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Abstract:

The metamorphic P-T conditions of low-grade units from the Famatina belt, Central Andes of Argentina, were estimated through petrography, X-ray diffraction, and electron microscopy. For the Middle-Upper Cambrian Negro Peinado Formation a tectono-metamorphic event associated with intense intrafoliar folding, with estimated temperatures between 290 and 400°C (KICIS: 0.16-0.27Δ°2θ, biotite blastesis and compositional homogeneity in dioctahedral micas) and intermediate pressure conditions (white mica b parameter: 9.010Å-9.035Å), was recognized. The Achavil Formation (Middle-Upper Cambrian) presents a main metamorphic event associated with temperatures between 200 and 290°C (KICIS: 0.26-0.41Δ°2θ) and intermediate- to low-pressure conditions (white mica b parameter values: 8.972Å-9.017Å). Some illitic infstitution in dioctahedral micas also indicates lower metamorphic grade than the Negro Peinado Formation. For Upper Cambrian to Middle Ordovician sequences a burial metamorphic pattern, with a progressive decrease in metamorphic grade from Volcancito Formation to Cerro Morado Group (ca. 490-465 Ma; KICIS: 0.31-0.69Δ°2θ) and absence of tendency changes linked to stratigraphic discontinuities was proposed. Mica and chlorite are the main phyllosilicates in the oldest units, while Ilt/Sme (R3) mixed-layer is almost the only one in the youngest. White mica b parameter indicates intermediate- to low-pressure conditions for all these sequences. This burial metamorphic pattern presents a marked break as the youngest Ordovician unit (La Aguadita Formation, after ca. 452 Ma) records higher metamorphic conditions (IKCIS: 0.28-0.19Δ°2θ) than units from the Ordovician arc, with estimated temperatures between 270 and 330°C and intermediate-pressure conditions. Our results indicate that basin contraction and inversion processes related to the Ordovician Ocloyic Orogeny involved at least two well-discriminated and not superposed metamorphic episodes in this region.

Registro:

Documento: Artículo
Título:Low-grade metamorphism of cambro-ordovician successions in the famatina belt, southern-central andes: Burial-inversion history linked to the evolution of the proto-andean gondwana margin
Autor:Collo, G.; do Campo, M.; Nieto, F.
Filiación:Laboratorio de Análisis de Cuencas, CICTERRA-Universidad Nacional de Córdoba, Av. Vélez Sarsfield 1611, 2 piso, of. 7, X5016GCA Córdoba, Argentina
Instituto de Geocronología y Geología Isotópica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón INGEIS, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Departamento de Mineralogía y Petrología, Instituto Andaluz de Ciencias de la Tierra, Universidad de Granada-CSIC, Avda, Fuentenueva s/n, 18002 Granada, Spain
Palabras clave:Famatina belt; Low-grade metamorphism; Ocloyic orogeny; Western gondwana margin; Cambrian; electron microscopy; Gondwana; low grade metamorphism; Ordovician; orogeny; P-T conditions; parameterization; petrography; phyllosilicate; pressure effect; tectonic evolution; tectonic setting; X-ray diffraction; Argentina; La Rioja [Argentina]; Sierra de Famatina; Sierras Pampeanas; Micas
Año:2011
Volumen:38
Número:2
Página de inicio:284
Página de fin:318
Título revista:Andean Geology
Título revista abreviado:Andean Geol.
ISSN:07187092
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v38_n2_p284_Collo

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Citas:

---------- APA ----------
Collo, G., do Campo, M. & Nieto, F. (2011) . Low-grade metamorphism of cambro-ordovician successions in the famatina belt, southern-central andes: Burial-inversion history linked to the evolution of the proto-andean gondwana margin . Andean Geology, 38(2), 284-318.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v38_n2_p284_Collo [ ]
---------- CHICAGO ----------
Collo, G., do Campo, M., Nieto, F. "Low-grade metamorphism of cambro-ordovician successions in the famatina belt, southern-central andes: Burial-inversion history linked to the evolution of the proto-andean gondwana margin " . Andean Geology 38, no. 2 (2011) : 284-318.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v38_n2_p284_Collo [ ]
---------- MLA ----------
Collo, G., do Campo, M., Nieto, F. "Low-grade metamorphism of cambro-ordovician successions in the famatina belt, southern-central andes: Burial-inversion history linked to the evolution of the proto-andean gondwana margin " . Andean Geology, vol. 38, no. 2, 2011, pp. 284-318.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v38_n2_p284_Collo [ ]
---------- VANCOUVER ----------
Collo, G., do Campo, M., Nieto, F. Low-grade metamorphism of cambro-ordovician successions in the famatina belt, southern-central andes: Burial-inversion history linked to the evolution of the proto-andean gondwana margin . Andean Geol. 2011;38(2):284-318.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v38_n2_p284_Collo [ ]