Artículo

990 Ma peak granulitic metamorphism and amalgamation of Oaxaquia, Mexico: U–Pb zircon geochronological and common Pb isotopic data

Solari, Luigi A.; Keppie, J. Duncan; Ortega-gutiérrez, Fernando; Cameron, Kenneth L.; Lopez, Robert

Instituto de Geología, UNAM, publicado en Revista Mexicana de Ciencias Geológicas y cosechado de y cosechado de Revistas UNAM

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Procedencia del contenido

Cita

Solari, Luigi A., et al. (2004). 990 Ma peak granulitic metamorphism and amalgamation of Oaxaquia, Mexico: U–Pb zircon geochronological and common Pb isotopic data. Revista Mexicana de Ciencias Geológicas; Vol 21 No 2, 2004; 212-225. Recuperado de https://repositorio.unam.mx/contenidos/4122840

Descripción del recurso

Autor(es)
Solari, Luigi A.; Keppie, J. Duncan; Ortega-gutiérrez, Fernando; Cameron, Kenneth L.; Lopez, Robert
Tipo
Artículo de Investigación
Área del conocimiento
Físico Matemáticas y Ciencias de la Tierra
Título
990 Ma peak granulitic metamorphism and amalgamation of Oaxaquia, Mexico: U–Pb zircon geochronological and common Pb isotopic data
Fecha
2018-05-14
Resumen
The ~1 Ga Oaxacan Complex is the largest exposure of the Oaxaquia terrane of Mexico. Microprobe analysis of co-existing ortho- and clino-pyroxene, garnet, ilmenite and plagioclase indicate metamorphic conditions of 735 ± 5° C and 7.7 ± 0.1 kbar in the granulite facies, which was dated between ~998 and ~979 Ma using U–Pb isotopic analyses of zircon populations. Peak temperatures >800° C and isobaric cooling are indicated by the sporadic presence of sapphirine in metasediment and garnet–cordierite– sillimanite–K-feldspar–rutile assemblages, and garnet coronas around pyroxene and titanomagnetite. Common Pb isotopes from acid-leached whole-rock samples define an errorchron that intersects the Stacey/Kramers crustal growth curve at 1,187 ± 63 Ma indicating a major crust-forming event at this time, and suggesting that the granulite facies metamorphism did not significantly reset the common Pb isotopic composition. These data are comparable with those from other ~1 Ga inliers in Mexico and is consistent with a single Oaxaquia terrane by ~1 Ga.
Idioma
eng
ISSN
ISSN electrónico: 2007-2902; ISSN impreso: 1026-8774

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