Late Mesozoic time constraints on tectonic changes of the Luanchuan Mo belt, East Qinling orogen, Central China

Geochronology, geochemistry, and Hf isotopes of the Jiudinggou molybdenum deposit, Central China, and their geological significance

“…The Rb/Sr ratio of <0.9 can also be indicative of I-type granites, indicating that the Daping pluton, with the Rb/Sr ratios between 0.547 and 0.823, can be classified as I-type granites (Meng, 2010). The Daping pluton is, thus, a typical highly fractionated Itype granite as are the other Yanshanian molybdenumrelated granitoid plutons in the EQMB (Xu et al, 1995;Bao et al, 2009Bao et al, , 2014Dai et al, 2009;Jiao et al, 2010;Zhu et al, 2010;Li et al, 2012).…”

“…The molybdenum production in the Luanchuan ore district is from the Nannihu-Sandaozhuang and Shangfang superlarge molybdenum deposits and a few medium to small molybdenum deposits such as the Zhuyuangou, Dongyuku, and Maquan deposits. The greater Luanchuan ore district consists of three subdistricts: the Nannihu (NNH) ore district, the (SBG) ore district, and the Chitudian (CTD) ore district (Wang et al, 2008;Bao et al, 2009;Li et al, 2012) (Fig. 1C).…”

“…1C). A number of studies in the Luanchuan area during the previous several decades have yielded a large amount of geochronologic and geochemical data related to these molybdenum deposits and the molybdenum-related granitoid plutons (Bao et al, 2009(Bao et al, , 2014Li et al, 2012;Yang et al, 2012aYang et al, , 2012bYang et al, , 2013. Most of the known molybdenum deposits are located in the Nannihu and Shibaogou ore districts, and only a few lead-zinc deposits have been reported in the Chitudian ore district.…”

Petrogenesis of the Mesozoic granites and Mo mineralization of the Luanchuan ore field in the East Qinling Mo mineralization belt, Central China

“…Ages of granite plutons and mineralization. ~135 Ma) were derived mainly from partial melting of subducted continental crust of the Yangtze Block (Bao et al, 2009a;Li et al, 2012a).…”

“…In this fashion, the Jurassic to Early Cretaceous (N 131 Ma) granites are considered to be related to the transformation of the tectonic regime from NS-to nearly EWdirections in East China, i.e., a continental margin arc setting controlled by the subduction of the Izanagi or Paleo-Pacific plate beneath the Eurasian continent in a WNW-ESE direction in the Late Jurassic-Early Cretaceous, whereas the emplacement of younger granites (b131 Ma) can be ascribed to large-scale lithospheric thinning beneath the North China Craton Li et al, 2005Li et al, , 2013aMao et al, 2005Mao et al, , 2008Mao et al, , 2010Zhang et al, 2010). Other workers suggested that the Late Jurassic to Early Cretaceous granites in the East Qinling resulted from remelting of the lower crust in post-orogenic stage (Zhu et al, 2010a) or remelting of subducted crust in post-collisional setting (Bao et al, 2009a;Li et al, 2012a).…”