Las adakitas de la Cordillera Patagónica: Nuevas evidencias geoquímicas y geocronológicas
作者： V.A. Ramos , S.M. Kay , B.S. Singer
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摘要: The adakites of the Patagonian Cordillera: new geochemical and geochronological evidences. origin many ascribed to slab melting has been questioned with their formation being attributed thickened continental crust or forearc subduction erosion. Some best remaining candidates for a slab-melt are Cerro Pampa (47°55'SL) in Patagonia that erupted east inactive volcanic arc as Chile Ridge collided Trench at ca. 12 Ma. Support these hornblende-bearing dacites comes from high Sr concentrations (1330-2300 ppm) 63-68% SiO 2 , MORB-like 87
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