Comparative study of the transition between very low-grade and low-grade metamorphism in siliciclastic and carbonate sediments; Early Cretaceous, Cameros Basin (northern Spain)

carbonate rocks Cameros Basin Lower Cretaceous clastic rocks metamorphism sedimentary rocks Southern Europe Castile Spain silicates sheet silicates Iberian Peninsula clay mineralogy Mesozoic Europe siliciclastics illite Spain Cretaceous Old Castile Spain Castilla y Leon Spain