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Pankhurst, R.J.; Rapela, C.W.; Caminos, R.; Llambias, E.; Parica, C. "a revised age for the granites of the central Somuncura Batholith, North Patagonian Massif" (1992) Journal of South American Earth Sciences. 5(3-4):321-325
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Abstract:

The age of the granites of the La Esperanza region of the Somuncura Batholith, North Patagonian Massif has been revised, based in part on RbSr whole-rock data obtained by reanalyzing samples from a previous study. The new ages are 258 ± 15 Ma for the Prieto Granodiorite and 259 ± 16 Ma for the Donosa Granite, both from the older La Esperanza plutonic complex, and 239 ± 4 Ma for the Calvo Granite, from the younger volcano-plutonic Dos Lomas complex. The initial 87Sr/86Sr ratios are all in the range 0.7070-0.7076. The ages probably correspond stratigraphically to Late Permian and Early Triassic for the two complexes, respectively, consistent with traditional geologic interpretation. Together with recently published Triassic ages from the Batholith of Central Patagonia, it is clear that the acidic volcano-plutonic associations of northern Patagonia are very latest Paleozoic and Mesozoic in age. They are not obviously related to terrane collision but are part of a Permo-Triassic acid magmatic province that extends throughout the central Andes and that preceded, or was associated with, the early rifting of Gondwana. © 1982.

Registro:

Documento: Artículo
Título:a revised age for the granites of the central Somuncura Batholith, North Patagonian Massif
Autor:Pankhurst, R.J.; Rapela, C.W.; Caminos, R.; Llambias, E.; Parica, C.
Filiación:British Antarctic Survey, NERC Isotope Geosciences Laboratory, Kingsley Dunham Centre, Keyworth, Nottingham, NG12 5GG, United Kingdom
Secretaría de Minería, Santa Fé 1548, Piso 12, 1060 Buenos Aires, Argentina
Centro de Investigaciones Geológicas, 644 Calle No. 1, 1900 La Plata, Argentina
INGEIS, Pabellon 2, Ciudad Universitaria, 1428 Buenos Aires, Argentina, Argentina
Palabras clave:Gondwana; granite; Permian; rifting; rubidium/strontium dating; Triassic; South America, North Patagonia, Somuncura
Año:1992
Volumen:5
Número:3-4
Página de inicio:321
Página de fin:325
DOI: http://dx.doi.org/10.1016/0895-9811(92)90029-X
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_v5_n3-4_p321_Pankhurst

Referencias:

  • Brook, Pankhurst, Shepherd, Spiro, ANDCHRON: Andean Geochronology and Metallogenesis, 1983–1986 (1986) Overseas Development Agency Open File Report, p. 137. , British Geological Survey, Keyworth, UK
  • Caminos, Llambías, Rapela, Parica, Late Paleozoic-Early Triassic magmatic activity of Argentina and the significance of new RbSr ages from northern Patagonia (1988) Journal of South American Earth Sciences, 1 (2), pp. 137-145
  • Cingolani, Dalla Salda, Hervé, Munizaga, Pankhurst, Parada, Rapela, The geological evolution of northern Patagonia: New impressions of pre-Andean and Andean tectonics (1991) Andean Magmatism and Its Tectonic Setting, 265, pp. 29-45. , R.S. Harmon, C.W. Rapela, Geological Society of America, Special Publication
  • Groeber, Lineas Fundamentales de la Geología del Neuquén, Sur de Mendoza y Regiones Adyacentes (1929) Dirección de Minas, Geología y Hidrogeología, Buenos Aires, Publicación, 58, p. 109
  • Llambías, Rapela, Geología de los complejos eruptivos del Paleozoico superior de La Esperanza, provincia de Río Negro (1984) Revista de la Associacíon Geológica Argentina, 40 (1-2), pp. 4-25
  • Munizaga, Hervé, Drake, Pankhurst, Brook, Snelling, Geochronology of the Lake Region of south-central Chile (39–42°S): Preliminary results (1988) Journal of South American Earth Sciences, 1 (3), pp. 309-316
  • Pankhurst, O'Nions, Determination of Rb/Sr and 87Sr/86Sr ratios of some standard rocks and evaluation of X-ray fluorescence in RbSr geochemistry (1973) Chemical Geology, 12 (2), pp. 127-136
  • Pankhurst, Hervé, Rojas, Cembrano, Magmatism and tectonics in Continental Chiloé, Chile (42°–42°′S.) (1992) Tectonophysics, 205 (1-3), pp. 283-294
  • Ramos, Patagonia: Un continente Paleozoico a la deriva? (1984) Actas, IX Congreso Geológico Argentino, San Carlos de Bariloche, 2, pp. 311-325
  • Rapela, Pankhurst, Harrison, Triassic “Gondwana” granites of the Gastre district, North Patagonian Massif (1992) Transactions of the Royal Society of Edinburgh: Earth Sciences, 83, pp. 291-304
  • [co-published as: Second Hutton Symposium on the Origins of Granites (edited by P. E. Brown and B. W. Chappell). Geological Society of America, Special Paper 272, 291–304]; Stipanicic, Consideraciones sobre las edades de algunas fases magmáticas del Neopaleozoico y Mesozoico (1967) Revista de la Asociación Geológica Argentina, 22 (2), pp. 101-133
  • Williamson, Least-squares fitting of a straight line (1968) Canadian Journal of Physics, 46, pp. 1845-1847

Citas:

---------- APA ----------
Pankhurst, R.J., Rapela, C.W., Caminos, R., Llambias, E. & Parica, C. (1992) . a revised age for the granites of the central Somuncura Batholith, North Patagonian Massif. Journal of South American Earth Sciences, 5(3-4), 321-325.
http://dx.doi.org/10.1016/0895-9811(92)90029-X
---------- CHICAGO ----------
Pankhurst, R.J., Rapela, C.W., Caminos, R., Llambias, E., Parica, C. "a revised age for the granites of the central Somuncura Batholith, North Patagonian Massif" . Journal of South American Earth Sciences 5, no. 3-4 (1992) : 321-325.
http://dx.doi.org/10.1016/0895-9811(92)90029-X
---------- MLA ----------
Pankhurst, R.J., Rapela, C.W., Caminos, R., Llambias, E., Parica, C. "a revised age for the granites of the central Somuncura Batholith, North Patagonian Massif" . Journal of South American Earth Sciences, vol. 5, no. 3-4, 1992, pp. 321-325.
http://dx.doi.org/10.1016/0895-9811(92)90029-X
---------- VANCOUVER ----------
Pankhurst, R.J., Rapela, C.W., Caminos, R., Llambias, E., Parica, C. a revised age for the granites of the central Somuncura Batholith, North Patagonian Massif. J. South Am. Earth Sci. 1992;5(3-4):321-325.
http://dx.doi.org/10.1016/0895-9811(92)90029-X