From dacite-porphyries→Cu-Pb-Zn ore→Pb-Zn ore,the content of K~(+),Na~(+),Ca~(2+),Mg~(2+),Cl~(-),F~(-) in liquid phase of fluid inclusion is going to decline while SO~(2-)_4content is increasing,indicating more oxidability in fluid.
This paper deals with geological setting, host strata, ore-control structures, ore-bearing magmatic rocks, mineralization features, mineral assemblage, ore guide and prospecting perspective for Cu-Pb-Zn ore deposits in the Yanyuan basin.
It is concluded that the Cu-Pb-Zn mineralizations in the Dajing and Caijiaying deposits resulted from the identical tectono-thermal event of magma-fluids induced by Mesozoic tectonic transition and extension in the eastern part of North China Craton.
The strata-bound Cu-Pb-Zn polymetallic sulfide deposits occur in metamorphic rocks of greenschist phase of the middle-upper Proterozoic Langshan Group in central Inner Mongolia.
Six zones may be recognized from the granite mass outwards: (1) Nb-Ta-(Li-Be-Mo), (2) Sn, (3) W-(Sn), (4) Cu-Pb-Zn-(Bi), (5) Sb-Hg, and (6) Au-Ag.
Stratiform Cu-Pb-Zn (-Au-Ag) mineralization associated with black carbonaceous schists and acid metatuffs is restricted to distinct horizons within the Cretaceous sequence of the Diahot region.
Based on the fluid inclusion "gas" signature for the Carrock Fell deposit, a distinction can be made between potentially tungstaniferous quartz veins and those related to Cu-Pb-Zn deposits in the absence of diagnostic ore minerals.