The high-Mg mafic dykes from the Singhbhum Granitoid Complex in East India have geochemical characteristics[e.g.,enrichment of the large ion lithophile elements and light rare earth elements(LREEs) relative to high field strength elements(HFSEs):high-MgO(>8%),high-SiO_2(>52%),low-TiO_2(<0.5%),and high CaO/Al_2O_3(>0.58)]similar to those found in boninitic/noritic rocks.Their high percentage of orthopyroxene as a mafic mineral and of plagioclase as a felsic mineral,and normative hypersthene content greater than diopside content are also indications of their boninitic/noritic affinity.On a triangular diagram of MgO-CaO-Al_2O_3 and on binary diagrams of Ti/V vs Ti/Sc and TiO_2 vs Zr,these samples show geochemical similarities with Phanerozoic boninites and Paleoproterozoic high-Mg norites.On major and trace element variation diagrams,these dykes show a normal crystallization trend and their Nb/La(<0.5) and Nb/Ce(<0.21) values lower than average bulk crust(0.69 and0.33,respectively) suggest no crustal contamination.Their low values of Rb/Sr(0.11-0.41) and Rb/Ba(0.10-0.27)also suggest little or no effect of post magmatic processes.Their TiO_2(0.27-0.50),Al_2O_3/TiO_2(19.30-42.48),CaO/TiO_2(12.96-32.52),and Ti/V(12-18) values indicate derivation from a depleted mantle source under oxidizing conditions such as a mantle wedge.Ni vs Zr modeling shows that the studied high-Mg dykes were generated by25-30%melting of a refractory mantle source.Enrichment of Rb,Th,U,Pb,Sr,and LREEs,and depletion of HFSEs—especially Nb,P,Ti,Zr—on primitive mantle—and chondrite-normalized spider diagrams,respectively,are clear signals that the slab-derived component played an important role in the formation of melts for these rocks in a supra-subduction zone setting. The high-Mg mafic dykes from the Singhbhum Granitoid Complex in East India have geochemical characteristics [eg, enrichment of the large ion lithophile elements and light rare earth elements (LREEs) relative to high field strength elements (HFSEs): high-MgO (> High-SiO 2 (> 52%), low-TiO 2 (<0.5%), and high CaO / Al 2 O 3 (> 0.58)] were similar to those found in boninitic / noritic rocks.Their high percentage of orthopyroxene as a mafic mineral and of plagioclase as a felsic mineral, and normative hypersthene content greater than diopside content are also indications of their boninitic / noritic affinity. On a triangular diagram of MgO-CaO-Al 2 O 3 and on binary diagrams of Ti / V vs Ti / Sc and TiO 2 vs Zr, these samples show geochemical similarities with Phanerozoic boninites and Paleoproterozoic high-Mg norites. Major major and trace element variation diagrams, these dykes show a normal crystallization trend and their Nb / La (<0.5) and Nb / Ce (<0.21 ) values ​​lower than the average bulk crust (0.69 and 0.33, respectively) sugges t no crustal contamination.Their low values ​​of Rb / Sr (0.11-0.41) and Rb / Ba (0.10-0.27) also suggest little or no effect of post magmatic processes.Their TiO 2 (0.27-0.50), Al 2 O 3 / TiO 2 -42.48), CaO / TiO_2 (12.96-32.52), and Ti / V (12-18) values ​​indicate derivation from a depleted mantle source under oxidizing conditions such as a mantle wedge. Ni vs Zr modeling shows that the studied high-Mg Enrichment of Rb, Th, U, Pb, Sr, and LREEs, and depletion of HFSEs-especially Nb, P, Ti, Zr-on primitive mantle-and chondrite- normalized spider diagrams, respectively, are clear signals that the slab-derived component played an important role in the formation of melts for these rocks in a supra-subduction zone setting.