Abstract
In Colombia, recent lavas from Nevado del Huila and Purace volcanoes, located in the middle part of the Cordillera Central, show geochemical characteristics with a adakitic signature (i.e. high Sr and LREE contents, low Y and HREE contents, high Sr/Y and La/ Yb, 87Sr/86Sr <0,7045). These geochemical characteristics have been associated to specific tectonic settings that allow the participation of subduced slab melts in the genesis of the magmas. Analysis of seismicity and gravimetric anomalies allows to infer the geometry of the subduction, and the information from magnetic anomalies and ages of the oceanic floor, make possible to postulate the participation of a Nazca Plate feature (Buenaventura paleo-rift), in the petrogenesis of the magma feeding those volcanoes, that could be originated by the partial melting of a mantle wedge, probably metasomatized by melts from the subducting slab, with little or limited crustal assimilation.
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