The Mangalwar Complex of the Aravalli craton is marked by the presence of late Paleoproterozoic granites referred to as Anjana Granite and Amet Granite. These granites occur as 1.64 Ga old plutons intruding greenstone sequences and migmatitic gneisses of Mangalwar Complex which comprises parts of BGC of the Aravalli craton. In the present contribution major, trace and REE data of these granites along with associated microgranular mafic enclaves (MMEs) are presented and discussed. Geochemically these granites are quartz monzonite, metaluminous, sub-alkaline and high-K calc-alkaline rocks. The most important characteristics of Anjana and Amet granites are low SiO₂, high MgO, Mg#, K₂O, Ba, and low Na₂O/K₂O ratios. In addition, the REEs show moderate to high fractionation, with (La/Yb) ratios up to 22 and 23 of the Anjana and Amet granites respectively, with no or positive europium anomalies. In the primitive mantle-normalized trace element diagrams both granites show depletion in high-field strength elements (HFSE) such as Nb, Ta, P, Ti and enrichment in LILEs. Most of these features are comparable to those of sanukitoid series rocks. Geochemically both granites are distinguished as high-Ti sanukitoids. Geochemical characteristics of MMEs suggest that they are similar to Anjana and Amet granites and in turn to sanukitoids with lower SiO₂ content. They display LREE enriched patterns with low values (avg. 13) of (La/Yb)_N, negative Eu anomalies and high HREE contents (58 ppm). It is suggested that the parental magma of Anjana and Amet granitic plutons originated through a four stage process (1) Generation of magmatic melts produced by partial melting of terrigeneous sediments of subducting slab in an arc setting; (2) interaction of those melts with the overlying mantle wedge, and total consumption of slab-derived melts during the reaction resulting in production of a metasomatized mantle; (3) tectonothermal event, possibly related to the slab break-off, causing asthenospheric mantle upwelling. This may have induced the melting of the metasomatized mantle and the generation of sanukitoid magmas. The parental magmas of Anjana and Amet granites and their mafic enclaves were generated at lower and higher lithospheric levels respectively (4) Granitic magma ascended due to viscosity and gravity instabilities and interacted with enclave magma at higher mantle level. Both magmas ascended towards upper crust and evolved through fractional crystallisation. Existing data suggest that in the Mangalwar Complex, the formation of sanukitoid magma started even during Mesoarchaean times and continued till late Paleoproterozoic. Formation of sanukitoid magma during this time indicates that in northern Indian shield the multi-stage subduction- accretionary orogenic processes continued for a protracted geological period and played a major role in the origin and evolution of early continental crust.

Aravalli 克拉通的 Mangalwar 杂岩以晚古元古代花岗岩的存在为标志，称为 Anjana 花岗岩和 Amet 花岗岩。这些花岗岩以 1.64 Ga 古老岩体的形式出现，侵入绿岩序列和 Mangalwar 杂岩体的混合片麻岩，其中包含 Aravalli 克拉通 BGC 的一部分。在目前的主要贡献中，介绍并讨论了这些花岗岩以及相关微颗粒基性飞地 (MME) 的痕量和 REE 数据。从地球化学上讲，这些花岗岩是石英二长岩、金属铝质、亚碱性和高钾钙碱性岩石。Anjana 和 Amet 花岗岩最重要的特征是低 SiO ₂、高 MgO、Mg#、K ₂ O、Ba 和低 Na ₂ O/K ₂比率。此外，稀土元素显示出中度到高度的分馏，Anjana 和 Amet 花岗岩的 (La/Yb) 比分别高达 22 和 23，没有或正铕异常。在原始地幔归一化微量元素图中，两种花岗岩都显示出 Nb、Ta、P、Ti 等高场强元素 (HFSE) 的消耗和 LILE 的富集。这些特征中的大部分与 sanukitoid 系列岩石的特征相当。在地球化学上，这两种花岗岩都被区分为高钛 sanukitoids。MMEs 的地球化学特征表明它们类似于 Anjana 和 Amet 花岗岩，反过来又类似于 SiO ₂含量较低的 sanukitoids 。它们显示 (La/Yb) _{N 的}低值（平均 13）的 LREE 富集模式_，负 Eu 异常和高 HREE 含量 (58 ppm)。认为Anjana和Amet花岗质岩体的母岩浆起源于四个阶段：(1)弧形环境下俯冲板片陆源沉积物部分熔融产生岩浆熔体；(2) 这些熔体与上覆地幔楔的相互作用，以及在导致交代地幔产生的反应过程中板坯衍生熔体的总消耗；(3) 构造热事件，可能与板块断裂引起软流圈地幔上涌有关。这可能导致交代地幔的熔化和sanukitoid岩浆的产生。Anjana 和 Amet 花岗岩的母岩浆及其基性飞地分别产生于较低和较高的岩石圈水平 (4) 花岗岩岩浆由于粘性和重力不稳定性而上升，并与较高地幔层的飞地岩浆相互作用。两种岩浆都上升到上地壳并通过分步结晶演化。现有资料表明，在 Mangalwar 杂岩中，sanukitoid 岩浆的形成甚至在中太古代时期就开始了，并一直持续到古元古代晚期。这一时期的sanukitoid岩浆的形成表明，在北印度地盾中，多阶段俯冲-增生造山过程持续了一个漫长的地质时期，在早期大陆地壳的起源和演化中发挥了重要作用。