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Petro-Mineralogical and Geochemical Evaluation of Glauconitic Rocks of the Ukra Member (Bhuj Formation), Kutch Basin, India
Clays and Clay Minerals ( IF 2.2 ) Pub Date : 2022-03-09 , DOI: 10.1007/s42860-021-00171-4
Saurabh Shekhar , V. Kumari , S. Sinha , D. Mishra , A. Agrawal , K. K. Sahu

Glauconites occurring within the Ukra Member of Kutch Basin have remained unexplored in terms of their economic significance. The present study aimed to present a detailed physicochemical characterization of glauconite occurring in the siliciclastic rocks of Guneri and Umarsar area of the Kutch district, Gujarat, India to explore their economic potential. The study involved an integrated petrographical, mineralogical, and geochemical investigation of glauconitic rocks to highlight the occurrence, nature, and maturity of glauconite. The characterization was carried out using X-ray diffraction (XRD), X-ray fluorescence (XRF), and electron probe microanalysis (EPMA) combined with energy dispersive X-ray (EDX), Field emission gun scanning electron microscopy (FEG-SEM), Fourier-transform infrared spectroscopy (FTIR), and inductively coupled plasma mass spectroscopy (ICP-MS). Petrographic and bulk XRD analysis revealed that the glauconite occurs as green pellets constituting ~30 and 40% of the glauconitic sandstone and shale, respectively. Whole-rock analysis showed that the value of K2O varies considerably from 3.93 wt.% (sandstone) to 5.63 wt.% (shale). Mineral chemistry indicated the distinctive chemical composition of glauconite pellets containing 7.4–8.4 wt.% of K2O. The parameters, such as the distance between the (001) and (020) peaks and the large K2O content (~8 wt.%) of the glauconite fraction reflect an evolved to highly evolved stage of maturation. The morphological and spectral signatures further support the high degree of maturation in glauconites. Trace-element analysis implied that the glauconitic sandstone and shale contain elements such as Zn, Mn, Cu, Co, Mo, and Ni, which serve as essential micronutrients for plants. These data sets collectively constitute part of a preliminary study which is prerequisite to beneficiation, but further evaluation of its potential as a potash fertilizer also is needed.



中文翻译:

印度 Kutch 盆地 Ukra 段(Bhuj 组)海绿石岩石的石油矿物学和地球化学评价

Kutch 盆地 Ukra 段内的海绿石就其经济意义而言仍未被探索。本研究旨在详细介绍印度古吉拉特邦库奇区 Guneri 和 Umarsar 地区硅质碎屑岩中海绿石的物理化学特征,以探索其经济潜力。该研究涉及对海绿石岩石进行综合的岩石学、矿物学和地球化学调查,以突出海绿石的产状、性质和成熟度。使用 X 射线衍射 (XRD)、X 射线荧光 (XRF) 和电子探针显微分析 (EPMA) 结合能量色散 X 射线 (EDX)、场发射枪扫描电子显微镜 (FEG-SEM) 进行表征), 傅里叶变换红外光谱 (FTIR), 和电感耦合等离子体质谱(ICP-MS)。岩相和整体 XRD 分析表明,海绿石以绿色球团的形式出现,分别占海绿石砂岩和页岩的 30% 和 40%。全岩分析表明,K 值2 O 从 3.93 wt.%(砂岩)到 5.63 wt.%(页岩)变化很大。矿物化学表明含有 7.4-8.4 wt.% K 2 O 的海绿石球团具有独特的化学成分。参数,例如 (001) 和 (020) 峰之间的距离以及大 K 2海绿石部分的 O 含量 (~8 wt.%) 反映了成熟的进化到高度进化的阶段。形态和光谱特征进一步支持海绿石的高度成熟。微量元素分析表明,海绿石砂岩和页岩中含有锌、锰、铜、钴、钼和镍等元素,是植物必需的微量元素。这些数据集共同构成了初步研究的一部分,这是选矿的先决条件,但还需要进一步评估其作为钾肥的潜力。

更新日期:2022-03-09
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