Morfología de los circones como indicadores petrogenéticos de la asociación tonalita-leucogranito: El caso del plutón de Zarza la Mayor (Cáceres-España)

Zarza la Mayor pluton is a good example of the tonalite-leucogranite association. A new survey has been carried out and some additional study of zircon morphologies has been performed. Detailed survey shows the true intrusive character of the leucogranite pinpointing to a ring-dyke emplacement mechanism. Zircon morphologies show different characteristics for the tonalite (anatectic, with zircon typologies S1- Q1-L1) and leucogranite (calc-alkaline, with zircon typologies S6-Q2). This apparent paradox is explained taking care of the strong assimilation of CXG metasediments (Neoproterozoic - Lower Cambrian) by a dioritic-tonalitic magma through piecemeal-stopping processes.