Carlos Palacios M, Roberto Oyarzún M; Relationship between depth to Benioff zone and K and Sr concentrations in volcanic rocks of Chile. Geology ; 3 (10): 595–596. doi: https://doi.org/10.1130/0091-7613(1975)3<595:RBDTBZ>2.0.CO;2
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Cenozoic volcanism in the Andes occurs near the boundary of convergent oceanic and continental lithospheric plates. In Chile, the K concentration in the calc-alkalic volcanic rocks increases with the calculated depth to the Benioff zone; however, the correlation is very poor. The Sr concentration in the andesitic rocks correlates very well with the calculated depth to the Benioff zone, with the Sr concentration increasing with depth.