U–Pb and Lu–Hf isotope systematics of lower crust from central-southern Mexico – Geodynamic significance of Oaxaquia in a Rodinia Realm

Zircon U-Pb, Hf and O isotope constraints on growth versus reworking of continental crust in the subsurface Grenville orogen, Ohio, USA

“…the Baltic Shield (Pedersen et al, 2009;Petersson et al 2013), in Mexico (Weber et al, 2010) and in the Gardar Province of south Greenland (Blaxland et al, 1978;Upton et al, 2003). This event is roughly coeval with emplacement of the Harp (1271 ±1 Ma; Cadman et al, 1993), Mackenzie (1267 ±2 Ma; Le Cheminant & Heaman 1989) and Sudbury (1238 ±4 Ma; Krogh et al, 1987) dyke swarms.…”

Laurentia-Baltica-Amazonia relations during Rodinia assembly

“…It is preserved in a series of basement inliers within the northern Andes of South America (e.g., Ramos, 2010, and references therein) as well as in the Oaxaquia terrane of Mexico, which has been placed between Baltica and Amazonia in the Rodinian reconstructions ( Oaxaquia terrane of Mexico, which would be accreted to northern Amazonia at that time (Solari et al, 2003). This event has been linked to collision between northern Amazonia and Baltica (Cardona et al, 2010;Ibanez-Mejia et al, 2011;Keppie et al, 2001;Keppie et al, 2004;Weber et al, 2010). Argon-argon ages in the range 970-920 Ma from the Colombian basement inliers are related to regional exhumation and cooling of the orogen (Cordani et al, 2005).…”

The Mesozoic successions of western Sierra de Zacatecas, Central Mexico: provenance and tectonic implications

“…La Pimienta, Las Pilas Volcanosedimentary Complex and La Escondida Phyllite also contain this zircon population, although in smaller proportions. Rocks with middle Mesoproterozoic – early Neoproterozoic ages constitute the metamorphic basement of eastern and southern Mexico, namely Oaxaquia (Ortega-Gutiérrez, Ruiz & Centeno-García, 1995; Keppie et al 2003; Solari et al 2003; Weber et al 2010, 2011; Trainor, Nance & Keppie, 2011). Is highly probable that crystalline basement was exposed during Triassic time, as suggested by continental Upper Triassic sandstones deposited directly above in NE Mexico (Ochoa-Camarillo, Buitrón & Silva, 1998; B. Ortega-Flores, unpub.…”