Figure 2 | Scientific Reports

Figure 2

From: Molybdenum-isotope signals and cerium anomalies in Palaeoproterozoic manganese ore survive high-grade metamorphism

Figure 2

Evidence for a Palaeoproterozoic age for the Morro da Mina Mn-ore deposit. (a) Diagram of U–Pb age vs. probability for detrital grains of zircon from quartzite of the Mn-ore sequence at Morro da Mina. (b) Concordia diagram for magmatic zircon from a granodiorite dyke hosted in the Mn ore – i.e., queluzite. Insets in both diagrams show backscattered-electron images of zircon grains on which analytical spots are marked. Spot numbers refer to analyses presented in Table S1 (Supplementary Information). The deposition of manganiferous sediments is constrained between about 2.07 and 1.86 Ga.

Back to article page