Memoir 197: Proterozoic Tectonic Evolution of the Grenville Orogen in North America 2004
DOI: 10.1130/0-8137-1197-5.755
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U-Pb geochronology and Pb isotopic compositions of leached feldspars: Constraints on the origin and evolution of Grenville rocks from eastern and southern Mexico

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Cited by 43 publications
(48 citation statements)
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“…All of these terranes expose basement of Grenville age (Oaxaquia and Chortis Block) or late Neoproterozoic age (Keppie and Ortega-GutiØrrez 1999). The Grenville-age basement is isotopically transitional between that of the Grenville Belt and the basement massifs of Grenville age in the northern Andes of Columbia (Ruiz et al 1999), which has been related to mixing of juvenile Grenville and Archean sources (Cameron et al 2004). The Maya terrane is thought to have been contiguous with the Florida basement until the opening of the Gulf of Mexico in the Mesozoic (e.g.…”
Section: Middle American Terranesmentioning
confidence: 98%
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“…All of these terranes expose basement of Grenville age (Oaxaquia and Chortis Block) or late Neoproterozoic age (Keppie and Ortega-GutiØrrez 1999). The Grenville-age basement is isotopically transitional between that of the Grenville Belt and the basement massifs of Grenville age in the northern Andes of Columbia (Ruiz et al 1999), which has been related to mixing of juvenile Grenville and Archean sources (Cameron et al 2004). The Maya terrane is thought to have been contiguous with the Florida basement until the opening of the Gulf of Mexico in the Mesozoic (e.g.…”
Section: Middle American Terranesmentioning
confidence: 98%
“…1 Ga) age (Keppie andOrtegaGutiØrrez 1995, 1999), overlain unconformably by Lower Ordovician rocks containing a Gondwanan fauna (Robison and Pantoja-Alor 1968 revised by Shergold 1975;Boucot et al 1997). The basement is isotopically distinct from that of the North American Grenville Belt and its Pb isotopic signatures are due to mixing of Archean and juvenile Grenville sources (Ruiz et al 1999;Cameron et al 2004).…”
Section: Geologic Settingmentioning
confidence: 99%
“…The following sequence of Precambrian events is recorded in the Novillo Gneiss (after Cameron et al, 2004;and Keppie et al, 2006) …”
Section: Novillo Gneissmentioning
confidence: 99%
“…1 Ga rocks of nuclear Mexico and the Chiapas Massif (Ortega-Gutiérrez et al, 1995), but this term has gradually been expanded as ''greater Oaxaquia" to include all or parts of the Mixteca and Chortis terranes (e.g. Cameron et al, 2004), collectively named the Middle America terrane by Keppie (2004).…”
Section: Introductionmentioning
confidence: 99%
“…La unidad más antigua es el Gneis Novillo (GN), que tiene edades de alrededor ~1 Ga, y constituye un complejo metamórfico formado por rocas metasedimentarias intrusionadas por cuerpos gabro-anortosíticos (~1010-1035 Ma y ~1115-1235 Ma; Cameron et al, 2004). Esta unidad fue afectada por deformación polifásica y metamorfismo en facies granulíticas (990 ± 5 Ma; Cameron et al, 2004) y un emplazamiento anortosítico pegmatítico post-tectónico de 978 ± 13 Ma (análisis de U-Pb en zircones; Cameron et al, 2004). Este complejo es cortado, al menos, por dos enjambres de diques máficos (550 Ma; Keppie et al, 2006).…”
Section: Contexto Geológico Localunclassified