Geochemistry and U-Pb-Lu-Hf zircon isotopes of Cu (±Au ± Mo) hosted granitoids of Malanjkhand pluton, Central India: Implications on petrogenesis, source, and crustal evolution

摘要: Abstract The early Paleoproterozoic granitoids (2.45–2.5 Ga) at Malanjkhand and surrounding regions, referred herein to as (MG), host Cu (±Mo ± Au) deposit. MG lie in the south of Central Indian Tectonic Zone (CITZ), forming an integral part Bastar Craton. Whole-rock geochemistry, zircon U-Pb-Lu-Hf isotopes are presented with aim insight into petrogenesis its implication on crustal evolution U-Pb geochronology suggests formation pluton least by three felsic magmatic pulses generated 2.50, 2.47, 2.45 Ga. Geochemically both mineralized unmineralized broadly identical. They bear moderately high Sr/Y (La/Yb)N similar adakite-like melt. However, typical non-slab-melt (young or old) origin can be predicted. observed geochemical signatures may result from interactions mantle-derived mafic melt a derived pre-existing continental crust. It has been argued that is essentially formed partial melting slab-melt metasomatised mantle/enriched mantle. Subsequently fractionated form cumulates. On other hand, was Archean sub- ultra-chondritic ɛHf(2.47Ga) zircons (−4.69 +2.87) TDMc ages (2.79–3.25 propound ancient juvenile sources. (2.45–2.50 together synchronous volcano-plutonic complexes nearby Dongargarh region might have played significant role rapid growth Craton ~2.5