Ciclicidad estacional en perfiles de isótopos de C y O de Megacardita jouanneti del Tortoniense superior de Cacela (Algarve, Portugal) y Arroyo Trujillo (Sevilla, España)

Abstract

Keywords: C and O isotopes; Megacardita jouanneli profiles; Tortonian; Guadalquivir Basin. Two C and O isotopic profiles of the bivalve Megacardita jouanneli from the Upper Tortonian of Cacela (portugal) and Arroyo Trujillo (Spain) (Guadalquivir Basin) are studied. They include 57 samples drilled from the umbonal to ventral margin. The cyclic organisation is best in the O profile of the Arroyo Trujillo shell. lsotopic values are similar in both profiles, with the same mean values (0,6-0,5), althought oxygen values range is higher (2,15delta) in the Cacela bivalve than in that of the Arroyo Trujillo one (1,17delta). This could be related with a higher anual range of temperatures in Cacela than in Arroyo Trujillo.