A-type granites in northeastern China: age and geochemical constraints on their petrogenesis

An Early Permian (ca. 280Ma) silicic igneous province in the Alxa Block, NW China: A magmatic flare-up triggered by a mantle-plume?

“…1b). In this scenario, the post-collisional A-type granites occurred in lithospheric extensional regimes due to the upwelling of the asthenosphere caused by the lithospheric delamination (e.g., Ilbeyli et al, 2004;Wu et al, 2002;Zhang et al, 2007). The association of coeval voluminous granites and minor mafic rocks in the Alxa Block is also similar to other proposed examples of lithospheric delamination, such as Mesozoic South China (e.g., Li and Li, 2007), Mesozoic North China (e.g., Wu et al, 2008) and the Late Paleozoic Iberia (e.g., Gutiérrez-Alonso et al, 2011).…”

Geochronology, geochemistry and geodynamic implications of the Late Mesozoic volcanic rocks in the southern Great Xing’an Mountains, NE China

“…Similarly, the e Nd (t) values of the volcanic rocks also show a trend of mixing between juvenile crust and old crust components, as well as the Phanerozoic A-type granitoids in NE China ( Fig. 7b; Wu et al, 2002).…”

“…The eastern part of the CAOB is termed as the Xingmeng (Xing'an-Mongolian) orogenic belt in the Chinese literature. The Xingmeng orogenic belt represents a collage of four microcontinental blocks, in which the Songliao, Xing'an and Erguna blocks were amalgamated in Paleozoic, and the Jiamusi block docked to the east of Songliao block in Mesozoic (Wu et al, 2002(Wu et al, , 2011. The Xing'an block comprises the Great Xing'an Range and Halar Basin.…”

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

“…Indeed, adakitic rocks from the LYRB in SE China have been considered as melts of eclogitic or delaminated lower crust (Xu et al, 2002;Wang et al, 2006Wang et al, , 2007a. In addition, the Early Cretaceous magmatism and lithospheric deformation in the NCC and Sulu-Dabie orogen were genetically linked to delamination of a thickened lithosphere (Wu et al, 2002;Gao et al, 2008). Mckenzie and Priestley (2008) even considered that crustal thinning has occurred all along the East Asian margin from the south of the Lake Baikal.…”

“…Although lithospheric thinning and large-scale magmatic activity in eastern China have widely been considered to be associated with subduction of the Paleo-Pacific Plate, the relationship between them remains unresolved. 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).…”