串木野地区に分布する石英・方解石脈中の金,銀及び希土類元素  [in Japanese] Gold, silver and rare earth elements in quartz-calcite veins distributed over Kushikino district  [in Japanese]

The samples of quartz-calcite vein obtained from 8 boring cores around Kushikino gold-silver mine, Kagoshima prefecture, were analyzed by neutron activation analysis. Contents of gold, silver and rare earth elements (lanthanum, cerium, samarium, europium, terbium and ytterbium) were determined. Gold contents in Kushikino area near gold-silver mine were higher than those in Kammuridake area near heat source. Ag /Au ratios were below 10 in Kushikino area while about 100 in Kammuridake area. Relative abundance patterns of rare earth elements normalized to the chondrite (Ln_sample/Ln_chondrite) values showed gradual depletion in heavy REE and had positive europium anomaly. The normalized values by the chondrite showed approximately linear correlation with ionic radius of REEs, and slopes [log(Ln_sample/Ln_chondrite)/r] of the straight lines are obviously different between Kushikino area (average 8.5) and Kammuridake area (average 6.2).