High-Mg Diorite from Qulong in Southern Tibet: Implications for the Genesis of Adakite-like Intrusions and Associated Porphyry Cu Deposits in Collisional Orogens

The role of Indian and Tibetan lithosphere in spatial distribution of Cenozoic magmatism and porphyry Cu–Mo deposits in the Gangdese belt, southern Tibet

“…Analytical accuracy for most trace elements is better than five relative percent. The detailed analytical methods and precision for most elements have been described by Yang et al (2015).…”

Paleozoic–Mesozoic Porphyry Cu(Mo) and Mo(Cu) Deposits within the Southern Margin of the Siberian Craton: Geochemistry, Geochronology, and Petrogenesis (a Review)

“…The major and trace (Ni, Cr) element compositions of the monzonite porphyry resemble that of high-Mg andesites (diorites) [121,122]. The high contents of Ni and Cr in monzonite porphyry probably imply melt equilibrium with mantle olivine in the mantle source.…”

“…Metasomatized mantle, as one of the possible sources, has been proposed to account for an origin as of high-Mg diorite/andesite [121]. The εNd(t) values in monzonite porphyries, ranging from −1.7 to −2.1, are slightly lower, while ( 87 Sr/ 86 Sr) i (0.70535) and LILE contents are slightly higher than those in gabbro ( Figures 15A and 16 andesites (diorites) [121,122]. The high contents of Ni and Cr in monzonite porphyry probably imply melt equilibrium with mantle olivine in the mantle source.…”

Tectonic Settings of Potassic Igneous Rocks

“…From Müller et al (1992a) et al 2014; Liu et al 2014;Wang et al 2014;Aghazadeh et al 2015). However, there is a general consensus that potassic magmas cannot be derived by partial melting of normal mantle peridotite, but require heterogeneous mantle sources which have been metasomatically enriched in LILE and LREE (Edgar 1987;Foley and Peccerillo 1992;Guo et al 2013;Kuritani et al 2013;Tan et al 2013b;Bucholz et al 2014;Aghazadeh et al 2015;Yang et al 2015).…”

“…Potassic igneous rocks are commonly enriched in LILE, LREE, volatiles such as H 2 O, and halogens, particularly Cl and F (Aoki et al 1981;Bailey and Hampton 1990;Foley 1992Foley , 1994Zhang et al 1995;Müller et al 2001;Guo et al 2006;Chevychelov et al 2008;Zajacz et al 2010;Melluso et al 2012;Yang et al 2015). However, average estimated maximum H 2 O contents of typical mantle material, such as garnet-lherzolite or eclogite, are generally <1.2 wt% (Leech 2001) and single-stage partial melting of such rocks would not produce the volatile-rich and fertile melts with sufficient H 2 O contents capable to produce porphyry copper-gold mineralization (i.e.…”