1.3–0.9Ga Oaxaquia (Mexico): Remnant of an arc/backarc on the northern margin of Amazonia

The Grenville-age basement of the Andes

“…Besides, the geological evolution of Oaxaquia and Arequipa presents many common events as the age of the main arc magmatism, the presence of Grenvillian anorthosites, the peak of metamorphism, the isotopic composition, and the early Paleozoic cover (Ramos, 2009;Keppie and Ortega-Gutiérrez, 2010). The detrital zircons of the present sedimentary cover of Oaxaquia terrane (Fig.…”

Zircon U–Pb–Hf isotopes and geochemistry of two contrasting Neoarchean charnockitic rock series in Eastern Hebei, North China Craton: Implications for petrogenesis and tectonic setting

“…(4) Previous investigations revealed that charnockitic magmatism can be formed in Archean (Pouclet et al, 2007;Rajesh, 2012;Shaji et al, 2014), Proterozoic (Peng et al, 2012;Yang and Santosh, 2015), and Phanerozoic Yin et al, 2013;Zhang et al, 2011) subduction-related environments. These magmas were generally derived from partial melting of the subducted slab or arc root materials that were heated by the upwelling hot, dry, and potassium enriched magmatism from deep mantle in specific dynamic mechanisms of slab window (Yin et al, 2013;Zhang et al, 2011), ridge subduction (Peng et al, 2012;Yang and Santosh, 2015;Zhang et al, 2010), or back-arc extension (Chiarenzelli et al, 2010;Fernández et al, 2008;Keppie and Ortega-Gutiérrez, 2010). Therefore, the magmatic precursors of the charnockite series in the Yuhuzhai-Taipingzhai area were likely emplaced in a Neoarchean back-arc-related environment.…”

Pre-Mesozoic origin and paleogeography of blocks in the Caribbean, South Appalachian and West African domains and their impact on the post “variscan” evolution

“…According to Keppie and Ortega-Gutierrez [2010] it is related to a Grenvillian (1200-950 Ma) volcanic or back-arc basin located on the northwestern margin of the Amazonian craton. According to Keppie and Ortega-Gutierrez [2010] it is related to a Grenvillian (1200-950 Ma) volcanic or back-arc basin located on the northwestern margin of the Amazonian craton.…”

“…-The Mixteco block (including the Acatlan complex) displaying U/Pb ages on zircons ranging from 1400 to 440 Ma [Yanez et al, 1991;Ortega-Gutierrez et al, 1999;Murphy et al, 2006;Nance et al, 2006;Vega-Granillo et al, 2007] Linneman et al [2004] indicate a "source Grenvillian zircons and recycled Grenvillian zircons" for all those Mexican blocks but according to Nance and Linnemann [2008] and Keppie and Ortega-Gutierrez [2010] the "Oaxaquia" and "Chortis" blocks are very similar with ages at circa 1250 to 1000 Ma. A COB origin is postulated for them.…”