OCCURRENCE OF RADIOACTIVE MINERALS IN THE PEGMATITES OF THE OKU-TANGO DISTRICT, KYOTO PREFECTURE

Journal Article · Tue Nov 01 04:00:00 EST 1960 · Chishitsu Chosasho Geppo (Japan)

OSTI ID:4799236

Haraguchi, K; Takeichi, T; Tsukawaki, Y; Takeuchi, T

Newly found uraninite-like minerals and uranium bearing reddish brown zircon were found in small ore-pockets of the Oro pegmatite. The uraninite-like mineral may be considered as a mineral of uraninite-thorianite series from the results of spectroanalysis and intensity of radioactivity measured. The reddish brown zircon shows a higher content of U/sub 3/O/sub 8/ than the dark brown zircon, already known as Oro-ishi (U/sub 3/O/sub 8/3%). Detailed geological and radiometric studies for two important deposits in the Oro and Kobe areas were also made. A tongue-like or belt-shaped aplite runs in the pegmatite, and the uraninite always occurs as fine grains in small ore-pockets which are found in the pale reddish microcline parts. Radioactivity of these parts is extremely high. A count-map was projected about the northwestern slope of the Kobe pegmatite in which equicount lines were described. A portion of the white- colored microcline shows below 200 counts per minute, while that of the reddish- colored microcline is above 500 counts at least, occasionally up to 1000 or 2000 counts, in which Kobe-ishi and the other radioactive minerals are casily found. Radioactive minerals from the Oro and Kobe pegmatites are very small in amount, and are not workable. Many pegmatite and quartz veins are found in Naka-gun and its adjoining district. Geologically speaking, all pegmatites of this district are distributed in NW and NE directions, which coincide with tectonic lines such as directions of faults, dikes of andesite, and quartz porphyry or joints of granites. The parent rocks (biotite- granite), general characters of the pegmatites and radioactive minerals, and paragenesis of ore minerals and their alterations are described. (auth)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-16-009000
• OSTI ID: 4799236
• Journal Information: Chishitsu Chosasho Geppo (Japan), Journal Name: Chishitsu Chosasho Geppo (Japan) Vol. Vol: 11; ISSN CHCGA
• Country of Publication: Country unknown/Code not available
• Language: Japanese

Related Subjects

ALUMINUM SILICATES
ANDESITES
APLITES
BIOTITE
COLOR
CONFIGURATION
DEFORMATION
DEPOSITS
DETECTION
DISTRIBUTION
FELDSPARS
GEOCHEMISTRY
GEOLOGY
GEOLOGY, MINERALOGY, AND METEOROLOGY
GRAIN SIZE
GRANITES
IGNEOUS ROCKS
IRON SILICATES
JAPAN
MAGNESIUM SILICATES
MICROCLINE
MINERALS
PEGMATITES
POTASSIUM SILICATES
QUANTITY RATIO
QUARTZ
RADIOACTIVITY
SPECTROSCOPY
THORIANITE
THORIUM OXIDES
U3O8
URANINITES
URANIUM ORES
ZIRCONIUM SILICATES