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Abstract:

The orogenic front at 37°S has been mainly formed through at least two contraccional stages, as inferred from the exhumed major angular unconformities at the Late Eocene and the Late Miocene times respectively. A Late Cretaceous event is restricted to the hinterland zones in the Main Cordillera. A series of syntectonic sedimentary packages, that thin to the east is identified through a detailed description of the cannibalized westernmost Neogene foreland basin associated with the Sierra de Reyes. Their detrital microscopic and macroscopic descriptions reveal that the Neogene basin was fed from the west and particularly from the eastern Sierra de Reyes slope at the time of mountain incision. Detrital composition of the upper section reveals that a metamorphic component is present, implying that a domain further east has been exhumed, and therefore that the westernmost foreland basin has been cannibalized. This also implies that exhumation previous to Miocene times should have been minimum in the area, since the Neogene succession represents a complete unroofing. The structural cross sections show Neogene shortening of about 20%, leaving in comparison Eocene contraction as negligible.

Registro:

Documento: Artículo
Título:Mountain building processes at the orogenic front. A study of the unroofing in Neogene foreland sequence (37°S)
Autor:Sagripanti, L.; Bottesi, G.; Kietzmann, D.; Folguera, A.; Ramos, V.A.
Filiación:Laboratorio de Tectónica Andina, Instituto de Estudios Andinos Don Pablo Groeber (UBA-CONICET), Intendente Güiraldes 2160, Ciudad Universitaria, C1428EGA, Capital Federal, Buenos Aires, Argentina
YPF, S.A, Bv. Macacha Güemes y Av. J. Manso (Parcela 5L-1 y 2), Puerto Madero, Capital Federal, Buenos Aires, Argentina
Palabras clave:Argentina; Central Andes; Foreland basin; Malargüe fold and thrust belt; Synorogenic deposits; exhumation; fold and thrust belt; foreland basin; mountain; Neogene; orogeny; syntectonic sediment; unconformity; unroofing; Andes; Argentina; Cordillera; Paraguay
Año:2012
Volumen:39
Número:2
Página de inicio:201
Página de fin:219
Título revista:Andean Geology
Título revista abreviado:Andean Geol.
ISSN:07187092
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v39_n2_p201_Sagripanti

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Citas:

---------- APA ----------
Sagripanti, L., Bottesi, G., Kietzmann, D., Folguera, A. & Ramos, V.A. (2012) . Mountain building processes at the orogenic front. A study of the unroofing in Neogene foreland sequence (37°S) . Andean Geology, 39(2), 201-219.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v39_n2_p201_Sagripanti [ ]
---------- CHICAGO ----------
Sagripanti, L., Bottesi, G., Kietzmann, D., Folguera, A., Ramos, V.A. "Mountain building processes at the orogenic front. A study of the unroofing in Neogene foreland sequence (37°S) " . Andean Geology 39, no. 2 (2012) : 201-219.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v39_n2_p201_Sagripanti [ ]
---------- MLA ----------
Sagripanti, L., Bottesi, G., Kietzmann, D., Folguera, A., Ramos, V.A. "Mountain building processes at the orogenic front. A study of the unroofing in Neogene foreland sequence (37°S) " . Andean Geology, vol. 39, no. 2, 2012, pp. 201-219.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v39_n2_p201_Sagripanti [ ]
---------- VANCOUVER ----------
Sagripanti, L., Bottesi, G., Kietzmann, D., Folguera, A., Ramos, V.A. Mountain building processes at the orogenic front. A study of the unroofing in Neogene foreland sequence (37°S) . Andean Geol. 2012;39(2):201-219.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v39_n2_p201_Sagripanti [ ]