Generation of the Early Cenozoic adakitic volcanism by partial melting of mafic lower crust, Eastern Turkey: Implications for crustal thickening to delamination

Phanerozoic amalgamation of the Alxa Block and North China Craton: Evidence from Paleozoic granitoids, U–Pb geochronology and Sr–Nd–Pb–Hf–O isotope geochemistry

“…These igneous rocks can be divided into Early Paleozoic (447?-423 Ma) and Late Paleozoic (345-337 Ma) stages. The Late Paleozoic high Sr/Y granites, generated by partial melting of thickened lower crust, were likely produced in an orogen (e.g., Chung et al, 2003;Wang et al, 2005Wang et al, , 2007bWang et al, , 2008bKarsli et al, 2010;He et al, 2011) or a cryptic suture zone (Su et al, 2013).…”

Late Cretaceous (ca. 90Ma) adakitic intrusive rocks in the Kelu area, Gangdese Belt (southern Tibet): Slab melting and implications for Cu–Au mineralization

“…Other models were also proposed to account for the genesis of the intermediate-acid rocks with geochemical characteristics similar to adakites (i.e., adakitic rocks): (a) crustal assimilation and fractional crystallization (AFC) process from parental basaltic magmas (Castillo et al, 1999;Macpherson et al, 2006); (b) mixing of felsic and basaltic magmas (Guo et al, 2007aStreck et al, 2007); (c) melting of thickened or delaminated lower crust (Atherton and Petford, 1993;Xu et al, 2002;Chung et al, 2003;Gao et al, 2004;Hou et al, 2004;Topuz et al, 2005;Wang et al, 2005Wang et al, , 2006aWang et al, ,b, 2007bWen et al, 2008a;Huang et al, 2008Huang et al, , 2009Karsli et al, 2010;He et al, 2011); (d) melting of subducted continental crust (Wang et al, 2008bXu et al, 2009). Based on geochronological and geochemical data for the Kelu quartz monzonites, we suggest that they were unlikely to have been produced by the latter four models, but by partial melting of subducted oceanic crust.…”

Relative contributions of crust and mantle to generation of Campanian high-K calc-alkaline I-type granitoids in a subduction setting, with special reference to the Harşit Pluton, Eastern Turkey

“…Al Paleocene and early Eocene (e.g., Okay and Tüysüz 1999). Then, Karsli et al (2010) claimed that the first stage of post-collision extensional events following crustal thickening started at *50 Ma. Accordingly, the R1-R2 classification diagram of the pluton, developed by Batchelor and Bowden (1985) to explain the specific tectonic setting, suggests a pre-plate collision phase for the Harşit rocks.…”