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Título: The role of Telogenetic Injection of Magmatically Derived CO2 in the formation of Dawsonite from the Castillo Formation, Chubut Group, Patagonia Argentina
Autor(es): Comerio, Marcos
Morosi, Martin E.
Tunik, Maisa A.
Paredes, José M.
Zalba, Patricia E.
Fecha de publicación: jun-2014
Editorial: Mineralogical Assoc Canada
Citación: Comerio, Marcos., Morosi, Martin E., Tunik, Maisa A., Paredes, José M., Zalba, Patricia E. (2014). The role of Telogenetic Injection of Magmatically Derived CO2 in the formation of Dawsonite from the Castillo Formation, Chubut Group, Patagonia Argentina. Mineralogical Assoc Canada; Canadian Mineralogist; 52 (3); 513-531
Revista: Canadian Mineralogist
Resumen: We report the occurrence of dawsonite, NaAlCO3(OH)2, in volcaniclastic rocks of the Albian hydrocarbon reservoir Castillo Formation, Golfo San Jorge Basin, neighboring the Cañadón Asfalto Basin in Patagonia; this is the first known occurrence in Argentina. Dawsonite replaces crystals pseudomorphically, and can also be found as a cement together with other carbonates, which induced a loss in the porosity of the host rock. Previous studies reported incomplete chemical reactions which suggested that oligoclase and analcime were dawsonite precursors. In the present work we document either totally achieved or incomplete chemical reactions which led to the transformation of analcime into kaolinite and dawsonite into kaolinite, respectively. These facts allowed us to deduce that the transformation of analcime into kaolinite was via dawsonite, minerals formed during different stages under a telogenetic regime. Dawsonite values of δ13C PDB (−0.1 to 1.5‰) are consistent with a magmatic source of CO2 provided by hypabyssal, basic alkaline igneous rocks of regional importance starting in the Eocene. We identify both internal and external sources of Na and Al used in the formation of dawsonite.
URI: https://pubs.geoscienceworld.org/canmin/article-abstract/52/3/513/127596/THE-ROLE-OF-TELOGENETIC-INJECTION-OF-MAGMATICALLY?redirectedFrom=fulltext
https://rid.unrn.edu.ar/jspui/handle/20.500.12049/5344
Identificador DOI: https://doi.org/10.3749/canmin.52.3.513
ISSN: 0008-4476
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Este documento es resultado del financiamiento otorgado por el Estado Nacional, por lo tanto queda sujeto al cumplimiento de la Ley N° 26.899