Contribution of mantle components within juvenile lower-crust to collisional zone porphyry Cu systems in Tibet

The formation of Qulong adakites and their relationship with porphyry copper deposit: Geochemical constraints

“…(Hou et al, 2004b;Qin et al, 2014) and this study, Gangdese Miocene adakites (Gao et al, 2010a;Hou et al, 2004bHou et al, , 2012Wang et al, 2010;Xu et al, 2010), Yarlung Tsangpo ophiolite (Miller et al, 2003;Niu et al, 2006;Xu and Castillo, 2004;Zhang et al, 2005), Linzizong volcanic rocks (Gao et al, 2008;Mo et al, 2007), Indian Ocean pelagic sediment (Benothman et al, 1989), Himalayan basement (Vidal et al, 1982). Cretaceous adakites: Zhu et al (2009);Jurassic porphyries: Yang et al (2011); Miocene adakites: Gao et al (2010b), Hou et al (2013), Hou et al (2004b) and Wang et al (2010). Lhasa crustal basement and the lower crust component of the Lhasa terrane proposed by Zhu et al (2012a) and Miller et al (1999) respectively.…”

“…12. Also plotted are literature data for Jurassic porphyries from Qulong , Cretaceous adakites from Mamen ), Lizizong volcanics (Mo et al, 2008) and Miocene adakites Hou et al, 2004bHou et al, , 2013Qin et al, 2014;Xu et al, 2010) and fields of Indus-Yalung ophiolites (Miller et (Zhu et al, 2012a) and ultrapotassic rocks from south Tibet (Gao et al, 2007a;Liu et al, 2014;Miller et al, 1999;Zhao et al, 2009). The Nd-isotope model ages (T DM ) of the Qulong adakites range from 0.62 to 0.71 Ga (Table 4).…”

Geochronology and geochemistry of igneous rocks in the Bailingshan area: Implications for the tectonic setting of late Paleozoic magmatism and iron skarn mineralization in the eastern Tianshan, NW China

“…11). Previous studies indicate that the juvenile crustal components in arc systems can be sourced either from crustal underplating during back-arc extension (McKenzie, 1989;Vervoort and Blichert-Toft, 1999;Mišković and Schaltegger, 2009) or from melting of a subducted oceanic slab (Zhang et al, 2006;Richards and Kerrich, 2007;Hou et al, 2013). However, significant slab melting is precluded by the low Sr/Y and (La/Yb) N values ( Table 1).…”

Double-layer structure of the crust beneath the Zhongdian arc, SW China: U–Pb geochronology and Hf isotope evidence

“…230 Ma indicate that the westwards subduction of the Ganzi-Litang oceanic crust had already started in the early Late Triassic (Wang et al, 2013b). Meanwhile, the Late Triassic porphyries in the Zhongdian arc were formed during a transient Wang et al (2011) andChen et al (2014); Hongshan porphyries from Huang (2013); Chundu porphyries from Chen et al (2014); Xiaxiaoliu basalt from Ren (2011); Cordillera Blanca adakitic intrusions from Petford and Atherton (1996); adakitic intrusions of the Gangdese porphyry Cu belt in Tibet from Hou et al (2004aHou et al ( , 2013b; oceanic slab-derived adakites from Kay (1978), Kay and Kay (1993), and Stern and Kilian (1996); late Permian mafic rocks from the SongpanGanzi and western Yangtze blocks from Q. Wang et al (2008); Neoproterozoic igneous and metamorphic rocks from the Songpan-Ganzi and western Yangtze blocks from Roger and Calassou (1997) period with a concentration of ages at ca.…”