Resumen de Autigénesis silícea en el Cámbrico inferior de la Unidad de Herrera (Cadena Ibérica Oriental)

Juan Miguel A. Mandado Collado, Luis Francisco Auqué Sanz, María José Gimeno Serrano, María Pilar Lapuente Mercadal, Pedro L. López Julián, Francisco Javier Torrijo Echarri

• Petrological study of detritic rocks from Bambola Formation (Lower Cambrian) has allowed to identify their complex diagenetic history with siliceous sintaxial overgrowths, pyritizations, chloritizations, Kfeldspar and tourmaline autigenesis and an extensive silicification process all over the Formation. Morphologic features of this last process suggest a replacement origin of matrix and clasts. Silica derived from abundant quartz veins, nucleated over detritic clasts replacing or displacing the matrix and, partly, the clasts. This process was so extensive that the original texture was modified to form a pseudoconglomeratic fabric that could promote important missinterpretations in their depositional environment.