TRACE FOSSILS AS TOOLS TO UNRAVEL OXYGEN CONDITIONS. A CASE STUDY FROM LOS MOLLES FORMATION (TOARCIAN - LOWER CALLOVIAN)

Débora Mical Campetella, Noelia Beatriz Carmona, Juan José Ponce, Andreas Wetzel, Maximiliano Rodríguez, Martín Nazareno Parada

Resumen


The Toarcian – lower Callovian Los Molles Formation in the Chacay Melehue section (southern limb of Cordillera del Viento - Neuquén Basin) comprises offshore-shelf deposits and subordinately, channel-levee and lobe deposits produced by density currents. These deposits are characterized by two distinctive trace fossil suites: (1) Chondrites and Trichichnus in the offshore-shelf mud, and (2) Chondrites, Trichichnus, and Phycosiphon occurring in distal levee deposits. The generally low diversity and abundance of the trace fossils suggest severe environmental conditions. In particular, in the intervals containing Chondrites and Trichichnus, pyrite framboids are abundant and most likely indicate low oxygen availability within the sediment. The presence of Phycosiphon in the levee deposits implies short periods of improved oxygenation caused by the density currents originating in shallow water.


Texto completo



Licencia Creative Commons
Los trabajos publicados en esta revista están bajo la licencia Creative Commons Atribución-NoComercial 2.5 Argentina.

Revista de la Asociación Geológica Argentina. ISSN en línea 1851-8249.ISSN impreso 0004-4822. ISSN CD-ROM 2250-5571. Registro de la Propiedad Intelectual Nº 52500703. Asociación Geológica Argentina. Maipú 645 (1006), Buenos Aires, República Argentina. Teléfono y Fax:  (+54) 11 4325 3104. http://www.geologica.org.ar/ secretaria@geologica.org.ar