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

Malanjkhand及其周围地区的早期古元古代花岗岩（2.45-2.5 Ga），在本文中称为Malanjkhand花岗岩（MG），含铜（±Mo±Au）矿床。MG位于中部印度构造区（CITZ）的南部，是Bastar Craton不可或缺的一部分。提出了全岩石地球化学，MG的锆石U-Pb-Lu-Hf同位素，旨在洞察MG的岩石成因及其对Bastar Craton地壳演化的意义。U-Pb锆石的地质年代学表明，至少由在2.50、2.47和2.45 Ga产生的三个长英质岩浆脉冲形成了MG岩钉。在地球化学上，矿化和未矿化的MG大致相同。它们具有较高的Sr / Y和（La / Yb）_N类似于像akakite的熔体。但是，可以预测其典型的非板状融化（年轻或古老）起源。观察到的地球化学特征可能是由于地幔衍生的镁铁质熔体与源自早已存在的大陆壳的长英质熔体的相互作用所致。有人认为，镁铁质熔体本质上是由板状融化的交代化地幔/富集地幔的部分熔融形成的。随后，黑铁矿熔体分馏以形成堆积物。另一方面，长英质熔体是由太古宙大陆壳的熔融形成的。观察到的亚超ultra化ɛHf _（2.47Ga）锆石（−4.69至+2.87）和T _DM ^c年龄（2.79–3.25 Ga）暗示了古和少年地壳来源的重金属的起源。形成MG的岩浆脉冲（2.45-2.50 Ga）以及来自附近Dongargarh地区的同步火山-火山岩复合体可能对Bastar Craton在约2.5 Ga的快速地壳生长起了重要作用。