Mineralogía y cambios composicionales en fragmentos óseos atribuidos a un dinosaurio ornitópodo del yacimiento barremiense de Buenache de la Sierra (Formación Calizas de La Huérguina, Cuenca, España)

摘要: X-ray diffraction, optical polarizing microscopy, scanning electron microscopy and microprobeto, have been used to analyse the diagenetic processes of isolated dinosaur bones ribs attributed an ornithopod from Buenache de la Sierra (Upper Barremian, La Huerguina Formation). We also examine geochemical mineralogical bone mineralization extant archosaurs (caiman bird) for comparison. Diagenetic modified original chemical composition studied fragments bones, as well its crystallinity, which increases in fossil samples. In recent hydroxyapatite results main mineral constituent, while fossils is fluorapatite. found two types arrangements: one group exhibiting spongy structure completely collapsed forming breccias fragments, a second with preserved but substituted by calcium carbonate. Calcite most abundant authigenic infilling pores fissures fossilized remains. The presence pyrite cavities suggests early burial stage under euxinic conditions reductor environment. biostratinomic fossildiagenetic alterations allow us conclude that remains distinct taphonomic histories, association undergone taphonomical resedimentation.