Artículo

El editor solo permite decargar el artículo en su versión post-print desde el repositorio. Por favor, si usted posee dicha versión, enviela a
Consulte el artículo en la página del editor
Consulte la política de Acceso Abierto del editor

Abstract:

Middle Jurassic volcanism is a major magmatic event in the evolution of Patagonia. In the southwestern corner of the North Patagonian Massif at Sierra de Mamil Choique, basic to intermediate, ca. 170 Ma dykes are widespread. In this article, new chemical data from the dykes are presented, analyzed, and compared with regional information about Jurassic volcanism. The dyke swarms are composed of an alkaline and a subalkaline series. Fractionating phases that controlled the magmatic evolution were plagioclase (andesine) + clinopyroxene with clinoamphibole (for compositions of SiO2 > 60%) in the subalkaline series and clinoamphibole + plagioclase (oligoclase) ± magnetite in the alkaline series. The source of both series could be an enriched lithospheric mantle or lower crust. Although crustal contamination or enrichment by subduction-derived fluids cannot be demonstrated from the available data, a subduction-enrichment process of the magma source is suggested for the subalkaline rocks. Different volatile composition, water content and perhaps temperature at the melting site would control the higher Zr content of the alkaline series and would allow low melt fractions to leave their sources. Absolute values for Ba/Nb (60-160), La/Nb (4-5), and K/Nb (>2000) in both series indicate a significantly LIL-enriched crustal component. Nd/Th of approximately 4 for the alkaline rocks argues against a primitive mantle, supported by the low MgO, Cr, and Ni and high LILE contents. In contrast, Nd/Th between 15 and 27 in the subalkaline rocks is similar to a mantle source. Crustal components are indicated by the higher La/Yb and Na2O and lower CaO in the alkaline rocks. Regional, structural, and, to a certain extent, petrological evidence for the Middle Jurassic dyke swarms of the Sierra de Mamil Choique point to an extensional intracontinental tectonic setting in which older structures controlled the development of the volcanism. © 2002 Elsevier Science Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Middle Jurassic dyke swarms in the North Patagonian Massif: The Lonco trapial formation in the Sierra de Mamil Choique, Río Negro province, Argentina
Autor:López De Luchi, M.G.; Rapalini, A.E.
Filiación:Instituto de Geocronología y Geología Isotópica, Pabellon INGEIS, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Laboratorio de Paleomagnetismo, D.a. Valencio, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Palabras clave:Dyke swarms; Middle Jurassic; Patagonia; Petrology of basic to intermediate volcanism; dike swarm; geochemistry; magmatism; petrology; tectonic setting; volcanism; Argentina
Año:2002
Volumen:15
Número:6
Página de inicio:625
Página de fin:641
DOI: http://dx.doi.org/10.1016/S0895-9811(02)00083-4
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_v15_n6_p625_LopezDeLuchi

Referencias:

  • Alderton, D.M., Pearce, J., Potts, P.J., Rare earth element mobility during granite alteration: Evidence from southwest England (1980) Earth and Planetary Sciences Letters, 49, pp. 149-165
  • Alric, V.I., Haller, M.J., Féraud, G., Bertrand, H., Zubia, M., Cronología 40Ar/39Ar del Volcanismo Jurásico de la Patagonia Extrandina (1996) Actas 13th Congreso Geológico Argentino, 5, pp. 243-250
  • Aragón, E., Iníguez Rodríguez, A., Benialgo, A., A caldera field at the Marifil formation, new volcanogenic interpretation, North Patagonian Massif (1996) Journal of South America Earth Sciences, 9 (5-6), pp. 321-328
  • Aragón, E., González, P., Aguilera, Y., Cavarozzi, C., Llambías, E., Andesitas Alvar: Volcanismo alcalino jurásico en el área de Paso del Sapo, provincia de Chubut (2000) Revista de la Asociación Geológica Argentina, 55 (1-2), pp. 44-58
  • Bertrand, H., Féraud, G., Haller, M., Luais, B., Martínez, M., Alric, V., Fornari, M., The Mesozoic large igneous province of Patagonia: Chronology and origin evidenced by 40Ar/39Ar dating and Sr-Nd isotopes (1999) Actas Second South American Symposium on Isotope Geology, 24, pp. 167-169. , Servicio Geológico Minero Argentino, Anales
  • Cerredo, M.E., López de Luchi, M.G., Mamil Choique granitoids, SW North Patagonian Massif, Argentina: Magmatism and metamorphism associated with a polyphasic evolution (1998) Journal of South America Earth Sciences, 11 (5), pp. 499-515
  • Cortinas, J., La Cuenca de Somoncura-Canãdón Asfalto: sus límites, ciclos evolutivos del relleno sedimentario y posibilidades exploratorias (1996) Actas 13th Congreso Geológico Argentino, 1, pp. 147-163
  • Demichelis, A.H., Haller, M.J., Miller, H., Las vulcanitas jurásicas en los alrededores de Las Plumas (Chubut-Argentina): Interdigitación de unidades petrológicamente diferentes (1996) Actas 13th Congreso Geológico Argentino, 5, p. 241
  • Figari, E., Courtade, S., Evolución tectosedimentaria de la cuenca de Cañadón Asfalto, Chubut, Argentina (1993) Actas 12th Congreso Geológico Argentino, 1, pp. 66-77
  • Haller, M., (1981) Descripción geológica de la Hoja 43h, Puerto Madryn, Provincia del Chubut, 184, p. 41. , Servicio Geológico Nacional, Buenos Aires
  • Kay, S., Gorring, M., Evolution of the Patagonian mantle: Evidence from isotopic studies of Tertiary to Recent plateau lavas (1999) Actas II South American Symposium on Isotope Geology, 24, pp. 556-565. , Servicio Geológico Minero Argentino, Anales
  • Kay, S.M., Ramos, V.A., Mpodozis, C., Sruoga, P., Late Paleozoic to Jurassic silicic magmatism at the Gondwana margin: Analogy to the Middle Proterozoic in North America? (1989) Geology, 17, pp. 324-328
  • Kay, S.M., Mpodozis, C., Ramos, V., Munizaga, F., (1991) Magma Source Variations for Mid-late Tertiary Magmatic Rocks Associated with a Shallowing Subduction Zone and a Thickening Crust in the Central Andes (28-338S), 265, pp. 113-137. , Special Paper, Geological Society of America, Boulder, Colorado
  • Le Maitre, R.W., Bateman, P., Dudek, A., Keller Lameyre, J., Le Bas, M.J., Sabine, P.A., Schmid, R., Zanettin, B., (1989) A Classification of the Igneous Rocks and Glossary of Terms, , Blackwell, Oxford, 193 p
  • Lesta, P., Ferello, R., Región extrandina de Chubut y norte de Santa Cruz (1972) Geología Regional Argentina, pp. 601-654. , Leanza, A.F., (Ed.), Academia Nacional de Ciencias, Córdoba, Argentina
  • López de Luchi, M.G., Rapalini, A.E., Jurassic dyke swarms in the Sierra de Mamil Choique, North Patagonian Massif: Lithology, age and paleomagnetism (1997) Simposio Final IGCP Project 345, Lithospheric Evolution of the Andes, 3, pp. 1674-1679. , Actas 8th Congreso Geológico Chileno
  • López de Luchi, M.G., Rapalini, A.E., Basic to intermediate Middle Jurassic volcanism in the North Patagonian Massif: Dyke swarms of the Sierra de Mamil Choique (1999) Extended Abstracts Fourth International Symposium on Andean Geodynamics, pp. 441-445. , Göttingen
  • López de Luchi, M.G., Ostera, H.A., Cerredo, M.E., Linares, E., Haller, M.J., Cagnoni, M.C., Unravelling the ages of the crystalline basement at Sierra de Mamil Choique, Río Negro, Argentina (1999) Actas Second Simposio de Geología Isotópica, pp. 322-326
  • Morris, J., Hart, S., Isotopic and incompatible element constraints on the genesis of island arc volcanics (1983) Geochimica et Cosmochimica Acta, 47, pp. 2015-2030
  • Page, R., Page, S., Petrología y significado tectónico del Jurásico volcánico del Chubut Central (1993) Revista de la Asociación Geológica Argentina, 48, pp. 41-58
  • Pankhurst, R.J., Rapela, C.R., Production of Jurassic rhyolites by anatexis of the lower crust of Patagonia (1995) Earth and Planetary Science Letters, 134, pp. 23-36
  • Pankhurst, R.J., Sruoga, P., Rapela, C.W., Estudio geocronológico Rb-Sr de los complejos Chon-Aike y El Quemado a los 47°30′L.S (1993) Actas 12th Congreso Geológico Argentino, 4, pp. 171-178
  • Pankhurst, R.J., Leat, P.T., Sruoga, P., Rapela, C.W., Márquez, M., Storey, B.C., Riley, T.R., The Chon-Aike silicic igneous province of Patagonia and related rocks in West Antarctica: A silicic LIP (1998) Journal of Volcanology and Geothermal Research, 81, pp. 113-136
  • Pankhurst, R.J., Riley, T.R., Fanning, C.M., Kelley, S.P., Episodic silicic volcanism in Patagonia and the Antarctic Peninsula: Plume and subduction influences associated with the break-up of Gondwana (1999) Extended Abstracts Fourth International Symposium on Andean Geodynamics, pp. 559-562. , Göttingen
  • Pankhurst, R.J., Riley, T.R., Fanning, C.M., Kelley, S.P., Episodic silicic volcanism in Patagonia and the Antarctic Peninsula: Chronology of magmatism associated with the break-up of Gondwana (2000) Journal of Petrology, 41 (7), pp. 605-625
  • Pearce, J.A., Cann, J.R., Tectonic setting of basic volcanic rocks determined using trace element analyses (1973) Earth and Planetary Science Letters, 19, pp. 290-300
  • Pearce, J.A., Norry, M.J., Petrogenetic implications of Ti, Zr, Y and Nb variations in volcanic rocks (1979) Contributions to Mineralogy and Petrology, 69, pp. 33-47
  • Plank, T., Langmuir, C., An evaluation of the global variations in the major element chemistry of arc basalts (1988) Earth and Planetary Science Letters, 90, pp. 349-370
  • Rapalini, A., López de Luchi, M.G., Paleomagnetism and magnetic fabric of Middle Jurassic dykes from western Patagonia, Argentina (2000) Physics of the Earth and Planetary Interiors, 120, pp. 11-27
  • Rapela, C.W., Pankhurst, R.J., El volcanismo riolítico del noreste de la Patagonia: un evento meso-jurásico de corta duración y origen profundo (1993) Actas 12th Congreso Geológico Argentino, 4, pp. 179-188
  • Ravazzoli, I., Sesana, F.L., Descripción geolo'gica de la Hoja 41 c, Río Chico, provincia de Río Negro (1977), 148, p. 80. , Servicio Geológico Nacional, Buenos Aires; Rickwood, P.C., Boundary lines within petrological diagrams which use oxides of major and minor elements (1989) Lithos, 22, pp. 247-263
  • Storey, B.C., Vaughan, A.P., Geodynamic evolution of the Antarctica Peninsula during Mesozoic times and its bearing on Weddel sea history (1996) Geological Society of London, Special Publication, 108, pp. 87-103. , Millar
  • Sun, S.S., Lead isotopic studies of young volcanic rocks from midoceanic ridges, ocean islands and island arcs (1980) Phylosophical Transactions of the Royal Society, 297 A, pp. 409-445
  • Vilas, J.F., Palaeomagnetism of some igneous rocks of the Middle Jurassic Chon-Aike Formation from Estancia La Reconquista, Province of Santa Cruz, Argentina (1974) Geophysical Journal of the Royal Astronomical Society, 39, pp. 511-522
  • Watson, E.B., Harrison, T.M., Zircon saturation revisited: Temperature and compositional effects in a variety of crustal magma types (1983) Earth and Planetary Science Letters, 64, pp. 295-304
  • Wilson, M., (1989) Igneous Petrogenesis, , Unwyn Hyman, London, 466 p
  • Wood, D.A., The application of a Th-Hf-Ta diagram to problems of tectonomagmatic classification and to establishing the nature of crustal contamination of basltic lavas of the British Tertiary volcanic province (1980) Earth and Planetary Science Letters, 50, pp. 11-30

Citas:

---------- APA ----------
López De Luchi, M.G. & Rapalini, A.E. (2002) . Middle Jurassic dyke swarms in the North Patagonian Massif: The Lonco trapial formation in the Sierra de Mamil Choique, Río Negro province, Argentina. Journal of South American Earth Sciences, 15(6), 625-641.
http://dx.doi.org/10.1016/S0895-9811(02)00083-4
---------- CHICAGO ----------
López De Luchi, M.G., Rapalini, A.E. "Middle Jurassic dyke swarms in the North Patagonian Massif: The Lonco trapial formation in the Sierra de Mamil Choique, Río Negro province, Argentina" . Journal of South American Earth Sciences 15, no. 6 (2002) : 625-641.
http://dx.doi.org/10.1016/S0895-9811(02)00083-4
---------- MLA ----------
López De Luchi, M.G., Rapalini, A.E. "Middle Jurassic dyke swarms in the North Patagonian Massif: The Lonco trapial formation in the Sierra de Mamil Choique, Río Negro province, Argentina" . Journal of South American Earth Sciences, vol. 15, no. 6, 2002, pp. 625-641.
http://dx.doi.org/10.1016/S0895-9811(02)00083-4
---------- VANCOUVER ----------
López De Luchi, M.G., Rapalini, A.E. Middle Jurassic dyke swarms in the North Patagonian Massif: The Lonco trapial formation in the Sierra de Mamil Choique, Río Negro province, Argentina. J. South Am. Earth Sci. 2002;15(6):625-641.
http://dx.doi.org/10.1016/S0895-9811(02)00083-4