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Abstract:

The Agua Colorada Formation crops out in the Famatina System (northwestern Argentina) and is composed of sandstones, conglomerates, mudstones, some coal seams, and diamictites. The diamictites are not abundant in the formation, but they form thick beds in the lower member. The diamictites are divided into two major genetic types; the first is interpreted as resedimented lacustrine diamictites and therefore is not considered a tillite. The massive diamictites included in the second type are considered true tillites. The principal features that suggest a glacial origin are: 1) very poor sorting; 2) small grain size (clay to very fine sand) of the matrix; 3) massive bedding; 4) existence of faceted and striated clasts; and 5) very close relationship with lacustrine sequences containing dropstones. According to Eyles' methodology, several lithofacies have been recognized in the diamictites of the Las Gredas locality: Dmm, Dcm, Dcs, and Dcg. Dmm (matrix-supported massive diamictites) and Dcm (clast-supported massive) are the most frequent and very probably represent tillitic deposits. The Dcs (clast-supported stratified) and Dcg (clast-supported graded) lithofacies are interpreted as originated by slides and gravity flows. The finding of a rich palynological assemblage obtained in lacustrine deposits (closely associated with the diamictites) allows the dating of the glacial event as early Late Carboniferous. This age is based on the presence of diagnostic cosmopolitan taxa together with monosaccate pollen grains. © 1990.

Registro:

Documento: Artículo
Título:Diamictites in the Agua Colorada Formation (northwestern Argentina): New evidence of Carboniferous glaciation in South America
Autor:Limarino, C.; Gutierrez, P.
Filiación:Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Departamento Geología, Pabellon II, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Palabras clave:Agua Colorado Formation; Carboniferous; diamictite; Famatina System; glaciation; tillite; Argentina
Año:1990
Volumen:3
Número:1
Página de inicio:9
Página de fin:20
DOI: http://dx.doi.org/10.1016/0895-9811(90)90014-R
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_v3_n1_p9_Limarino

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Citas:

---------- APA ----------
Limarino, C. & Gutierrez, P. (1990) . Diamictites in the Agua Colorada Formation (northwestern Argentina): New evidence of Carboniferous glaciation in South America. Journal of South American Earth Sciences, 3(1), 9-20.
http://dx.doi.org/10.1016/0895-9811(90)90014-R
---------- CHICAGO ----------
Limarino, C., Gutierrez, P. "Diamictites in the Agua Colorada Formation (northwestern Argentina): New evidence of Carboniferous glaciation in South America" . Journal of South American Earth Sciences 3, no. 1 (1990) : 9-20.
http://dx.doi.org/10.1016/0895-9811(90)90014-R
---------- MLA ----------
Limarino, C., Gutierrez, P. "Diamictites in the Agua Colorada Formation (northwestern Argentina): New evidence of Carboniferous glaciation in South America" . Journal of South American Earth Sciences, vol. 3, no. 1, 1990, pp. 9-20.
http://dx.doi.org/10.1016/0895-9811(90)90014-R
---------- VANCOUVER ----------
Limarino, C., Gutierrez, P. Diamictites in the Agua Colorada Formation (northwestern Argentina): New evidence of Carboniferous glaciation in South America. J. South Am. Earth Sci. 1990;3(1):9-20.
http://dx.doi.org/10.1016/0895-9811(90)90014-R