An association of tonalite-trondhjemite-granodiorite (TTG), other granitoids and greenstones constitute the Paleoarchean-Mesoarchean Singhbhum craton in India. The deformed and metamorphosed greenstone succession of Badampahar-Gorumahisani belt (BGB) in eastern Singhbhum consists of mafic–ultramafic volcanics, intercalated chemical sediments in the lower part and clastic sediments in the upper part. Geology, structure and geochemistry of BGB mafic volcanics, contemporaneous TTG and slightly younger intrusive granite have been integrated to constrain the tectonic setting of Paleoarchean felsic crust generation and coupled deformation of granite-greenstone. Subalkaline, low-K BGB metabasalts show distinct tholeiitic trend of differentiation from komatiitic basalt parent magma. BGB metabasalts with LILE enrichment, negative Nb anomaly, and Ti/V ratio in the range 10–20, are comparable to island arc tholeiites, though the associated komatiites and high-Mg basalts suggest plume related origin. Limited crustal contamination of a komatiitic basalt magma cannot be ruled out altogether. Singhbhum granite batholith with older tonalite-trondhjemite and younger granite-granodiorite plutons were derived from low- to high-K mafic source, together with some TTG reworking for younger granites. With low HREE, higher primordial mantle normalized La/Yb ratio, insignificant Eu anomaly, and coupled depletion of Y and enrichment of Sr, older strongly deformed plutons compare well with the Archean TTG suite. The younger intrusive granites show weak positive Eu anomaly (Eu/Eu* ~ 1.3–1.7) and strongly positive Y anomaly. Geochemical discrimination (e.g. Rb vs Y + Nb) suggests comparison with volcanic arc granites, which is also supported by enrichment of LILE (K, Rb and Ba) and LREE, and relative depletion of HREE and HFSE. However, structural geometry of BGB and adjoining granitoid plutons, association with komatiite, absence of typical signatures of derivation from subduction wedge, and heterogeneity of source for the BGB mafic volcanics, suggest Paleoarchean crustal accretion by mantle plume activity as well as local shallow subduction or subcretion under a transitional tectonic regime.

斜长白岩-长生硬岩-闪长闪长岩（TTG），其他花岗岩和绿岩的组合构成了印度的古古埃及-中古埃及的Singhbhum克拉通。Singhbhum东部Badampahar-Gorumahisani带（BGB）的变形和变质绿岩演替包括镁铁质-超镁铁质火山岩，下部的插层化学沉积物和上部的碎屑沉积物。BGB镁铁质火山岩，同时期的TTG和较年轻的侵入性花岗岩的地质，结构和地球化学已被整合在一起，以约束古太古代长英质地壳生成的构造环境以及花岗岩-绿岩的耦合变形。亚碱性低K BGB玄武岩表现出明显的分化趋势，与科马蒂玄武岩母岩浆有区别。具有LILE富集，负Nb异常的BGB玄武岩，Ti / V比值在10–20范围内，可与岛弧型辉绿岩相提并论，尽管相关的科马提岩和高镁玄武岩暗示了羽状相关。不能完全排除日光岩玄武岩浆的有限地壳污染。Singhbhum花岗岩基岩与较老的斜长石-长白铁矿和较年轻的花岗岩-角闪闪岩岩体来自低钾至高K镁铁质来源，还对一些较年轻的花岗岩进行了TTG返工。由于HREE低，原始地幔归一化的La / Yb比值较高，Eu异常不显着以及Y的耗竭和Sr的富集，较旧的变形严重的Plutons与Archean TTG套件比较好。较年轻的侵入性花岗岩表现出弱的正Eu异常（Eu / Eu *〜1.3–1.7）和强正Y异常。地球化学歧视（例如 Rb vs Y + Nb）建议与火山弧花岗岩进行比较，这也受到LILE（K，Rb和Ba）和LREE的富集以及HREE和HFSE相对耗竭的支持。但是，BGB和毗邻的花岗岩类云母的结构几何特征，与科马铁矿的结合，缺乏俯冲楔形衍生的典型特征以及BGB镁铁质火山岩的来源不均一性，都表明地幔柱活动以及局部浅层俯冲或过渡构造条件下的地下沉积。