Geochemical contrasts between early Cretaceous ore-bearing and ore-barren high-Mg adakites in central-eastern China: Implications for petrogenesis and Cu–Au mineralization

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

“…Thus, the adakites display high Sr/Y and (La/Yb) n ratios, which show geochemical affinities similar to those of modern adakites (Fig. 8) (Defant and Drummond, 1990;Ling et al, 2013a;Liu et al, 2010a;Sun et al, 2012a). These adakites are enriched in LREEs and most of these lack significant negative Eu anomalies, reflecting both the presence of residual garnet and the absence of plagioclase in the source region (Fig.…”

Early Cretaceous potassic volcanic rocks in the Jiangnan Orogenic Belt, East China: Crustal melting in response to subduction of the Pacific–Izanagi ridge?

“…Although the origin of Mesozoic magmatism in SE China has widely been attributed to subduction of the Paleo-Pacific Plate (Zhou and Li, 2000;Li and Li, 2007;Sun et al, 2007Sun et al, , 2010Yan et al, 2008;Jiang et al, 2009Jiang et al, , 2011Li et al, , 2013Liu et al, 2010;Xie et al, 2011;Tang et al, 2013;Yang et al, 2014), typical subduction-related magmas (e.g., tholeiitic to calk-alkaline basalts and andesites, Harry and Green, 1999) are lacking in the area. Instead, high-T potassic and felsic volcanic lavas and their intrusive counterparts are common (Wang et al, 2006).…”

“…The origin of the Mesozoic adakitic rocks in eastern China did not require a thickened crust, except for those adakitic rocks from the continental collisional orogens (i.e., SuluDabie orogens, Ma et al, 2015). Instead, increasing evidence has been presented to support the view that the Mesozoic adakitic rocks in SE China were likely generated by melting of oceanic crust (Sun et al, 2007(Sun et al, , 2010Ling et al, 2009Ling et al, , 2011Liu et al, 2010).…”

“…Some geologists invoked a lithospheric delamination model to interpret the removal of the cold and thick lithosphere beneath the North China Craton (Wu et al, 2002;Gao et al, 2008), and even in the lower Yangtze region (e.g., Xu et al, 2002, Wang et al, 2006, 2007a. In SE China, the origin of the Mesozoic igneous events and mineralization was attributed to flat-slab subduction and subsequent foundering of the subducting slab Li et al, , 2013, or else formed in a back-arc extensional tectonic setting (Yan et al, 2008;Liu et al, 2010;Jiang et al, 2011;Tang et al, 2013;Xie et al, 2011;Yang et al, 2014). Alternatively, some recent studies have proposed a genetic link between the Mesozoic magmatism and mineralization in East Asia related to a slab window coupled with ridge subduction (Sun et al, 2007(Sun et al, , 2010Li et al, 2011Li et al, , 2012.…”

Late Early Cretaceous adakitic granitoids and associated magnesian and potassium‐rich mafic enclaves and dikes in the Tunchang–Fengmu area, Hainan Province (South China): Partial melting of lower crust and mantle, and magma hybridization

“…1a). In recent years, many Jurassic-Cretaceous adakitic intrusive rocks (intermediate-acidic rocks characterized by a depletion of Y and heavy rare earth elements (HREEs), and high Sr/Y and La/Yb ratios) have been documented in the eastern Yangtze Block (e.g., Xu et al, 2002a;Wang et al, 2004aWang et al, , b, 2006aHuang et al, 2008;Xie et al, 2008;Li et al, 2009;Ling et al, 2009;Liu et al, 2010a;Sun et al, 2011). Only very minor occurrences of adakitic rocks have been reported in the central part of the Cathaysia Block, (e.g., Xiong et al, 2003), however, despite the widespread occurrence of Mesozoic intrusive rocks in the region.…”