Environment of Ore Deposition at the Akenobe Mine, Central Japan

Abstract

The Akenobe mine is composed of xenothermal polymetallic veins, genetically related to Late Cretaceous or Early Tertiary granitic activity. The deposit indicates the characteristic zonal distribution of minerals from the mineralization centre outward: (1) tin-tungsten zone, (2) tin-copper zone, (3) copper-zinc zone, (4) zinc-lead zone, (5) silver zone. The succession of mineralization or paragenesis is generally same as this order. The geochemical environment of the mineralization would change towards low f_s2-f_o2 conditions, as the temperature dropped.