Artículo

Otamendi, J.E.; Vujovich, G.I.; de la Rosa, J.D.; Tibaldi, A.M.; Castro, A.; Martino, R.D.; Pinotti, L.P. "Geology and petrology of a deep crustal zone from the Famatinian paleo-arc, Sierras de Valle Fértil and La Huerta, San Juan, Argentina" (2009) Journal of South American Earth Sciences. 27(4):258-279
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Abstract:

The ranges of the Sierras Valle Fértil-La Huerta expose natural cross sections through a paleo-arc crust that formed in the Late Cambrian - Early Ordovician Famatinian magmatic arc, northwestern Argentina. Thick mafic sequences of amphibole gabbronorites to orthopyroxene-amphibole-biotite diorites form the lower levels of the exposed paleo-arc section. This mafic unit includes lens-shaped bodies of olivine-bearing cumulate rocks and tabular-shaped sill/dike intrusions of fine-grained chilled amphibole gabbro. The mafic magmas were emplaced into regional metasedimentary sequences at lower crustal levels, corresponding to pressure from 5 to 7 kbar. Gabbronorites likely representing the parental magmas that fluxed into the exposed paleo-arc crust differ from primitive magmatic arc rocks in having somewhat lower Mg-number (ca. 0.60) and compatible (Cr and Ni) trace element contents, and slightly higher Al2O3 contents. This difference is taken to indicate that a pyroxene-rich olivine-bearing assemblage with a bulk high Mg/Fe ratio and low Al2O3 content crystallized from mantle-derived melts before mafic magmas reached the crustal levels currently exhumed. However, some gabbronorites have incompatible trace element signatures typical of primitive mafic arc magmatism. Igneous rocks to some extent more evolved than those of the mafic unit make up a tonalite-dominated intermediate unit. The intermediate unit consists of a heterogeneous suite that ranges from orthopyroxene-bearing amphibole-rich diorites to biotite-rich amphibole-poor tonalites. Within the intermediate unit, chilled mafic rocks are found as a network of dikes, whereas metasedimentary migmatites appear interlayered as m-wide septa and km-long strips. The tonalite-dominated intermediate unit passes into a granodiorite batholith through a transitional zone that is up to 2-km wide. The boundary zone separating the tonalite-dominated and granodiorite-dominated units is characterized by mingling of tonalitic and leucogranitic magmas, which together appear multiply-intruded by mafic sill/dike bodies. Within the tonalite- and granodiorite-dominated units, the less evolved mafic rocks occur as: (1) bodies tens of meters long, (2) chilled dikes and sills, and (3) microgranular inclusions (enclaves), supporting the inference that mafic magmatism was the main source for generating a vast volume of intermediate and silicic igneous rocks. Mass balance calculations and trace element systematics are combined to demonstrate that tonalites and granodiorites formed by concurrent closed-system fractional crystallization and open-system incorporation of paragneissic migmatites and/or anatectic leucogranites into the evolving igneous sequence. This study argues that the sequence of igneous rocks from Valle Fértil-La Huerta was formed as the result of complementary petrogenetic processes that operated concurrently at different levels of the Famatinian arc crust. © 2008 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Geology and petrology of a deep crustal zone from the Famatinian paleo-arc, Sierras de Valle Fértil and La Huerta, San Juan, Argentina
Autor:Otamendi, J.E.; Vujovich, G.I.; de la Rosa, J.D.; Tibaldi, A.M.; Castro, A.; Martino, R.D.; Pinotti, L.P.
Filiación:Departamento de Geología, Universidad Nacional de Río Cuarto, X5804BYA Rio Cuarto, Cordoba, Argentina
Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, 1428 Buenos Aires, Argentina
Departamento de Geología, Universidad de Huelva, E21071 Huelva, Spain
Departamento de Geología, Universidad de Nacional de Córdoba, Facultad de Ciencias Exactas y Naturales, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina
Palabras clave:Diorite; Famatinian; Gabbro; Granodiorite; Magmatic arc; Tonalite; amphibole; Cambrian; crustal structure; emplacement; fractional crystallization; gabbro; mafic rock; magmatism; mantle source; Ordovician; parent body; petrogenesis; petrology; structural geology; trace element; Argentina; La Rioja [Argentina]; San Juan [Argentina]; Sierra de Famatina; Sierra de la Huerta; Sierra de Valle Fertil; Sierras Pampeanas; South America
Año:2009
Volumen:27
Número:4
Página de inicio:258
Página de fin:279
DOI: http://dx.doi.org/10.1016/j.jsames.2008.11.007
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_v27_n4_p258_Otamendi

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Citas:

---------- APA ----------
Otamendi, J.E., Vujovich, G.I., de la Rosa, J.D., Tibaldi, A.M., Castro, A., Martino, R.D. & Pinotti, L.P. (2009) . Geology and petrology of a deep crustal zone from the Famatinian paleo-arc, Sierras de Valle Fértil and La Huerta, San Juan, Argentina. Journal of South American Earth Sciences, 27(4), 258-279.
http://dx.doi.org/10.1016/j.jsames.2008.11.007
---------- CHICAGO ----------
Otamendi, J.E., Vujovich, G.I., de la Rosa, J.D., Tibaldi, A.M., Castro, A., Martino, R.D., et al. "Geology and petrology of a deep crustal zone from the Famatinian paleo-arc, Sierras de Valle Fértil and La Huerta, San Juan, Argentina" . Journal of South American Earth Sciences 27, no. 4 (2009) : 258-279.
http://dx.doi.org/10.1016/j.jsames.2008.11.007
---------- MLA ----------
Otamendi, J.E., Vujovich, G.I., de la Rosa, J.D., Tibaldi, A.M., Castro, A., Martino, R.D., et al. "Geology and petrology of a deep crustal zone from the Famatinian paleo-arc, Sierras de Valle Fértil and La Huerta, San Juan, Argentina" . Journal of South American Earth Sciences, vol. 27, no. 4, 2009, pp. 258-279.
http://dx.doi.org/10.1016/j.jsames.2008.11.007
---------- VANCOUVER ----------
Otamendi, J.E., Vujovich, G.I., de la Rosa, J.D., Tibaldi, A.M., Castro, A., Martino, R.D., et al. Geology and petrology of a deep crustal zone from the Famatinian paleo-arc, Sierras de Valle Fértil and La Huerta, San Juan, Argentina. J. South Am. Earth Sci. 2009;27(4):258-279.
http://dx.doi.org/10.1016/j.jsames.2008.11.007