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Lithogeochemistry and fluid inclusions of an Au-Ag vein deposit in a granodiorite intrusive

Conference · · Geol. Soc. Am., Abstr. Programs; (United States)
OSTI ID:6593115
;
Forty-eight samples of altered and unaltered rocks and quartz veins from the Acme mine in northeast Washington, an Au-Ag vein deposit in a granodiorite intrusive, have been analyzed for SiO/sub 2/, Al/sub 2/O/sub 3/, Fe/sub 2/O/sub 3/, Feo, MgO, CaO, Na/sub 2/O, K/sub 2/O, TiO/sub 2/, MnO, P/sub 2/O/sub 5/, H/sub 2/O, CO/sub 2/, Ag, Au, Ba, Cu, Pb, Rb, Sr, Tl, and Zn. A comparison of major and trace elements shows that the altered granodiorite is enriched in SiO/sub 2/, Fe/sub 2/O/sub 3/, K/sub 2/O, Ag, Au, Ba, Cu, Pb, Rb, Tl, and Zn and depleted in Al/sub 2/O/sub 3/, FeO, MgO, CaO, Na/sub 2/O, TiO/sub 2/, MnO, P/sub 2/O/sub 5/, and Sr. The average contents of Au in unaltered and altered granodiorite and quartz veins are 9 ppb. 270 ppb and 1020 ppb respectively. The average Ba/Tl ratio in the altered samples decrease and average Rb/Sr and Tl/Sr ratios increase. K, Rb, and Tl are enriched in the altered granodiorite by factors of 1.5, 1.6, and 1.4 respectively. Tl is not enriched relative to Rb and K in the altered samples due to the high temperature of the deposit. The Ba/Tl, K/Tl and K/Rb ratios do not show complete separation of altered from unaltered samples. However, the Ba/Tl and K/Tl ratios in the quartz vein are significantly lower than the unaltered and altered granodiorite. This is due to the enrichment of Tl over K and Rb in the quartz veins. The Rb/Sr and Tl/Sr ratios are higher in the altered granodiorite and quartz veins compared to unaltered samples. The enrichment of Tl and presence of low Ba/Tl and high Rb/Sr and Tl/Sr ratios in a granodiorite indicate that the rocks are hydrothermally altered and represent a possible Au-Ag target.
Research Organization:
Eastern Washington Univ., Cheney (USA)
OSTI ID:
6593115
Report Number(s):
CONF-8510489-
Conference Information:
Journal Name: Geol. Soc. Am., Abstr. Programs; (United States) Journal Volume: 17
Country of Publication:
United States
Language:
English

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Related Subjects

58 GEOSCIENCES
580400* -- Geochemistry-- (-1989)
ALKALI METALS
ALKALINE EARTH METALS
BARIUM
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMISTRY
COPPER
ELEMENTS
FEDERAL REGION X
GEOCHEMISTRY
GOLD ORES
GRANITES
GRANODIORITES
HYDROTHERMAL ALTERATION
IGNEOUS ROCKS
INCLUSIONS
LEAD
LITHOLOGY
METALS
MINERALIZATION
MINERALS
NORTH AMERICA
ORES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PETROGENESIS
PLUTONIC ROCKS
QUARTZ
ROCKS
RUBIDIUM
SALINITY
SILICON COMPOUNDS
SILICON OXIDES
SILVER ORES
STRONTIUM
TRANSITION ELEMENTS
USA
WASHINGTON
ZINC