Contrasting Sources and Related Metallogeny of the Triassic and Jurassic Granitoids in the Chifeng–Chaoyang District, Northern Margin of the North China Craton: A Review with New Data

Understanding of the mechanism between magma sources and metallogeny is still vague. As an important gold molybdenum producing area, Chifeng–Chaoyang district, located at northern margin North China Craton (NCC), a key place for this issue. New geochemical data relating to Taijiying gold-deposit-related granites are presented. These data, coupled with previous studies, used explore relationship mineralization processes. Two major magmatic periods, Middle Triassic (220–230 Ma) Late Jurassic (150–160 Ma), identified based on compiled data. The rocks mostly fractionated I-type A-type granites, including monzogranite, biotite granite, syenogranite. They have low initial 87Sr/86Sr values (0.7050), moderately enriched εNd(t)–εHf(t) (−8.5 −5.6), relatively young Nd–Hf model ages (TDM2-TDMC) (1.47–1.57 Ga). features indicate that more Archean–Paleoproterozoic mantle-derived materials were involved in their sources. On other hand, high-K calc-alkaline series mainly consist leucogranite, granodiorite. high Na2O/K2O, Sr/Y, La/Yb ratios Y Yb contents. adakitic suggest existence thickened lower crust. Their significant negative (−15.0 −12.8) older (TDM2–TDMC) (2.17–2.11 Ga) consistent derivation from ancient crust, indicating activation NCC. It proposed change main source resulted tectonic transition during early Mesozoic decratonization, is, post-collisional extension subduction Paleo-Pacific plate beneath East Asia Jurassic. Comparative analysis suggests medium–large-scale deposits grade closely related granites; however, most formed decratonization NCC experienced controlled mineralizations different stages by changing This pattern beneficial understanding metallogenesis district.