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Abstract:

The Late Triassic Central Patagonian Batholith is a key element in paleogeographic models of West Gondwana just before to the break-up of the supercontinent. The preexisting classification of units of this batholith was mainly based on isotopic and geochemical data. Here we report the results of field mapping and petrography, backed up by three new 40Ar/39Ar biotite ages, which reveal previously unnoticed relationships of the rocks in the batholith. Based on the new information we present a reorganization of units where the batholith is primarily formed by the Gastre and the Lipetrén superunits. The Gastre Superunit is the oldest magmatic suite and is composed of I-type granites which display evidence of felsic and mafic magma interaction. It is formed by 4 second-order units: 1) equigranular hornblende-biotite granodiorites, 2) porphyritic biotite-hornblende monzogranites, 3) equigranular biotitic monzogranites and 4) hornblende quartz-diorites. Emplacement depth of the Gastre Superunit is bracketed between 6 and 11km (1.8-3kbar), and the maximum recorded temperatures of emplacement are comprised between 660 and 800°C. The recalculated Rb/Sr age is 222±3Ma and the porphyritic biotite-hornblende monzogranites yielded a 40Ar/39Ar age in biotite of 213±5Ma. On the other hand, the Lipetrén Superunit is made up by fine-grained biotitic monzo- and syenogranites that postdate magma hybridization processes and intrude all the other units. The recalculated Rb/Sr age for this suite is identical to a 40Ar/39Ar age in biotite extracted from one of its monzogranites (206.4±5.3 and 206±4Ma, respectively). This and the observed textural features suggest very fast cooling related to a subvolcanic emplacement. An independent unit, the "Horqueta Granodiorite", which has previously been considered as the record of a Jurassic intrusive stage in the Central Patagonian Batholith, gave a 40Ar/39Ar age in biotite of 214±2Ma. This and the reexamination of available isotopic data allow propose that this granodiorite unit is part of the Late Paleozoic intrusives in the region. The Late Triassic Central Patagonian Batholith is overlain by 190-185Ma volcano-sedimentary rocks, suggesting that it was exposed sometime between the latest Triassic and earliest Jurassic times, roughly coeval with a major accretionary episode in the southwestern margin of Gondwana. © 2014 Elsevier Ltd.

Registro:

Documento: Artículo
Título:The Late Triassic Central Patagonian Batholith: Magma hybridization, 40Ar/39Ar ages and thermobarometry
Autor:Zaffarana, C.B.; Somoza, R.; López de Luchi, M.
Filiación:Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (I.G.E.B.A.), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Intendente Güiraldes 2160, Ciudad Universitaria, C1428EGA Buenos Aires, Argentina
INGEIS-CONICET Instituto de Geocronología y Geología Isotópica, Pabellón INGEIS, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
Palabras clave:Cooling ages; Gastre; Hybridization; North Patagonian Massif; Thermobarometry; accretionary prism; argon-argon dating; barometry; batholith; biotite; continental breakup; emplacement; Gondwana; hornblende; hybridization; I-type rock; Jurassic; magma; paleogeography; Paleozoic; petrography; Triassic; Patagonia
Año:2014
Volumen:55
Página de inicio:94
Página de fin:122
DOI: http://dx.doi.org/10.1016/j.jsames.2014.06.006
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_v55_n_p94_Zaffarana

Referencias:

  • Abdel Rahman, A.M., Nature of biotites from alkaline, calc-alkaline and peraluminous magmas (1994) J.Petrol., 35, pp. 525-541
  • Anderson, J.L., Status of thermobarometry in granitic batholiths (1996) Trans. R. Soc. Edinb. Earth Sci., 87, pp. 125-138
  • Anderson, J.L., Smith, D.R., The effects of temperature and fO2 on the Al-in-hornblende barometer (1995) Am. Mineral., 80, pp. 549-559
  • Armstrong, J.T., Quantitative analysis of silicates and oxide minerals: comparison of Monte-Carlo, ZAF and Phi-Rho-Z procedures (1988) Proceedings of the Microbeam Analysis Society, p. 239. , San Francisco Press, San Francisco, D.E. Newbury (Ed.)
  • Arzi, A.A., Critical phenomena in the rheology of partially melted rocks (1978) Tectonophysics, 44, pp. 173-184
  • Barbarin, B., Mafic magmatic enclaves and mafic rocks associated with some granitoids of the central Sierra Nevada batholith, California: nature, origin, and relations with the hosts (2005) Lithos, 80, pp. 155-177
  • Barbarin, B., Didier, J., Genesis and evolution of mafic microgranular enclaves through various types of interaction between coexisting felsic and mafic magmas (1992) Trans. R. Soc. Edinb. Earth Sci., 83, pp. 145-153
  • Bateman, R., The interplay between crystallization, replenishment and hybridization in large felsic magma chambers (1995) Earth Sci. Rev., 39, pp. 91-106
  • Bergantz, G.W., On the dynamics of magma mixing by reintrusion: implications for pluton assembly processes (2000) J.Struct. Geol., 22 (9), pp. 1297-1309
  • Bilmes, A., D'Elia, L., Franzese, J.R., Veiga, G.D., Hernández, M., Miocene block uplift and basin formation in the Patagonian foreland: the Gastre Basin, Argentina (2013) Tectonophysics, 601, pp. 98-111
  • Blundy, J.D., Holland, T.J.B., Calcic amphibole equilibria and a new amphibole-plagioclase geothermometer (1990) Contrib. Mineral. Petrol., 104, pp. 208-224
  • Bradshaw, J.D., Andrews, P.B., Adams, C.J., Carboniferous to Cretaceous on the Pacific margin of Gondwana: the Rangitata phase of New Zealand (1981) Gondwana Five: Papers and Abstracts of Papers Presented at the Fifth International Gondwana Symposium, pp. 217-221. , Balkema, Rotterdam, M.M. Cresswell, P. Vella (Eds.)
  • Brown, M., Granite: from genesis to emplacement (2013) Geol. Soc. Am. Bull., 125 (7-8), pp. 1079-1113
  • Candela, P.A., Areview of shallow, ore-related granites: textures, volatiles, and ore metals (1997) J.Petrol., 38 (12), pp. 1619-1633
  • Castro, A., The off-crust origin of granite batholiths (2014) Geosci. Front., 5 (1), pp. 63-75
  • Castro, A., Moreno-Ventas, I., De la Rosa, J.D., Multistage crystallization of tonalitic enclaves in granitoid rocks (Hercynian belt, Spain): implications for magma mixing (1991) Geol. Rundsch., 80, pp. 109-120
  • Cerredo, M.E., López de Luchi, M.G., Mamil Choique Granitoids, southwestern North Patagonian Massif, Argentina: magmatism and metamorphism associated with a polyphasic evolution (1998) J.South Am. Earth Sci., 11, pp. 499-515
  • Chappell, B.W., White, A.J.R., Two contrasting granite types: 25 years later (2001) Aust. J. Earth Sci., 48, pp. 489-499
  • Cuneo, R., Ramezani, J., Scasso, R., Pol, D., Escapa, I., Zavattieri, A.M., Bowring, S.A., High-precision U-Pb geochronology and a new chronostratigraphy for the Cañadón Asfalto Basin, Chubut, central Patagonia: implications for terrestrial faunal and floral evolution in Jurassic (2013) Gondwana Res., 24, pp. 1267-1275
  • Dalla Salda, L., Varela, R., Cingolani, C., Aragón, E., The Río Chico Paleozoic crystalline complex and the evolution of Northern Patagonia (1994) J.South Am. Earth Sci., 7, pp. 377-386
  • Debon, F., Comparative major element chemistry in various "microgranular enclave-plutonic host" pairs (1991) Enclaves and Granite Petrology, pp. 293-312. , Elsevier, Amsterdam, J. Didier, B. Barbarin (Eds.)
  • Dorais, M., Whitney, J.A., Roden, M.F., Origin of mafic enclaves in the Dinkey Creek pluton, central Sierra Nevada batholith, California (1990) J.Petrol., 31, pp. 853-881
  • Figari, E.F., Courtade, S.F., Constantini, L.A., Estratigrafía y tectónica de los bajos de Gastre y Gan Gan (1994) Bol. Inf. Pet., 40, pp. 75-82
  • Fernández, A., Barbarin, B., Relative rheology of coeval mafic and felsic magmas: nature of resulting interaction processes and shape and mineral fabrics of mafic mineral enclaves (1991) Enclaves and Granite Petrology, pp. 263-276. , Elsevier, Amsterdam, J. Didier, B. Barbarin (Eds.)
  • Fernandez, A., Gasquet, D., Relative rheological evolution of chemically contrasted coeval magmas: example of the Tichka plutonic complex (Morocco) (1994) Contrib. Mineral. Petrol., 116, pp. 316-326
  • Franzese, J., Martino, R., Aspectos cinemáticos y tectónicos de la zona de cizalla de Gastre en la Sierra de Calcatapul, Provincia de Chubut; Argentina (1998) XCongreso Latinoamericano de Geología y VI Congreso Nacional de Geología Económica, Buenos Aires, Actas, 2, p. 3
  • González, P., Coluccia, A., Franchi, M., (2003) Hoja 4169-III Ingeniero Jacobacci. Carta Geológica de la República Argentina, , Servicio Geológico Minero Argentino, Buenos Aires, Scale: 1:250.000
  • Grove, M., Harrison, T.M., 40Ar* diffusion in Fe-rich biotite (1996) Am. Mineral., 81, pp. 940-951
  • Hammarstrom, J.M., Zen, E.-A., Aluminium in hornblende: an empirical igneous geobarometer (1986) Am. Mineral., 71, pp. 1297-1313
  • Hervé, F., Fanning, C.M., Pankhurst, R.J., Detrital zircon age patterns and provenance of the metamorphic complexes of southern Chile (2003) J.South Am. Earth Sci., 16, pp. 107-123
  • Hervé, F., Calderón, M., Faúndez, V., The metamorphic complexes of the Patagonian and Fuegian Andes (2008) Geol. Acta, 6, pp. 43-53
  • Hibbard, M.J., Textural anatomy of twelve magma-mixed granitoid systems (1991) Enclaves and Granite Petrology, pp. 431-444. , Elsevier, Amsterdam, J. Didier, B. Barbarin (Eds.)
  • Holland, T., Blundy, J., Non-ideal interactions in calcic amphiboles and their bearing on amphibole-plagioclase thermometry (1994) Contrib. Mineral. Petrol., 116, pp. 433-447
  • Hollister, L.S., Grissom, G.C., Peters, E.K., Stowell, H.H., Sisson, V.B., Confirmation of the empirical correlation of A1 in hornblende with pressure of solidification of calc-alkaline plutons (1987) Am. Mineral., 72, pp. 231-239
  • Hrouda, F., Táborská, S., Schulmann, K., Jezek, J., Dolejs, D., Magnetic fabric and rheology of co-mingled magmas in the Nasavrky Plutonic Complex (E Bohemia): implications for intrusive strain regime and emplacement mechanism (1999) Tectonophysics, 307, pp. 93-111
  • Janoušek, V., Bowes, D.R., Braithwaite, C.J.R., Rogers, G., Microstructural and mineralogical evidence for limited involvement of magma mixing in the petrogenesis of a Hercynian high-K calc-alkaline intrusion: the Kozárovice granodiorite, Central Bohemian Pluton, Czech Republic (2001) Trans. R. Soc. Edinb. Earth Sci., 91, pp. 15-26
  • Johnson, M.C., Rutherford, M.J., Experimentally determined conditions in the Fish Canyon Tuff, Colorado, magma chamber (1989) J.Petrol., 30, pp. 711-737
  • Kretz, R., Symbols for rock-forming minerals (1983) Am. Mineral., 68, pp. 277-279
  • Leake, B.E., Woolley, A.R., Arps, C.E.S., Birch, W.D., Gilbert, M.C., Grice, J.D., Hawthorne, F.C., Youzhi, G., Nomenclature of amphiboles: report of the subcommittee on amphiboles of the International Mineralogical Association Commission on new minerals and mineral names (1997) Mineral. Mag., 61, pp. 295-321
  • Lister, J.R., Kerr, R.C., Fluid-mechanical models of crack propagation and their application to magma transport in dykes (1991) J.Geophys. Res., 96 (B6), pp. 10049-10077
  • López de Luchi, M.G., Cerredo, M.E., Geochemistry of the Mamil Choique granitoids at Rio Chico, Río Negro, Argentina: late Paleozoic crustal melting in the North Patagonian Massif (2008) J.South Am. Earth Sci., 25, pp. 526-546
  • Ludwig, K.R., (1991) ISOPLOT: a Plotting and Regression Program for Radiogenic-isotope Data, Version 2.53, , USGS Open-File Report: 91-445
  • MacDonald, D., Gomez-Perez, I., Franzese, J., Spalletti, L., Lawver, L., Gahagan, L., Dalziel, I., Paton, D., Mesozoic break-up of SW Gondwana: implications for regional hydrocarbon potential of the southern South Atlantic (2003) Mar. Petrol. Geol., 20, pp. 287-308
  • Marsh, B.D., On the interpretation of crystal size distributions in magmatic systems (1998) J.Petrol., 39, pp. 553-599
  • Marshall, J.E.A., The Falkland Islands: a key in Gondwana paleogeography (1994) Tectonics, 13, pp. 499-514
  • Martin, A.K., Gondwana breakup via double-saloon-door rifting and seafloor spreading in a backarc basin during subduction rollback (2007) Tectonophysics, 445, pp. 245-272
  • Miller, H., The position of Antarctica within Gondwana in the light of Palaeozoic orogenic development (1983) Antarctic Earth Science, pp. 579-581. , Cambridge University Press, R.L. Oliver, P.R. James, J.B. Jago (Eds.)
  • Nullo, F.E., Descripción Geológica de la Hoja 41d, Lipetrén, Provincia de Río Negro (1978) Secr. Est. Miner. Minist. Econ. Repúb. Argent. Bol., 158, pp. 1-88. , Scale: 1:200000
  • Page, R., Page, S., Petrología y sugnificado tectónico del Jurásico volcánico del Chubut central (1993) Rev. Asoc. Geol. Argent., 48, pp. 41-58
  • Paterson, S.R., Fowler, T.K., Schmidt, K.L., Yoshinobu, A.S., Yuan, E.S., Miller, R.B., Interpreting magmatic fabric patterns in plutons (1998) Lithos, 44 (1-2), pp. 53-82
  • Petford, N., Rheology of granitic magmas during ascent and emplacement (2003) Annu. Rev. Earth Planet. Sci., 31, pp. 399-427
  • Pinotti, L.P., Demartis, M., Coniglio, J.E., Estructuras magmáticas en granitos (2010) Rev. Asoc. Geol. Argent., 67 (4), pp. 562-572
  • Pitcher, W.S., Synplutonic dykes and mafic enclaves (1991) Enclaves and Granite Petrology, pp. 383-391. , Elsevier, Amsterdam, J. Didier, B. Barbarin (Eds.)
  • Piwinskii, A.J., Experimental studies of igneous rock series central Sierra Nevada batholith, California (1968) J.Geol., 76 (5), pp. 548-570
  • Proserpio, C.A., Descripción Geológica de la Hoja 42d, Gastre, Provincia del Chubut (1978) Secr. Est. Miner. Minist. Econ. Bol., 159, pp. 1-75. , Scale: 1:200000
  • Rapela, C.W., Dias, G.F., Franzese, J.R., Alonso, G., Benvenuto, A.R., El Batolito de la Patagonia central: evidencias de un magmatismo triásico-jurásico asociado a fallas transcurrentes (1991) Rev. Geol. Chile, 18, pp. 121-138
  • Rapela, C.W., Pankhurst, R.J., The granites of northern Patagonia and the Gastre Fault System in relation to the break-up of Gondwana (1992) Geol. Soc. London Spec. Publ., 68, pp. 209-220. , Magmatism and the Causes of Continental Break-up
  • Rapela, C.W., Pankhurst, R.J., Harrison, S.M., Triassic "Gondwana" granites of the Gastre district, North Patagonian Massif (1992) Trans. R. Soc. Edinb. Earth Sci., 83, pp. 291-304
  • Rapela, C.W., Pankhurst, R.J., Fanning, C.M., Herve, F., Pacific subduction coeval with the Karoo mantle plume: the Early Jurassic Subcordilleran belt of northwestern Patagonia (2005) Geol. Soc. London Spec. Publ., 246 (1), pp. 217-239
  • Renne, P.R., Swisher, C.C., Deino, A.L., Karner, D.B., Owens, T.L., De Paolo, D.J., Intercalibration of standards, absolute ages and uncertainties in 40Ar/39Ar dating (1998) Chem. Geol., 145, pp. 117-152
  • Scaillet, B., Holtz, F., Whittington, A., Pichavant, M., Phase equilibrium constraints on the viscosity of silicic magmas: 1. Volcanic-plutonic comparison (1998) J.Geophys. Res., 103, pp. 27257-27266
  • Schmidt, M.W., Amphibole composition in tonalite as a function of pressure: an experimental calibration of the Al-in-hornblende barometer (1992) Contrib. Mineral. Petrol., 110, pp. 304-310
  • Somoza, R., Zaffarana, C.B., Mid-Cretaceous polar standstill of South America, motion of the Atlantic hotspots and the birth of the Andean cordillera (2008) Earth Planet. Sci. Lett., 271, pp. 267-277
  • Steiger, R.H., Jäger, E., Subcommission on geochronology: convention on the use of decay constants in geo- and cosmo-chronology (1977) Earth Planet. Sci. Lett., 36, pp. 359-362
  • Storey, B.C., Curtis, M.L., Ferris, J.K., Hunter, M.A., Livermore, R.A., Reconstruction and break-out model for the Falkland Islands within Gondwana (1999) J.Afr. Earth Sci., 29, pp. 153-163
  • Streckeisen, A., To each plutonic rock its proper name (1976) Earth Sci. Rev., 12, pp. 1-33
  • Sumita, I., Ota, Y., Experiments on buoyancy driven crack around the brittle-ductile transition (2011) Earth Planet. Sci. Lett., 304, pp. 337-346
  • Thomson, S.N., Hervé, F., New time constraints for the age of metamorphism at the ancestral Pacific Gondwana margin of southern Chile (42-52°S) (2002) Rev. Geol. Chile, 29, pp. 151-165
  • Tobisch, O., McNulty, B., Vernon, R., Microgranitoid enclave swarms in granitic plutons, central Sierra Nevada, California (1997) Lithos, 40 (2-4), pp. 321-339
  • Van der Molen, I., Paterson, M.S., Experimental deformation of partially melted granite (1979) Contrib. Mineral. Petrol., 36, pp. 161-199
  • Varela, R., Basei, M.A.S., Cingolani, C.A., Oswaldo Siga, J., Passarelli, C.R., El basamento cristalino de los Andes norpatagónicos en Argentina: geocronología e interpretación tectónica (2005) Rev. Geol. Chile, 32, pp. 167-187
  • Vaughan, A.P.M., Livermore, R.A., Episodicity of Mesozoic terrane accretion along the Pacific margin of Gondwana: implications for superplume-plate interactions (2005) Geol. Soc. London Spec. Publ., 246, pp. 143-178. , Terrane Processes and the Margins of Gondwana
  • Vernon, R.H., Crystallization and hybridism in microgranitoid enclave magmas: microstructural evidence (1990) J.Geophys. Res., 95, pp. 17849-17859
  • Vernon, R.H., Interpretation of microstructures of microgranitoid enclaves (1991) Enclaves and Granite Petrology, Developments in Petrology, pp. 277-291. , Elsevier, Amsterdam, J. Didier, B. Barbarin (Eds.)
  • Vigneresse, J.L., Barbey, P., Cuney, M., Rheological transitions during partial melting and crystallization with application to felsic magma segregation and transfer (1996) J.Petrol., 37 (6), pp. 1579-1600
  • Volkheimer, W., Estratigrafía de la región extra-andina del Departamento de Cushamen (Chubut), entre los paralelos 42° y 42° 30' y los meridianos 70° y 71° (1964) Rev. Asoc. Geol. Argent., 20 (2), pp. 85-107
  • Volkheimer, W., Lage, J., Descripción Geológica de la Hoja 42c, Cerro Mirador, Provincia de Chubut (1981) Secr. Est. Miner. Minist. Econ. Bol., 181, pp. 1-71. , Scale: 1:200000
  • von Gosen, W., Loske, W., Tectonic history of Calcatapul Formation, Chubut province, Argentina, and the "Gastre fault system" (2004) J.South Am. Earth Sci., 18, pp. 73-88
  • Watson, E.B., Harrison, T.M., Zircon saturation revisited: temperature and composition effects in a variety of crustal magma types (1983) Earth Planet. Sci. Lett., 64, pp. 295-304
  • Wyllie, P.J., Cox, K.G., Biggar, G.M., The habit of apatite in synthetic systems and igneous rocks (1962) J.Petrol., 3 (2), pp. 238-243
  • Zaffarana, C.B., (2011) Estudio de la deformación pre-cretácica en la región de Gastre, sector sur del Macizo Norpatagónico, , (Ph.D. thesis), Buenos Aires University
  • Zaffarana, C.B., Somoza, R., Palaeomagnetism and 40Ar/39Ar dating from Lower Jurassic rocks in Gastre, central Patagonia: further data to explore tectonomagmatic events associated with the break-up of Gondwana (2012) J.Geol. Soc. London, 169, pp. 371-379
  • Zaffarana, C.B., López de Luchi, M.G., Somoza, R., Mercader, R., Giacosa, R., Martino, R.D., Anisotropy of magnetic susceptibility study in two classical localities of the Gastre Fault System, central Patagonia (2010) J.South Am. Earth Sci., 30, pp. 151-166
  • 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 (2012) Rev. Asoc. Geol. Argent., 69, pp. 106-126

Citas:

---------- APA ----------
Zaffarana, C.B., Somoza, R. & López de Luchi, M. (2014) . The Late Triassic Central Patagonian Batholith: Magma hybridization, 40Ar/39Ar ages and thermobarometry. Journal of South American Earth Sciences, 55, 94-122.
http://dx.doi.org/10.1016/j.jsames.2014.06.006
---------- CHICAGO ----------
Zaffarana, C.B., Somoza, R., López de Luchi, M. "The Late Triassic Central Patagonian Batholith: Magma hybridization, 40Ar/39Ar ages and thermobarometry" . Journal of South American Earth Sciences 55 (2014) : 94-122.
http://dx.doi.org/10.1016/j.jsames.2014.06.006
---------- MLA ----------
Zaffarana, C.B., Somoza, R., López de Luchi, M. "The Late Triassic Central Patagonian Batholith: Magma hybridization, 40Ar/39Ar ages and thermobarometry" . Journal of South American Earth Sciences, vol. 55, 2014, pp. 94-122.
http://dx.doi.org/10.1016/j.jsames.2014.06.006
---------- VANCOUVER ----------
Zaffarana, C.B., Somoza, R., López de Luchi, M. The Late Triassic Central Patagonian Batholith: Magma hybridization, 40Ar/39Ar ages and thermobarometry. J. South Am. Earth Sci. 2014;55:94-122.
http://dx.doi.org/10.1016/j.jsames.2014.06.006