Artículo

Limarino, C.O.; Passalia, M.G.; Llorens, M.; Vera, E.I.; Loinaze, V.S.P.; Césari, S.N. "Depositional environments and vegetation of Aptian sequences affected by volcanism in Patagonia" (2012) Palaeogeography, Palaeoclimatology, Palaeoecology. 323-325:22-41
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Abstract:

The continental deposits of the Baqueró Group preserve one of the most abundant Aptian floras on the southern margins of Gondwana. These floras represent an extinct biome that was subject to increasing regional volcanism. In combination with the presence of shallow water bodies, this biome provided suitable environments for the preservation of imprints and compressions of foliage together with permineralized trunks and palynofloras. Eight facies associations were identified in nine sections, characterizing the evolution of lacustrine and fluvial environments under intense volcanic activity. In addition, three depositional sequences were defined, with the purpose of establishing a chronostratigraphic framework to which the positions of the fossiliferous levels identified in the different sections can be referred. A 206 Pb/ 238 U age of 114.67±0.18Ma from the upper depositional sequence constrains the succession as no younger than the late Aptian and probably represents an interval of 4-5Myr, during which the vegetation was affected by increasing biotic stress conditions. A qualitative analysis of the palynological assemblages and plant remains allowed a reconstruction of the dynamics of the vegetation developed during the deposition of the Baqueró Group. Volcanic activity appears to have had relatively moderate effects on the biota, at least at the Order level. Nevertheless, low species richness is observed toward the top of the Baqueró Group, reflecting an increase in adverse environmental conditions. The possible interpretations of the assemblages identified as biozones or, in contrast, biofacies related to changeable environmental conditions are discussed herein. © 2012 Elsevier B.V.

Registro:

Documento: Artículo
Título:Depositional environments and vegetation of Aptian sequences affected by volcanism in Patagonia
Autor:Limarino, C.O.; Passalia, M.G.; Llorens, M.; Vera, E.I.; Loinaze, V.S.P.; Césari, S.N.
Filiación:Departamento de Geología, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, (1428) Buenos Aires, Argentina
Instituto de Investigaciones en Biodiversidad y Medioambiente, CONICET-UNCo, Quintral 1250. (R8400FRF) S.C. de Bariloche, Argentina
Comisión Nacional de Energía Atómica, Regional Patagonia, 26 de Noviembre s/n o, (9100) Trelew, Argentina
Museo Argentino de Ciencias Naturales B. Rivadavia, Av. Ángel Gallardo 470., (C1405DJR) Buenos Aires, Argentina
Palabras clave:Aptian; Baqueró Group; Macroflora; Palynology; Patagonia; Sequence stratigraphy; age determination; Aptian; biofacies; biome; biozonation; chronostratigraphy; depositional environment; environmental conditions; extinction; Gondwana; paleobotany; paleoecology; paleoenvironment; palynology; preservation; reconstruction; sequence stratigraphy; species richness; vegetation dynamics; vegetation history; volcanism; Patagonia
Año:2012
Volumen:323-325
Página de inicio:22
Página de fin:41
DOI: http://dx.doi.org/10.1016/j.palaeo.2012.01.021
Título revista:Palaeogeography, Palaeoclimatology, Palaeoecology
Título revista abreviado:Palaeogeogr. Palaeoclimatol. Palaeoecol.
ISSN:00310182
CODEN:PPPYA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00310182_v323-325_n_p22_Limarino

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Citas:

---------- APA ----------
Limarino, C.O., Passalia, M.G., Llorens, M., Vera, E.I., Loinaze, V.S.P. & Césari, S.N. (2012) . Depositional environments and vegetation of Aptian sequences affected by volcanism in Patagonia. Palaeogeography, Palaeoclimatology, Palaeoecology, 323-325, 22-41.
http://dx.doi.org/10.1016/j.palaeo.2012.01.021
---------- CHICAGO ----------
Limarino, C.O., Passalia, M.G., Llorens, M., Vera, E.I., Loinaze, V.S.P., Césari, S.N. "Depositional environments and vegetation of Aptian sequences affected by volcanism in Patagonia" . Palaeogeography, Palaeoclimatology, Palaeoecology 323-325 (2012) : 22-41.
http://dx.doi.org/10.1016/j.palaeo.2012.01.021
---------- MLA ----------
Limarino, C.O., Passalia, M.G., Llorens, M., Vera, E.I., Loinaze, V.S.P., Césari, S.N. "Depositional environments and vegetation of Aptian sequences affected by volcanism in Patagonia" . Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 323-325, 2012, pp. 22-41.
http://dx.doi.org/10.1016/j.palaeo.2012.01.021
---------- VANCOUVER ----------
Limarino, C.O., Passalia, M.G., Llorens, M., Vera, E.I., Loinaze, V.S.P., Césari, S.N. Depositional environments and vegetation of Aptian sequences affected by volcanism in Patagonia. Palaeogeogr. Palaeoclimatol. Palaeoecol. 2012;323-325:22-41.
http://dx.doi.org/10.1016/j.palaeo.2012.01.021