RT Journal Article T1 Geoquímica orgánica de las lutitas lacustres de las cuencas cenozoicas del Duero y Ebro T1 Organic geochemistry from Cainozoic Ebro and Duero basins lacustrine lutites A1 Lucini, M. A1 Torres, Trinidad de A1 Llamas, F. J. A1 Canoira, L. A1 Ortiz, José Eugenio A1 García de la Morena, M. A. AB Biomarquer analytical results from Cainozoic age organic rich lutites from Duero and Ebro basin drill holes are presented. The presence and abundance of n-alkane, n-metil ketones, n-etil-ketonés, n-butil ketones and elemental sulphur are compared. Samples from Ebro basin bore hole core (PE-1) reveal alternances of "terrestrial" and "acuatic" lacustrine environmental conditions (shallowing versus deepening conditions) while samples from Duero basin borehole core (VS-1) show a constant "terrestrial (shallow) character PB Sociedad Geológica de España YR 1999 FD 1999 LK http://hdl.handle.net/10272/9874 UL http://hdl.handle.net/10272/9874 LA spa DS Repositorio Institucional de la Universidad de Huelva RD 30 may 2026