Abstract

The Khâu Lộc structure zone covers the eastern and northeastern part of the Việt Bắc uplift block. The zone is composed mainly of terrigenous sedimentary rocks, quartz-sericite schist interbed of rhyolite tuff, carbonate sedimentary rocks that have different age and lead-zinc mineralization. The formation ages of two rhyolite erupted rock samples determined by U-Pb zircon isotopes on LA-ICP-MS is 835 and 441 Ma, corresponding to the Neoproterozoic and Paleozoic time. The analytical results of Pb-Pb isotope on galenite extracted from ore samples taken from lead-zinc ore veins interbeding in sericite schist, limestone-dolomite and rhyolite yielded model ages concentrated at 700-590 and 532-368 Ma. In combination with the U-Pb zircon isotopic age determined in this study, it can be said that lead-zinc mineralization in the Khâu Lộc structure zone is formed at least in two periods of time that are Neoproterozoic and Paleozoic.