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Abstract:

Variations in the sedimentary organic matter were documented throughout the Agua de la Mula Member (late Hauterivian) of the Agrio Formation, at a combined section in the type area of the Agrio Formation; the base at Agrio del Medio and the middle to top at Bajada del Agrio. A main organic-rich interval was identified in the basal Agua de la Mula Member, dominated by marine-derived Amorphous Organic Matter (AOM), coinciding with the highest Total Organic Carbon (TOC) content, between 1.4 and 3.8 wt.%, suggesting dysoxic conditions. The rest of the Member is predominantly characterized by terrestrially-derived organic matter, mainly phytoclasts, with low TOC values, around 1% or lower, indicating predominantly oxic depositional settings. By integrating stacking pattern and shell beds analysis, four depositional sequences SQ1-SQ4 were recognized. The organic-rich, finely laminated bituminous black shales of the Spitidiscus riccardii zone constitute a mayor and rapid inundation defining a Transgressive System tract (TST), related to a third order asymmetrical mesosequence dominated by a thick High System Tract (HST). It represents the most widespread and important flooding episode within the Neuquén Basin during the late Hauterivian. Inside sequences of higher frequency (SQ1, SQ2, SQ3, SQ4) of probably fourth order were recognized and analysed including several ammonids zones (Spitidiscus riccardii, Crioceratites schlagintweiti, C. diamantensis and Paraspiticeras groeberi). With the exception of the oxygen-controlled, basinal and outer ramp settings indicated for the TST1, which is equivalent to the TST of a lower order sequence, and the lower TST2, respectively, the prevalence of well oxygenated, inner to middle ramp depositional environments, is suggested for the rest of the sedimentary succession and emphasized in HST of SQ2, SQ3 and SQ4. Thus, a shallowing-upward trend with improved oxygenation is recorded through the Agua de la Mula Member, reflected by decreasing TOC, AOM content and preservation state of the organic matter. Based on the whole rock fluorescence analysis of the two selected organic-rich intervals from the Spitidiscus riccardii and the lowermost Crioceratites diamantensis zones, the presence of hydrocarbons suggests a very early in situ generation. © 2012 Elsevier Ltd.

Registro:

Documento: Artículo
Título:Palynofacies analysis and palynology of the Agua de la Mula Member (Agrio Formation) in a sequence stratigraphy framework, Lower Cretaceous, Neuquén Basin, Argentina
Autor:Guler, M.V.; Lazo, D.G.; Pazos, P.J.; Borel, C.M.; Ottone, E.G.; Tyson, R.V.; Cesaretti, N.; Aguirre-Urreta, M.B.
Filiación:Departamento de Geología, Instituto Geológico del Sur, Universidad Nacional de Sur, San Juan 670, 8000 Bahía Blanca, Argentina
Instituto de Estudios Andinos Don Pablo Groeber, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Getech, Elmete Hall, Elmete Lane, Leeds LS8 2LJ, United Kingdom
Consejo Nacional de Investigaciones Científicas y Técnicas, Av. Rivadavia 1917, C1033AAJ Buenos Aires, Argentina
Palabras clave:Agrio Formation; Argentina; Lower Cretaceous; Neuquén Basin; Palynofacies; Palynology; ammonite; black shale; depositional environment; depositional sequence; Hauterivian; organic matter; oxic conditions; palynology; sequence stratigraphy; total organic carbon; Argentina; Neuquen Basin
Año:2013
Volumen:41
Página de inicio:65
Página de fin:81
DOI: http://dx.doi.org/10.1016/j.cretres.2012.10.006
Título revista:Cretaceous Research
Título revista abreviado:Cretaceous Res.
ISSN:01956671
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01956671_v41_n_p65_Guler

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Citas:

---------- APA ----------
Guler, M.V., Lazo, D.G., Pazos, P.J., Borel, C.M., Ottone, E.G., Tyson, R.V., Cesaretti, N.,..., Aguirre-Urreta, M.B. (2013) . Palynofacies analysis and palynology of the Agua de la Mula Member (Agrio Formation) in a sequence stratigraphy framework, Lower Cretaceous, Neuquén Basin, Argentina. Cretaceous Research, 41, 65-81.
http://dx.doi.org/10.1016/j.cretres.2012.10.006
---------- CHICAGO ----------
Guler, M.V., Lazo, D.G., Pazos, P.J., Borel, C.M., Ottone, E.G., Tyson, R.V., et al. "Palynofacies analysis and palynology of the Agua de la Mula Member (Agrio Formation) in a sequence stratigraphy framework, Lower Cretaceous, Neuquén Basin, Argentina" . Cretaceous Research 41 (2013) : 65-81.
http://dx.doi.org/10.1016/j.cretres.2012.10.006
---------- MLA ----------
Guler, M.V., Lazo, D.G., Pazos, P.J., Borel, C.M., Ottone, E.G., Tyson, R.V., et al. "Palynofacies analysis and palynology of the Agua de la Mula Member (Agrio Formation) in a sequence stratigraphy framework, Lower Cretaceous, Neuquén Basin, Argentina" . Cretaceous Research, vol. 41, 2013, pp. 65-81.
http://dx.doi.org/10.1016/j.cretres.2012.10.006
---------- VANCOUVER ----------
Guler, M.V., Lazo, D.G., Pazos, P.J., Borel, C.M., Ottone, E.G., Tyson, R.V., et al. Palynofacies analysis and palynology of the Agua de la Mula Member (Agrio Formation) in a sequence stratigraphy framework, Lower Cretaceous, Neuquén Basin, Argentina. Cretaceous Res. 2013;41:65-81.
http://dx.doi.org/10.1016/j.cretres.2012.10.006