The Lower Vindhyan (Semri) Group substantially consists of unmetamorphosed and undeformed sedimentary sequences of Palaeoproterozoic age. A detailed geochemical study has been carried out to infer the paleoenvironment and the source of REEs for the Palaeoproterozoic Kajrahat Limestone, Vindhyan Supergroup, Central India. This study investigates the geochemical composition of major, trace and rare earth elements (REEs). The studied limestones, have a high percentage of CaO (ranging from 30.87 to 48.59) implies that calcite was the primary mineral phase in these carbonates. SiO₂ is second most abundant major oxide. Sr is dominant trace element showing a negative correlation with CaO. All trace elements exhibit depletion with respect to Post-Archean Australian Shale (PAAS). The PAAS-normalized REE pattern of studied limestone has a relatively uniform pattern, with slightly enriched LREE compared to HREE with negative Ce anomaly. Collectively, low concentration of U and U/Th, Ce/Ce* ratios clearly indicates an oxic depositional condition for the samples. The ΣREE shows a positive correlation with SiO₂, TiO₂ and Al₂O₃ (r² = 0.87, 0.84and 0.91 respectively) and a week positive correlation with CaO (r² = 0.12) suggested that siliciclastic sediments also serve as a source for the REEs beside seawater. This, in turn, indicates that the deposition of this limestone occurred in a coastal/shallow marine environment with some contribution from continental part.

下温迪亚 (Semri) 群主要由古元古代未变质和未变形的沉积层序组成。为了推断印度中部 Vindhyan 超群古元古代 Kajrahat 灰岩的古环境和稀土元素来源，进行了详细的地球化学研究。本研究调查了主量、微量和稀土元素 (REE) 的地球化学成分。研究的石灰石具有高比例的 CaO（范围为 30.87 至 48.59），这意味着方解石是这些碳酸盐中的主要矿物相。SiO ₂是第二丰富的主要氧化物。Sr 是主要微量元素，与 CaO 呈负相关。太古宙后澳大利亚页岩 (PAAS) 的所有微量元素均呈现耗尽状态。研究的石灰岩的 PAAS 归一化 REE 模式具有相对均匀的模式，与具有负 Ce 异常的 HREE 相比，轻稀土元素略有富集。总的来说，低浓度的 U 和 U/Th、Ce/Ce* 比率清楚地表明样品的氧化沉积条件。ΣREE与SiO ₂、TiO ₂和Al ₂ O ₃呈正相关（r ² 分别为0.87、0.84和0.91），与CaO呈一周正相关（r ²  = 0.12），表明硅质碎屑沉积物也可作为来源。对于海水以外的稀土元素。反过来，这表明该石灰岩的沉积发生在沿海/浅海环境中，其中有大陆部分的贡献。