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Abstract:

The upper Paleozoic rocks of Gondwana record a complex paleoclimatic history related to the migration of the supercontinent over high latitudes. Changes in climate and relative sea level can be traced through detailed sedimentologic and sequence-stratigraphic analysis. Our study focuses on transgressive deposits of Stephanian-Early Permian age in the lower member of the Tupe Formation with the objective of characterizing lithofacies and sedimentary environments within a sequence-stratigraphic framework in order to achieve a better understanding of the sedimentary history of the Paganzo Basin and the nature of transgressive deposits. Sixteen lithofacies grouped in eight assemblages were defined and arranged in two complete sequences. A sequence boundary (SB) is identified at the base of the Tupe Formation. Coastal-plain deposits capped by marine embayment lithofacies are included within sequence 1. A relative sea-level fall (SB) is recorded by an abrupt change into braided alluvial-plaine deposits (LST). The beginning of the TST is characterized by the appearance of coal and deltaic lithofacies. Late TST deposits occur above a ravinement surface and comprise bay-margin to distal-bay deposits forming a retrogradational stacking package. These lithofacies are replaced upwards by HST deposits. A relative sea-level fall (SB) is recorded by the presence of fluvial deposits overlying marine lithofacies. The Tupe Formation illustrates the transition of a coastal-plain to a marine embayment. The detection of a transgressive surface within the coastal-plain deposits of sequence 1 expanded significantly the volume of deposits now included as part of the latest Carboniferous-earliest Permian transgression, and underscores the importance of searching for transgressive signatures in non-marine environments. The presence of two sequences supports a punctuated shoreline trajectory with an overall retrogradational stacking pattern. An abrupt relative sea-level fall and increased aridity is recorded at the end of the transgressive event. © 2008 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Latest Carboniferous-earliest Permian transgressive deposits in the Paganzo Basin of western Argentina: Lithofacies and sequence stratigraphy of a coastal-plain to bay succession
Autor:Desjardins, P.R.; Buatois, L.A.; Limarino, C.O.; Cisterna, G.A.
Filiación:Department of Geological Sciences, University of Saskatchewan, Sask. S7N 5E2, Canada
CONICET, Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Pabellon 2, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
CONICET, Fundación Miguel Lillo, Miguel Lillo 251, 4000 San Miguel de Tucumán, Argentina
Palabras clave:Late Paleozoic; Paganzo Basin; Sequence stratigraphy; Transgression; Tupe Formation; Carboniferous; coastal plain; Gondwana; lithofacies; paleoclimate; Permian; sequence boundary; sequence stratigraphy; Stephanian; transgression; Argentina; Paganzo Basin; South America
Año:2009
Volumen:28
Número:1
Página de inicio:40
Página de fin:53
DOI: http://dx.doi.org/10.1016/j.jsames.2008.10.003
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v28_n1_p40_Desjardins

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Citas:

---------- APA ----------
Desjardins, P.R., Buatois, L.A., Limarino, C.O. & Cisterna, G.A. (2009) . Latest Carboniferous-earliest Permian transgressive deposits in the Paganzo Basin of western Argentina: Lithofacies and sequence stratigraphy of a coastal-plain to bay succession. Journal of South American Earth Sciences, 28(1), 40-53.
http://dx.doi.org/10.1016/j.jsames.2008.10.003
---------- CHICAGO ----------
Desjardins, P.R., Buatois, L.A., Limarino, C.O., Cisterna, G.A. "Latest Carboniferous-earliest Permian transgressive deposits in the Paganzo Basin of western Argentina: Lithofacies and sequence stratigraphy of a coastal-plain to bay succession" . Journal of South American Earth Sciences 28, no. 1 (2009) : 40-53.
http://dx.doi.org/10.1016/j.jsames.2008.10.003
---------- MLA ----------
Desjardins, P.R., Buatois, L.A., Limarino, C.O., Cisterna, G.A. "Latest Carboniferous-earliest Permian transgressive deposits in the Paganzo Basin of western Argentina: Lithofacies and sequence stratigraphy of a coastal-plain to bay succession" . Journal of South American Earth Sciences, vol. 28, no. 1, 2009, pp. 40-53.
http://dx.doi.org/10.1016/j.jsames.2008.10.003
---------- VANCOUVER ----------
Desjardins, P.R., Buatois, L.A., Limarino, C.O., Cisterna, G.A. Latest Carboniferous-earliest Permian transgressive deposits in the Paganzo Basin of western Argentina: Lithofacies and sequence stratigraphy of a coastal-plain to bay succession. J. South Am. Earth Sci. 2009;28(1):40-53.
http://dx.doi.org/10.1016/j.jsames.2008.10.003