The purpose of this study is to invetigate the ore genesis and occurrence of the Wondong polumetallic mineral deposits. The Pb-Zn, Fe and W-Mo mineralizations are found in skarn zones which formed mainly in or along the fault shear zones with the N25-40˚W and N10-50˚E directions, whereas the Cu-Mo mineralization is apeared hydrothermal relacement zone. The skarn minerals consist mainly of garnet and epidote, which were the last alteration phases between pneumatolytic and hydrothermal stage. The mineral paragenesis toward the late stage are as follows: arsenopyrite, scheelite, magnetite, pyrite, pyrrhotite, sphalerite, galena, chalcopyrite and molybdenite. Average ore grades are 0.33 g/t Au, 46.29 g/t, 0.06% Cu, 4.4% Pb, 2.61% Zn and 29.39% Fe in tunnels, and 0.31% cu, 0.52% Pb, 6.29% Zn, 29.29% Fe, 0.03% Mo and 0.12% WO₃in drill cores. Fluid inclusion data shows that Type I(liquid-rich), Type II (vapor-rich) and Type III (halite-bearing) inclusions are coexisted and their homogenization temperatures are quite similar. This indicates that boiling conditions have been reached during the mineralization. It is also likely that the ore solutions were evolved through the mixing between magmatic and meteoric waters. Phyolite and quartz porphyry far the mineralization probably are not responsible of the Wondong polymetallic mineral deposits.
(0)
(0)