The western margin of the north Delhi fold belt, Rajasthan is mostly covered by the thick alluvium‐sand cover of the Thar Desert. However, a study on a cluster of scattered and deformed serpentinite bodies exposed in the small opencast quarries are presented here. Though alteration and absence of primary phases possess constraints over petrogenesis, but, the accessory, anhedral spinel chemistry aids in the genetic reconstruction. The unaltered core part of the spinel that is, the Al‐chromite (avg. 45.2 wt% Cr₂O₃), followed by ferrit chromite (avg. 32.3 wt% Cr₂O₃) inner rim and magnetite towards the outer rim is the character of spinels present in the host, where the chemistry of the core part is used exclusively. This core part of spinel preserves the primary mantle signature and attests the forearc peridotite character and a similar subduction‐related trait is followed by the whole‐rock major oxide proxies. Cumulative petrological, whole‐rock geochemistry, and mineral chemical signature unequivocally advocate towards a harzburgitic protolith, an arc peridotitic character, and presence of ancient forearc environment. The present communication is the first to describe the detailed characterization of serpentinite bodies with a possible linkage towards the presence of ancient oceanic slices in the north Delhi fold belt, Rajasthan, NW India.

中文翻译：

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拉贾斯坦邦北德里褶皱带蛇纹岩的尖晶石化学和地球化学：约束西北印度盾构的岩石成因和地球动力学

拉贾斯坦邦是北德里折叠带的西缘，大部分被塔尔沙漠厚厚的冲积沙覆盖。但是，这里介绍了对暴露在小型露天采石场中的一组分散且变形的蛇纹岩体的研究。尽管初级相的改变和缺失对成岩作用有限制，但是，辅助的，无规的尖晶石化学有助于遗传重建。尖晶石的未改变核心部分，即铝铬铁矿（平均含量为45.2 wt％Cr ₂ O ₃），其次是铁素体铬铁矿（平均含量为32.3 wt％Cr ₂ O _3））内缘和朝向外缘的磁铁矿是主体中存在的尖晶石的特征，其中核心部分的化学成分专门使用。尖晶石的核心部分保留了主要的地幔特征，并证明了前臂橄榄岩的特征，并且具有与俯冲有关的类似特征，其后是全岩石主要氧化物代用品。累积的岩石学，全岩石地球化学和矿物化学特征明确地提倡形成哈氏形的原生石，弧形的橄榄岩质特征和古老的前臂环境。本交流是第一个描述蛇纹岩体的详细特征，并可能与印度西北部印度拉贾斯坦邦北部新德里褶皱带古海洋切片的存在联系起来。