Resistencia a la alteración diagenética de conchas de Chondrodonta sp en las calizas rojas del Aptiense – Albiense inferior de Ereño (Bizkaia)

Abstract

Chondrodonta sp. shells from Aptian – Lower Albian red limestones of Ereño (Bizkaia, northern Spain) have proved to be excellent indicators of a high resistance to the entrance of diagenetic fluids and further diagenetic alteration. Chondrodonta sp. shells, when compared to their coeval rudist shells, show higher Sr+2 and Na+ contents, together with very dull or even null luminescence. For this reason they could be very appropriate for further C, O an Sr isotopic studies as a tool for reconstruction of palaeotemperatures and palaeoenvironmental conditions