Fig. 12
Lead isotopic compositions of ores from the late Miocene epithermal deposits in the central Andes (between about 16°‒21°S), compared with potential metal sources. Lead isotope data of ores are taken from Kamenov et al.60, Macfarlane and Lechtman71 and this study (for Laurani deposit). Lead isotopic compositions of Nazca Plate MORB, Nazca Plate sediments and Pz, K and T sedimentary rocks are drawn from Kamenov et al.60; Lead isotopic compositions of Arequipa Massif basement are based on Mamani et al.67 and Ramos68, in the plot of 207Pb/204Pb vs. 206Pb/204Pb modified from Ramos68, in the plot of 208Pb/204Pb vs. 206Pb/204Pb modified from Macfarlane and Lechtman71, whose 208Pb/204Pb ratios are higher than those of Mamani et al.67 and Ramos68.
