Thermobarometry, Sm/Nd Ages and Geophysical Evidence for the Location of the Suture Zone Between Cuyania and the Western Proto-Andean Margin of Gondwana

Porcher, Carla Cristine; Fernandes, Luís Alberto D’Ávila; Vujovich, Graciela I.; Chernicoff, Carlos Jorge

doi:10.1016/s1342-937x(05)71084-4

Cited by 29 publications

(85 citation statements)

References 38 publications

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“…Until now most reliable metamorphic ages in the Maz and Espinal area were either Grenville-age (ca. 1.2 Ga) or Famatinian (430-440 Ma, e.g., Lucassen and Becchio, 2003;Porcher et al, 2004;Casquet et al, 2005Casquet et al, , 2006Casquet et al, , 2008and our unpublished data). Involvement of the Western Sier ras Pampeanas Grenville-age basement in the Pampean orogeny has, however, been recently emphasized by Rapela et al (2007).…”

Section: Chronological Interpretation and Geodynamic Implicationssupporting

confidence: 56%

“…The Sierra de Maz ( Fig. 1 b) is one of the Western Sierras Pampeanas where Grenville age metamorphic and igneous rocks have been recognized (Porcher et al, 2004;Casquet et al, 2005Casquet et al, , 2006Casquet et al, , 2008. Other larger outcrops of Grenville-age rocks exist in the Sierra de Pie de Palo (see review by Ramos, 2004;Baldo et al, 2006) and Umango (Varela et al, 2003) ( Fig.…”

Section: Geological and Paleogeographical Settingmentioning

confidence: 97%

“…Evidence for deformation and metamorphic rejuvenation under amphibolite facies conditions in the Maz and Espinal area at ca. 430-440 Ma has been shown by Lucassen and Becchio (2003), Porcher et al (2004) and Casquet et al (2005Casquet et al ( , 2008.…”

Section: Chronological Interpretation and Geodynamic Implicationsmentioning

confidence: 98%

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A deformed alkaline igneous rock–carbonatite complex from the Western Sierras Pampeanas, Argentina: Evidence for late Neoproterozoic opening of the Clymene Ocean?

Casquet

Pankhurst

Galindo

et al. 2008

Precambrian Research

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A deformed ca. 570 Ma syenite-carbonatite body is reported from a Crenville-age (1.0-1.2 Ca) terrane in the Sierra de Maz, one of the Western Sierras Pampeanas of Argentina. This is the first recognition of such a rock assemblage in the basement of the Central Andes. The two main lithologies are coarse-grained syen ite (often nepheline-bearing) and enclave-rich fine-grained foliated biotite-calcite carbonatite. Samples of carbonatite and syenite yield an imprecise whole rock Rb-Sr isochron age of 582 ± 60 Ma (MSWD = 1.8; Sri = 0.7029); SHRIMP U-Pb spot analysis of syenite zircons shows a total range of2 0 6Pb_238U ages between 433 and 612 Ma, with a prominent peak at 560-580 Ma defined by homogeneous zircon areas. Te xtural interpretation of the zircon data, combined with the constraint of the Rb-Sr data suggest that the car bonatite complex formed at ca. 570 Ma. Further disturbance of the U-Pb system took place at 525 ± 7 Ma (Pampean orogeny) and at ca. 430-440 Ma (Famatinian orogeny) and it is concluded that the Western Sierras Pampeanas basement was joined to Condwana during both events. Highly unradiogenic values in calcites (0.70275-0.70305) provide a close estimate for the initial Sr isotope composition of the carbonatite magma. Sm-Nd data yield BNds7 0 values of +3.3 to +4.8. The complex was probably formed during early opening of the Clymene Ocean from depleted mantle with a component from MesojNeo proterozoic lower continental crust.

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Section: Chronological Interpretation and Geodynamic Implicationssupporting

confidence: 56%

Section: Geological and Paleogeographical Settingmentioning

confidence: 97%

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A deformed alkaline igneous rock–carbonatite complex from the Western Sierras Pampeanas, Argentina: Evidence for late Neoproterozoic opening of the Clymene Ocean?

Casquet

Pankhurst

Galindo

et al. 2008

Precambrian Research

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“…The Central Domain (also known as the Maz terrane) consists of medium-grade (kyanite-sillimanite-garnet-staurolite schists, quartzites, amphibolites and marbles) to high-grade intermediate-to-ultrabasic metaigneous rocks and metasedimentary rocks that underwent a Grenvillian-age orogeny starting at ca. 1.2 Ga (Porcher et al, 2004;Casquet et al, 2006). Massif-type anorthosites of ca.…”

Section: Introductionmentioning

confidence: 99%

A-type magmatism in the sierras of Maz and Espinal: A new record of Rodinia break-up in the Western Sierras Pampeanas of Argentina

Colombo

Baldo

Casquet

et al. 2009

Precambrian Research

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Two orthogneisses have been recognized in the sierras of Espinal and Maz (Western Sierras Pampeanas, NW Argentina) that were emplaced within a Grenvillian metasedimentary sequence. Microcline, plagioclase and quartz are the main rockforming minerals, with accessory zircon, apatite-(CaF), magnetite, biotite (Fe/(Fe+Mg) = 0.88-0.91), ferropargasite (Fe total /( Fe total + Mg) = 0.88-0.89), titanite (with up to 1.61 wt.% Y 2 O 3 ) and an REE-rich epidote. REE-poor epidote and zoned garnet (Ca and Fe 3+

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“…Para el Complejo Maz (en las Sierras de Maz-Espinal) y la sierra de Umango (Fig. 7), se obtuvieron edades comprendidas entre los 421±5 y 466±1 Ma (Lucassen y Becchio, 2003;Porcher et al, 2004;Casquet et al, 2005). Edades similares fueron obtenidas algo más al sur, en las sierras de Valle Fértil y Las Imanas (463±2 Ma, Baldo et al, 2001;465±5 Ma, Galindo et al, 2004).…”

Section: Edades Del Metamorfismo En Un Contexto Regionalunclassified

Edades de metamorfismo en las unidades con bajo grado de la region central del Famatina: la impronta del ciclo orogenico ocloyico (Ordovicico).Metamorphic ages of low-grade units in the central region of Famatina: The signature of the Ocloyic Orogeny (Ordovician).

Collo¹,

Astini²,

Cardona³

et al. 2008

Andgeo

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RESUMEN.Muchos de los episodios de metamorfismo y deformación asociados a las rocas de bajo grado del NO argentino fueron tradicionalmente vinculados con orógenos antiguos como el pampeano (Cámbrico) y el oclóyico (Ordovícico). En el cinturón del Famatina, la falta de dataciones precisas y de un análisis estratigráfico de detalle en las sucesiones con bajo grado, condujeron a interpretaciones ambiguas respecto a la evolución paleozoica del segmento sur de los Andes Centrales. Estudios recientes establecen que el 'basamento metamórfico' de bajo grado de dicha región estaría conformado por las formaciones Negro Peinado y Achavil, cuyos análisis de procedencia las vinculan con la finalización del ciclo pampeano. Por su parte, la Formación La Aguadita, también afectada por metamorfismo de bajo grado, correspondería a depósitos sinorogénicos ordovícicos (oclóyicos). En consecuencia, el conjunto sería más joven que la Formación Puncoviscana (prepampeana) con la que fue habitualmente correlacionado. Las edades K-Ar presentadas en este trabajo permiten establecer que el metamorfismo y la deformación de estas unidades son Ordovícicos y no más antiguos (Proterozoico-Cámbrico Medio) como se interpretó durante muchos años. Edades de 457±9 Ma (roca total) y 463±14 Ma (fracción <2µm) obtenidas para la Formación Negro Peinado, permiten su vinculación con el clímax de la orogenia oclóyica, desarrollada en el margen occidental de Gondwana durante el Paleozoico inferior. Las edades de 435±12 Ma (fracción <2µm) en la Formación La Aguadita y de 444±8 Ma (roca total) en filonitas de la faja de deformación Angulos, son consistentes con la extensión de este ciclo orogénico hasta el Silúrico Inferior. Adicionalmente, se obtuvo una edad de 359±7 Ma (fracción <2µm) en rocas de la Formación Negro Peinado (faja de deformación Las Trancas), que evidencia un reequilibrio local del sistema isotópico K-Ar parcialmente coincidente con el rango temporal asignado para la orogenia achaliana (Silúrico Tardío-Carbonífero temprano).

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Thermobarometry, Sm/Nd Ages and Geophysical Evidence for the Location of the Suture Zone Between Cuyania and the Western Proto-Andean Margin of Gondwana

Cited by 29 publications

References 38 publications

A deformed alkaline igneous rock–carbonatite complex from the Western Sierras Pampeanas, Argentina: Evidence for late Neoproterozoic opening of the Clymene Ocean?

A deformed alkaline igneous rock–carbonatite complex from the Western Sierras Pampeanas, Argentina: Evidence for late Neoproterozoic opening of the Clymene Ocean?

A-type magmatism in the sierras of Maz and Espinal: A new record of Rodinia break-up in the Western Sierras Pampeanas of Argentina

Edades de metamorfismo en las unidades con bajo grado de la region central del Famatina: la impronta del ciclo orogenico ocloyico (Ordovicico).Metamorphic ages of low-grade units in the central region of Famatina: The signature of the Ocloyic Orogeny (Ordovician).

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