 | 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) | | 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...Mineoka alkali basalt (anl = analcime, cal = calcite, Cu = native copper). a. Native copper in an amygdule...partly altered to albite. Native copper grains are composed of nearly 100 wt % Cu with the only detectable...Copper in the Mineoka Alkali Basalt Sample type (wt %) Cu Fe Ni Zn Co S Total Native copper in calcite vein...Abbreviation: b.d.l. = below detection limit (~0.07 wt % for Cu, Fe, Ni, Co, S and ~0.15 wt % for Zn) of EPMA Bulk-rock |
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