| Ikehata, Kei, Chida, Kohsuke, Tsunogae, Toshiaki, Bornhorst, Theodore J. (2016) HYDROTHERMAL NATIVE COPPER IN OCEAN ISLAND ALKALI BASALT FROM THE MINEOKA BELT, BOSO PENINSULA, CENTRAL JAPAN. Economic Geology, 111 (3) 783-794 doi:10.2113/econgeo.111.3.783 | Journal (article/letter/editorial) | the amygdules or veins along with calcite and analcime. The temperature of precipitation and salinity...contain calcite and in some cases native copper, analcime, and Fe oxide mineral. Although native copper...native copper grains occur in the calcite and analcime amygdules (Fig. 4a) and/or veins (Fig. 4b-d)....Amygdules are mostly monomineralic whereas calcite, analcime, and native copper can coexist in the same vein...groundmass. a b Cu Cu and cal vein cal 1 mm c 1 mm d Cu cal vein 1 mm Cu and anl vein 1 mm |
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