Spruce Pine District, North Carolina

Description: From Abstract: "This report describes the occurrence of the mica and its physical properties among which is an unusually wide range of colors. A table is presented showing the results of power-factor measurements made by the National Bureau of Standards on 196 samples of sheet mica from 109 mica mines and 15 feldspar mines.It is concluded that more systematic planning of mica mining, for the district as a whole. would result in an average yearly production of at least 90,000 pounds of relativelā€¦ more
Date: 1942
Creator: Kesler, Thomas L. (Thomas Lingle), 1908-1997 & Olson, J. C. (Jerry Chipman), 1917-2013
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Geographic Dictionary of Rhode Island

Description: A paper designed to aid in finding any geographic feature upon the atlas sheets of Rhode Island published by the U. S. Geological Survey. It contains the names given upon those sheets.
Date: 1894
Creator: Gannett, Henry
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Specification of Source Zones, Recurrence Rates, Focal Depths, and Maximum Magnitudes for Earthquakes Affecting the Savannah River Site in South Carolina

Description: Report presenting documentation for the development of seismicity parameters to be used as input for probabilistic seismic hazard analyses at the Savannah River Site in South Carolina.
Date: 1992
Creator: Bollinger, G. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Base- and Precious-Metal Concentrations of Early Proterozoic Massive Sulfide Deposits in Arizona- Crustal and Thermochemical Controls of Ore Deposition

Description: A report about early proterozoic massive sulfide deposits associated with submarine mafic to felsic metavolcano rocks are present throughout central, west-central, and northwestern Arizona. Also, production data for copper, lead, zinc, gold, and silver for most of the known deposits and prospects in 13 metallic mineral districts are summarized.
Date: 1995
Creator: DeWitt, Ed
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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