U-series evidence for crustal involvement and magma residence times in the petrogenesis of Parinacota volcano, Chile

  title={U-series evidence for crustal involvement and magma residence times in the petrogenesis of Parinacota volcano, Chile},
  author={B. Bourdon and G. W{\"o}rner and A. Zindler},
  journal={Contributions to Mineralogy and Petrology},
Abstract In this study, we present Th–U disequilibria as well as radiogenic and trace element data for recent volcanic rocks from the Nevados de Payachata volcano which erupted through ∼70 km of continental crust in the Central Volcanic Zone of the Andes (18°S, 69°W). Both lavas and mineral separates were analyzed by mass spectrometry for 238U–230Th disequilibria. The lavas are characterized either by 230Th enrichment or depletion relative to its parent nuclide 238U. Mineral separates are used… Expand
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