Bundelkhand Craton is an important Archaean cratonic nuclei of the Central Indian Shield and comprises two greenstone complexes, i.e., the Babina–Mauranipur Greenstone Belt and the Girar–Madawara Greenstone Belt. The E–W trending Babina–Mauranipur Greenstone Belt in the central part of the craton, encloses several isolated lensoid shaped ultramafic bodies which has suffered various degrees of alteration and metamorphism. As per modal mineral analysis, the ultramafic rocks of the Babina–Prithvipur section belong to harzburgite and also contain high-Al chromian spinel along with olivine, ortho-pyroxene and amphibole. Mineral chemistry reveals that the spinels are of high Al and Cr poor variety, where Al₂O₃ and Cr₂O₃ contents range from 40.06 to 54.34 wt.% and 9.05 to 14.89 wt.%, respectively. The TiO₂ content is extremely low (average ≈0.07 wt.%). The Cr# value of the spinel is <0.2, whereas Mg# ranges from 0.495 to 0.633. The forsterite contents of the olivine ranges from 86.088 to 88.105 wt.%. Average CaO and NiO contents of the olivine stand 0.03 and 0.24 wt.%, respectively. Composition of the analyzed ortho-pyroxene belongs to En_{84.20–87.75}Wo_0.15–0.39 with low CaO content of 0.080 to 0.207 wt.%. As per mineral chemistry, these harzburgite rocks of the Babina–Prithvipur section belong to mantle peridotite. Melt calculation for the spinel also suggests a least differentiated magmatic product, which is also supported by the olivine spinel mantle array diagram as all the samples are plotted within the mantle array field very close to the fertile mantle source. Low TiO₂ and high Al contents of spinel also reflect the MORB type peridotite characteristics for these ultramafic rocks which probably originated from least differentiated plagioclase free mantle derived harzburgite/lherzolitic magma in a rift related spreading centre. As a whole these ultramafic rocks appear to be the remnant of the early crust that existed during the Archaean time.

中文翻译：

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印度中部邦德汉德·克拉顿的巴比那一普里特普尔普岩样超镁铁质岩中高铝铬尖晶石的矿物化学：对成岩作用和构造环境的影响

Bundelkhand Craton是中印度盾的重要的古生界克拉通核，由两个绿岩复合体组成，即Babina-Mauranipur绿岩带和Girar-Madawara绿岩带。克拉通中部E-W趋势的Babina-Mauranipur绿岩带围绕着几个孤立的类透镜状超镁铁质岩体，它们经历了不同程度的变质和变质作用。根据模态矿物分析，Babina–Prithvipur断面的超镁铁质岩石属于哈兹伯格岩，还含有高铝铬尖晶石以及橄榄石，邻辉石和闪石。矿物化学表明，尖晶石具有高Al和Cr贫乏品种，其中Al ₂ O ₃和Cr ₂ O ₃含量分别为40.06至54.34重量％和9.05至14.89重量％。TiO ₂含量极低（平均≈0.07 wt。％）。尖晶石的Cr＃值＜0.2，而Mg＃的范围为0.495至0.633。橄榄石中的镁橄榄石含量为86.088至88.105重量％。橄榄石的平均CaO和NiO含量分别为0.03和0.24 wt。％。被分析的邻-邻_{二甲苯的成分}属于En _{84.20–87.75} Wo _0.15–0.39CaO含量低至0.080至0.207 wt。％。根据矿物化学，巴比纳-普里特维布尔部分的这些哈兹伯格岩属于地幔橄榄岩。尖晶石的熔体计算还表明了微分的岩浆积，橄榄石尖晶石地幔阵列图也支持这一点，因为所有样品都在非常靠近肥沃地幔源的地幔阵列场内绘制。尖晶石的低TiO ₂和高Al含量也反映了这些超镁铁质岩石的MORB型橄榄岩特征，这些特征可能源自与裂谷有关的扩散中心中分化最少的无斜长石的地幔衍生的哈兹伯格岩/锂沸石岩浆。总体而言，这些超镁铁质岩石似乎是古生代时期存在的早期地壳的残留物。