first batch of isotope data. the arc front seems to stand apart from the rear arc samples.
i made an enormous database this past year. here are the sample sites. can you identify the three volcanic zones of the andes? the galapagos? the sierra nevada, hawaii, iran, tibet?
Distribution of volcanic products in western Bolivia. Pink = Neogene tuffs, brown = Neogene lavas, red = Quaternary lavas, grey = salt flats. Note Tunupa volcano just north of the salar de Uyuni, the furthest easterly Quaternary stratovolcano on the Altiplano. Soniquera and Uturuncu are the eastern stratovolcanoes furhter south in the Altiplano-Puna region.
Geology doesn’t end at the border but my maps do.