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Abstract:

Small outcrops of biotitic-amphibolic schists and amphibolites found in two localities suggest that the Cushamen Formation is host rock of the Central Patagonian Batholith in Gastre. The characteristics of these rocks were investigated using structural, petrographic, magnetic fabric, and garnet chemical-zonation studies. Garnet is observed as a late product of contact metamorphism. Structural data from the studied area and from other localities in the region are in conflict with models that invoke the occurrence of uniform, large-scale dextral displacements along the Gastre lineament in Mesosoic times. Rather, the data suggest that the Gastre granitoids record heterogeneous low-temperature deformation of likely Late Triassic age. This low-temperature deformation appears as small, localized outcrops, and we suggest that it is related to the accommodation of the successive magma batches that built the Central Patagonian Batholith.

Registro:

Documento: Artículo
Título:The host rock of the central Patagonian batholith in Gastre: Further insights on the late Triassic to early Jurassic deformation in the region
Autor:Zaffarana, C.B.; Montenegro, T.; Somoza, R.
Filiación:Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
Palabras clave:Basement rocks; Central patagonian batholith; Garnet zonation; Gastre; Gastre fault system; North-patagonian massif; amphibolite; basement rock; batholith; biotite; deformation mechanism; displacement; fault zone; garnet; Jurassic; low temperature; schist; structural geology; Triassic; Argentina; Chubut; Cushamen; Patagonia
Año:2012
Volumen:69
Número:1
Página de inicio:106
Página de fin:126
Título revista:Revista de la Asociacion Geologica Argentina
Título revista abreviado:Rev. Asoc. Geol. Argent.
ISSN:00044822
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00044822_v69_n1_p106_Zaffarana.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v69_n1_p106_Zaffarana

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Citas:

---------- APA ----------
Zaffarana, C.B., Montenegro, T. & Somoza, R. (2012) . The host rock of the central Patagonian batholith in Gastre: Further insights on the late Triassic to early Jurassic deformation in the region . Revista de la Asociacion Geologica Argentina, 69(1), 106-126.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v69_n1_p106_Zaffarana [ ]
---------- CHICAGO ----------
Zaffarana, C.B., Montenegro, T., Somoza, R. "The host rock of the central Patagonian batholith in Gastre: Further insights on the late Triassic to early Jurassic deformation in the region " . Revista de la Asociacion Geologica Argentina 69, no. 1 (2012) : 106-126.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v69_n1_p106_Zaffarana [ ]
---------- MLA ----------
Zaffarana, C.B., Montenegro, T., Somoza, R. "The host rock of the central Patagonian batholith in Gastre: Further insights on the late Triassic to early Jurassic deformation in the region " . Revista de la Asociacion Geologica Argentina, vol. 69, no. 1, 2012, pp. 106-126.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v69_n1_p106_Zaffarana [ ]
---------- VANCOUVER ----------
Zaffarana, C.B., Montenegro, T., Somoza, R. The host rock of the central Patagonian batholith in Gastre: Further insights on the late Triassic to early Jurassic deformation in the region . Rev. Asoc. Geol. Argent. 2012;69(1):106-126.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v69_n1_p106_Zaffarana [ ]