Geochemical Data from Cordon Puntas Negras

Rock Type Andesite, Dacite
Petrography plag + opx + cpx +/- hbl +/- bt
Age Mio-Pliocene
SiO2 59-65
Al2O3 16-17
K2O+Na2O 6.1-7.13
K2O/Na2O 0.6-1
Sr 384-718
Ba 451-642
Ba/Rb 3.3-6.1
Rb/Sr 0.14-0.3
Ta/Th 0.05-0.1
87Sr/86Sr 0.70701-0.70720
207Pb/204Pb 15.63-15.64
208Pb/204Pb 38.84

From Matteini et al., 2002


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