Martin W. Molloy

Columbia University

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Paul F. Kerr

Middlesex University

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Middlesex University

Columbia University

London Metropolitan University

Stanford University

Ventura College

Pennsylvania State University

Occidental College

Freeport-McMoRan (United States)

Halliburton (United States)

Marathon Oil (United States)

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A comparative study of ten monazites

American Mineralogist (1959)

Martin W. Molloy

Optical, x-ray, and differential thermal methods are used to compare monazite recently discovered near Chester, New Jersey, with monazite from nine other localities. lndices of refraction, 2V and birefringence have been determined. X-ray-diffraction patterns have been measured, indexed, and their relationships determined. Micro-camera diffraction patterns have provided information on the alteration of monazite. The application of x-ray fluorescence to the quantitative analysis of rare earth elements in monazite is shown to be feasible through sensitivity to minor variations caused by crystal fractionation. Theoretical factors which interfere with precise x-ray fluorescence, quantitative analysis of rare earth elements in monazite are examined. The effect of two types of alteration, intercrystalline and intracrystalline, upon the differential thermal pattern of monazite is observed. (auth)

Differential thermal analysis

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Diffractometer patterns of A.P.I. reference clay minerals

American Mineralogist (1961)

Martin W. Molloy Paul F. Kerr

Diffractometer

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Tushar Uranium Area, Marysvale, Utah

Geological Society of America Bulletin (1962)

Martin W. Molloy Paul F. Kerr

Research Article| February 01, 1962 Tushar Uranium Area, Marysvale, Utah MARTIN W MOLLOY; MARTIN W MOLLOY Texaco, Inc., P. O. Box 3247, Ventura, Calif Search for other works by this author on: GSW Google Scholar PAUL F KERR PAUL F KERR Dept. Geology, Columbia University, New York, N. Y Search for other works by this author on: GSW Google Scholar Author and Article Information MARTIN W MOLLOY Texaco, Inc., P. O. Box 3247, Ventura, Calif PAUL F KERR Dept. Geology, Columbia University, New York, N. Y Publisher: Geological Society of America Received: 22 Aug 1960 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1962, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1962) 73 (2): 211–236. https://doi.org/10.1130/0016-7606(1962)73[211:TUAMU]2.0.CO;2 Article history Received: 22 Aug 1960 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation MARTIN W MOLLOY, PAUL F KERR; Tushar Uranium Area, Marysvale, Utah. GSA Bulletin 1962;; 73 (2): 211–236. doi: https://doi.org/10.1130/0016-7606(1962)73[211:TUAMU]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract A thick sequence of late Tertiary volcanic tuff covers portions of the Tushar Plateau in south-central Utah. Rhyolite of similar age fills parts of the Sevier River valley to the east. Mines along the valley produce uranium ore from deposits genetically related to the tuff and rhyolite. The threefold relation of mountain tuff, valley rhyolite, and uranium mineralization has been investigated by field mapping and laboratory study of the Mount Belknap volcanic group.Field mapping defines changes in the volcanic stratigraphy and shows the interfingering of the regional tuff with the local valley rhyolites. Primary features of compaction, intergradation, and flow folding suggest unusual modes of air-fall aggregation and subsequent gravity flow for the emplacement of some of the volcanic units.Thin section and clay-mineral investigations yield information about the primary structure of the volcanic units and the chemical and mineralogical reaction to alteration. Zeolites, quartz, and feldspar represent primary alteration features. Variations in kaolinite, montmorillonite, and mixed-layer clay suites reflect differences in the intensity of secondary alteration along fault zones.Quartz monzonite intrusives and associated ore bodies lie along a major east-west zone of weakness which passes through Marysvale, Utah. Younger fault systems cut across this zone and define the north-south axis of the Tushar Range. Uranium mineralization and related alteration phenomena have formed fissure veins along these younger fault trends. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

10.1130/0016-7606(1962)73[211:tuamu]2.0.co;2

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X-ray spectrochemical analysis: An application to certain light elements in clay minerals and volcanic glass

American Mineralogist (1960)

Martin W. Molloy Paul F. Kerr

Volcanic glass

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