Ordovician and Late Paleozoic–Early Mesozoic tectonothermal history of the La Noria area, northern Acatlán Complex, southern Mexico: Record of convergence in the Rheic and paleo-Pacific Oceans

U–Pb geochronological constraints on the Triassic–Jurassic Ayú Complex, southern Mexico: Derivation from the western margin of Pangea-A

“…Despite the large amount of recently published geochemical and geochronological data for rocks of the Acatlán Complex (e.g. Talavera-Mendoza et al, 2005;Keppie et al, 2006b;Murphy et al, 2006;Keppie and Dostal, 2007;Middleton et al, 2007;Miller et al, 2007;Grodzicki et al, 2008;Hinojosa-Prieto et al, 2008;Morales-Gámez and Keppie, 2008;RamosArias et al, 2008;Dostal and Keppie, 2009;Galaz Escanilla et al, 2009;Morales-Gámez et al, 2009aOrtega-Obregón et al, 2009;VegaGranillo et al, 2009aVegaGranillo et al, , 2009bOrtega-Obregón et al, 2010), the interpretation of its geological development throughout the Paleozoic remain controversial (Talavera-Mendoza et al, 2005;Nance et al, 2006b;Keppie et al, 2008b;Vega-Granillo et al, 2009a). Although these authors disagree on the paleogeographic location (and hence the relationship of these rocks to the amalgamation of Pangea), they generally agree that the Late Paleozoic history of the Acatlán Complex records subduction-related arc magmatism dominated by the Permian Totoltepec pluton and the broadly synchronous deposition of clastic rocks of the Tecomate Formation in the eastern Acatlán Complex.…”

“…Ordovician to earliest Silurian zircon populations are most likely derived from a suite of megacrystic granitoid rocks, which are part of a rift-related bimodal intrusive suite within the Acatlán Complex (Middleton et al, 2007;Miller et al, 2007;Vega-Granillo et al, 2007;Hinojosa-Prieto et al, 2008;Keppie et al, 2008a;Fig. 8).…”

Geochemistry of low-grade clastic rocks in the Acatlán Complex of southern Mexico: Evidence for local provenance in felsic–intermediate igneous rocks

“…On the other hand, more recent data suggests an alternative sequence: (a) deposition of Ordovician rift-passive margin clastic rocks synchronous with intrusion bimodal igneous rocks including rift tholeiites (Keppie et al, 2008a;Morales-Gámez et al, 2008;Hinojosa-Prieto et al, 2008); (b) Carboniferous-Permian deposition of clastic rocks and tectonically interleaved tholeiitic basalts (Keppie et al, , 2008bGrodzicki et al, 2008) that was synchronous with Mississippian extensional exhumation of high pressure, subduction-related rocks (eclogites and blueschists: Keppie et al, 2008a), and Permian intrusion of arc-related igneous rocks .…”

Palaeozoic palaeogeography of Mexico: constraints from detrital zircon age data

“…1): (1) the sedimentary cover of the c. 1 Ga Oaxacan Complex in southern Mexico, the largest exposed portion of the Oaxaquia terrane (Gillis et al 2005); (2) metasedimentary rocks of the largely Palaeozoic Acatlán Complex, which forms the basement of southern Mexico's Mixteca terrane (Sánchez-Zavala et al 2004;Talavera-Mendoza et al 2005;Keppie et al 2006a;Murphy et al 2006;Vega-Granillo et al 2007;Grodzicki et al 2008;Hinojosa-Prieto et al 2008;Morales-Gámez et al 2008); and (3) the Palaeozoic Granjeno Schist of northeastern Mexico's Sierra Madre terrane, which is tectonically juxtaposed against the second largest exposure of the Oaxaquia terrane, the c. 1 Ga Novillo Gneiss (Nance et al 2007b). …”

“…Talavera-Mendoza et al 2005;Murphy et al 2006;Miller et al 2007;Vega-Granillo et al 2007) and were exhumed in the Late Devonian -early Mississippian (Middleton et al 2007); (2) pre-Silurian low-grade metasedimentary rocks that are thought to represent a ?Cambro-Ordovician rift-passive margin clastic sequence (El Rodeo Formation and Amate, Canoas, Huerta, El Epazote and Las Calaveras units) and are associated with bimodal, rift-related igneous rocks and intruded by Ordovician megacrystic granitoids (e.g. Keppie et al 2007Keppie et al , 2008bMiller et al 2007;Hinojosa-Prieto et al 2008;Grodzicki et al 2008;Morales-Gámez et al 2008;Ramos-Arias et al 2008); (3) Devonian-Carboniferous low-grade metasedimentary rocks that include phyllite, quartzite and minor mafic volcanic rocks (Cosoltepec Formation, Salida and Coatlaco units), the deposition of which was coeval with exhumation of the high pressure rocks (Grodzicki et al 2008;Morales-Gámez et al 2008); (4) Carboniferous -Permian low-grade metasedimentary rocks that form a continental-shallow marine succession dominated by slate, sandstone, conglomerate and limestone (Tecomate, Olinalá and Patlanoaya formations), the deposition of which was coeval with Permo -Triassic arc magmatism (Torres et al 1999;Malone et al 2002) and which are locally overthrust by the broadly coeval (c. 288 Ma), arc-related Totoltepec pluton (Yañez et al 1991;Keppie et al 2004a); and (5) Permian -Triassic high-grade metasedimentary rocks (Petlalcingo Suite) that are thought to represent an active margin clastic wedge (Keppie et al 2006a) and comprise pelites, psammites and minor mafic units (Magdalena protolith and Chazumba Formation) that were metamorphosed in the amphibolite facies and locally pervasively migmatized in the mid-Jurassic.…”