The adakite connection of the Tuwu–Yandong copper porphyry belt, eastern Tianshan, NW China: trace element and Sr-Nd-Pb isotope geochemistry

Middle Cambrian to Permian subduction-related accretionary orogenesis of Northern Xinjiang, NW China: Implications for the tectonic evolution of central Asia

“…There are considerable mineral deposits in this accretionary complex (Qin, 2000;Qin et al, 2002;Rui et al, 2002;Han et al, 2006a,b;Zhang et al, 2004Zhang et al, , 2006. The N-S distribution of porphyry gold-copper, orogenic-type gold, and epithermal gold is similar to that in Alaska (Goldfarb, 1997), where NE-dipping subduction of the Pacific ocean has produced a progressive sequence from orogenic gold to porphyry gold-copper deposits.…”

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).…”

“…Although the major element contents of many A-type granites resemble those of the fractionated I-types, A-type granites contain higher total FeO, MnO, Na 2 O, Zr, Nb, Y, La, Ce, Sc, Zn, and Ga than both I-and S-type granites (Chappell and White, 1992). The Bailingshan granitoids contain low Zr, Nb, Y, Ce, and FeO T /MgO (1.8-5.5), and do (2014); data for the Tuwu plagiogranite porphyries from Zhang et al (2006); data for the adakites related to underplating in northern Xingjiang from Zhao et al (2008). The field of the Precambrian CAOB crust after Chen et al (2013).…”

Multiple mineralization events in the eastern Tianshan district, NW China: Isotopic geochronology and geological significance

“…The ore-bearing intrusions at Tuwu and Yandong are granodiorite porphyries (Liu et al, 2003;Zhang et al, 2006). The ages of the porphyries and the ores are given in Table 1.…”