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Rare accessory uraninite in a Sierran graniteOne grain of uraninite was found in a single thin-section of Sierran granite. Electron and ion microprobe analysis were used to determine the composition. Since the U-Pb age calculated for the uraninite does not differ greatly from the K-Ar age of the unit in which it occurs, it is suggested that the mineral is primary and not reworked from a preexisting rock. No uraninite has been detected in heavy mineral concentrates from other rocks of the local area.
Document ID
19770060162
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Snetsinger, K. G.
(NASA Ames Research Center Space Sciences Div., Moffett Field, Calif., United States)
Polkowski, G.
(LFE Corp. Richmond, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1977
Publication Information
Publication: American Mineralogist
Volume: 62
Subject Category
Earth Resources And Remote Sensing
Accession Number
77A43014
Distribution Limits
Public
Copyright
Other

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