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, Reported errors (1?) integrate ca. 3% uncertainty on 3 Het measurements and 10% and 31% uncertainties on nucleogenic and magmatic contribution estimates, respectively. f Local cosmogenic 3 He production rates estimated from 3 Hec concentrations scaled to the surface, an open-sky topography and 21.934°S-68.510°W and 3390 m a.s.l. and the age of the lava based on the 40 Ar/ 39 Ar dating. Bracketed values correspond to external errors (1?) and include the ca