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

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