INVESTIGADORES
SAGRIPANTI Lucia
artículos
Título:
Exhumation of the Neuquén Basin in the southern Central Andes (Malargüe fold and thrust belt) fromfield data and low-temperature thermochronology
Autor/es:
ANDRÉS FOLGUERA; BOTTESI GERMÁN; DUDDY I; MARTÍN-GONZALEZ F; DARÍO ORTS; LUCÍA SAGRIPANTI; EMILIO ROJAS VERA; VICTOR A. RAMOS
Revista:
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2015
ISSN:
0895-9811
Resumen:
Apatite-fission-track analysis performed on eighteen Mesozoic sediment samples of the Neuqu en Basin from the Southern Central Andes orogenic front between 35º30 and 37ºS has revealed CampanianPaleocene (75-55 Ma), late Eocene-early Oligocene (35-30 Ma) and middle Miocene (15-10 Ma) cooling episodes. Each cooling episode corresponds closely with major unconformities observed in the preserved sedimentary sequences, and is associated with kilometer-scale additional burial and subsequent exhumation. A similar degree of cooling is inferred from associated vitrinite reflectance data. Late Eocene-early Oligocene exhumation is recognized only near the eastern orogenic front adjacent to the foreland in the southernmost part of the study area and may be related partly to within-plate magmatism and associated extension in the Palaoco Basin. The Campanian-Paleocene and middle Miocene cooling episodes are recognized more widely in the fold and thrust belt and appear to coincide with periods of eastward arc expansion and mountain building processes.
