Fig. 8
Geochronologic chart of Cenozoic rocks in the Macusani Structural Zone and Cordillera de Carabaya6,9,10,11,15,20,21,22,23,70,71,72,73, including the new 40Ar/39Ar zinnwaldite-lepidolite dates on Lithium-rich Tuff from the Falchani Lithium Project in the Macusani Volcanic Field. Some of the published 40Ar/39Ar ages11,15,72 were calibrated against a LP-6 fluence monitor that does not have reliable intercalibration factors to the Fish Canyon Tuff sanidine monitor74. However, the available intercalibration ratios75 indicate the previously determined ages should be ~ 1% older when recalculated using the same decay constant and fluence monitor age as our new age determinations.
