PALYNOLOGY, PALYNOFACIES AND GEOCHEMISTRY ON THE TRIASSIC CASA PIEDRA FORMATION, RINCÓN BLANCO GROUP, ARGENTINE PRECORDILLERA: DEPOSITIONAL ENVIRONMENT AND HYDROCARBON POTENTIAL

Authors

  • Eduardo Guillermo Ottone
  • Javier Macino Universidad de Buenos Aires. Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Pabellón II Ciudad Universitaria, C1428EHA, Ciudad Autónoma de Buenos Aires
  • Georgina Erra CONICET – Cátedra de Paleobotánica, Museo de La Plata, Paseo del Bosque s/n, B1900FWA La Plata, Buenos Aires Province
  • Silvia Barredo Instituto Tecnológico de Buenos Aires, Departamento de Postgrado, Av. Eduardo Madero 399, C1106ACD Ciudad Autónoma de Buenos Aires
  • Fernando Larriestra Laboratorio de Geoquímica Orgánica, Gerencia de Geociencias, YPF Tecnología S.A., Avenida del Petróleo Argentino s/n entre 129 y 143, B1925VYB Berisso, Buenos Aires Province

Keywords:

Miospores, pollen, Algae, Kerogen, San Juan province

Abstract

This paper presents the study of the kerogen recovered from the Casa de Piedra Formation. The analysis includes systematic palynology, palynofacies, organic geochemistry (total organic carbon – TOC – and pyrolysis Rock-Eval) and inorganic geochemistry (X-ray fluoroescence). A new spore species is introduced: Rugulatisporites claudiae sp. nov. Three palynofacies are defined throughout the unit. The uppermost horizons, P1, fluvial in origin, include low TOC contents, a kerogen Type III, mostly terrigenous-derived, and a relatively diverse miospore assemblage largely dominated by disaccate pollen grains of umkomasiaceous/ peltasperm affinity; the K/Rb ratio is high, V is scarce, and Mo is absent. The middle, lacustrine section, P2, includes relatively high TOC values, a mostly amorphous rich kerogen Type II, and abundant Botryococcus sp.; the K/Rb ratio is relatively low, V is high, and Mo is present. The kerogen at the basalmost horizon, P3, is similar to the uppermost section, but includes relatively high percentages of amorphous organic matter and Botryococcus sp.; the K/Rb ratio is the lowest of the section, V is relatively low, and Mo is absent. The kerogen from the lacustrine P2 exhibits a moderate hydrocarbon genetic potential (ca. 3 to 31 kg HC/ ton). doi: 10.5710/AMGH.31.05.2019.3247

Published

2019-11-15

How to Cite

Ottone, E. G., Macino, J., Erra, G., Barredo, S., & Larriestra, F. (2019). PALYNOLOGY, PALYNOFACIES AND GEOCHEMISTRY ON THE TRIASSIC CASA PIEDRA FORMATION, RINCÓN BLANCO GROUP, ARGENTINE PRECORDILLERA: DEPOSITIONAL ENVIRONMENT AND HYDROCARBON POTENTIAL. Ameghiniana, 56(4), 319-335. Retrieved from https://ameghiniana.org.ar/index.php/ameghiniana/article/view/3247

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