Prolonged magmatism, juvenile nature and tectonic evolution of the Chinese Altai, NW China: Evidence from zircon U–Pb and Hf isotopic study of Paleozoic granitoids

Magmatic sequences in the Halasu Cu Belt, NW China: Trigger for the Paleozoic porphyry Cu mineralization in the Chinese Altay–East Junggar

“…However, as the result of mixing model is against significant crustal contamination, combined with the similar conclusions obtained via studies in adjacent Chinese Altai by Yuan et al (2007) and Cai et al (2011), the high εHf(t) values could represent the nature of source comprising juvenile materials. Furthermore, the pre-and post-mineralization intrusions are characterized by relative lower εHf(t) values than synmineralization intrusions although all samples display enriched εHf(t) values (Figs.…”

Geochemistry, zircon U–Pb ages and Lu–Hf isotopes of early Paleozoic plutons in the northwestern Chinese Tianshan: Petrogenesis and geological implications

“…It is suggested that mantle-derived components or juvenile crust have played an important role in the generation of these granitoids in Central Asia Jahn et al, 2000Jahn et al, , 2004Sengör et al, 1993;Windley et al, 2007). Based on recent Hf and Nb isotopic studies, several important crustal growth events were proposed to have occurred in various parts of the CAOB during the Phanerozoic, namely at 280-306 Ma, 315-306 Ma and 345-463 Ma (Cai et al, , 2011Geng et al, 2009;Lei et al, 2011;Su et al, 2012;Sun et al, 2008;Tang et al, 2010bTang et al, , 2012aWang et al, 2011b;Xu et al, 2010;Yin et al, 2010Yin et al, , 2013Yuan et al, 2007;Zhang et al, 2012;and this study).…”

Mid-Ordovician and Late Devonian magmatism in the Togtokhinshil Complex: new insight into the formation and accretionary evolution of the Lake Zone (western Mongolia)

“…Similar zircon ages were also found in the granitic and volcanic rocks of the Chinese Altai Wang T et al 2006;Wang Y et al 2011;Yuan et al 2007;Sun et al 2009;Cai et al 2011) and the Gorny Altai (Glorie et al 2011;Cai et al 2014). …”

“…2008;Yarmolyuk et al 2008;Demoux et al 2009;Kröner et al 2010;Cai et al 2011Cai et al , 2014Glorie et al 2011;Hanžl et al this volume). Broadly similar ages of high-temperature metamorphism were reported from high-grade complexes of the Hovd Zone (Soejono et al 2015), the Tseel Terrane (Kozakov et al 2009;Windley et al 2007;Jiang et al 2012;Burenjargal et al 2014), the Gobi-Altai Zone (Broussolle et al 2015) and the Chinese Altai (Sun et al 2009;Jiang et al 2010;Cai et al 2011). Spatial and temporal coincidence of MidLate Devonian magmatic activity and high-temperature metamorphic event in the CAOB could be generally interpreted as a result of a widespread elevated geothermal gradient in the region.…”