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DOI | 10.5027/ANDGEOV44N1-A03 | ||||||
Año | 2017 | ||||||
Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
The Neuquen Basin in northwestern Patagonia, Argentina, holds the most important record of Cretaceous dinosaurs in South America. The Neuquen Group (Upper Cretaceous) is the richest dinosaur-bearing unit of the basin. It comprises the Rio Limay, the Rio Neuquen and the Rio Colorado subgroups. In this study, dinosaur remains from the Rio Neuquen and the Rio Colorado subgroups outcropping in Mendoza are examined. In this group, isolated, disarticulated or partially articulated sauropods and theropods are abundant. However, little is known about the diagenetic history of fossil assemblages. In southern Mendoza, three fossiliferous sites were found in the areas of Paso de las Bardas (Quebrada Norte) and Cerro Guillermo (CG1, CG2). This study aims to add to the knowledge of diagenetic processes involving dinosaur remains from the Neuquen Group, as well as their relation to the depositional environment. Histologic features and diagenetic processes of dinosaur bones were analyzed through thin sections in order to interpret the degree of taphonomic alteration. The fossil-diagenetic processes inferred include substitution, fracturing, plastic deformation and different permineralization events. Combined analyses through X-ray diffractometry (XRD) and petrographic studies reveal the substitution of hydroxyapatite by francolite. The presence of fluorine -in one of the cases-suggests a link between the elemental composition and depositional environments: floodplain and fluvial channel. Permineralization stages include infilling of vascular canals, trabeculae and fractures with iron oxides and iron carbonate minerals during the burial history. This contribution represents an integral approach to the study of Cretaceous dinosaurs for assessing the diagenetic changes in the bone microstructure and the differential preservation of fossil remains in fluvial environments.
Ord. | Autor | Género | Institución - País |
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1 | Previtera, Elena | Mujer |
Comision Nacional de Investigacion Cientifica y Tecnologica - Argentina
CCT-CONICET-Mendoza - Argentina Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) - Argentina |
Agradecimiento |
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This paper evolved from discussions of various taphonomicand environmental aspects of the author's doctoral dissertation at the Universidad Nacional de Cordoba, Argentina. I thank B. Gonzalez Riga and R. Astini for directing the paleontological works that made this manuscript possible. The petrographic microscope used for histological and diagenetic analysis was provided by the Facultad de Ciencias Exactas, Fisicas y Naturales (Universidad Nacional de Cordoba-CONICET). The IANIGLA-CCT-Mendoza provided assistance during fieldworks. I gratefully acknowledge M. Reichel and R. Coria reviewers for their constructive and valuable comments which improved the manuscript. I especially thank M. Bourguet and C. Sancho for their valuable support in the fieldworks. I am particularly grateful to A. Mancuso for her constructive comments and L. Starkman for improving the English version. This research was supported by the following projects PICT BID 2005/33984 to J. Calvo; PIP CONICET 5222 to W. Volkheimer and PIP 0713/09 to B. Gonzalez Riga. |