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