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<p>Chemico-mineralogical characterization of glauconitic sandstone suggests the potential of glauconite as a non-conventional source of potassium fertilizer. Potassium is a nutrient essential in agronomic application. Integrated study including remote sensing and airborne geophysical survey-field study-sedimentology-petrography-whole rock and mineral geochemistry of glauconitic sandstones from Precambrian Chandarpur Group, Chhattisgarh basin is employed to assess host rock potential from mineralization point of view. An east-west trending ~ 18&#xa0;km long and ~ 0.35–4.5&#xa0;km wide glauconitic horizon was delineated here. Glauconite percentage shows a formation-controlled variation, where oldest Lohardih Formation preserves a modal proportion of ~ 0.5-4% glauconite, and youngest Kansapathar Formation preserves that of &gt; 20% (maximum upto ~ 25%). Chaporadih Formation, in between shows an intermediate value of ~ 5–12%. Glauconites occur in various sizes and shapes, color vary from pale green in Lohardih Formation indicating ‘nascent variety’ to greenish-black in Kansapathar Formation indicating ‘highly-evolved variety’. Petrographic study shows occurrence of glauconites as discrete peloids-veins &amp; stringers-cement formed through ‘pseudomorphic replacement’ of quartz-feldspar. XRF analysis displays K<sub>2</sub>O values upto ~ 5.84wt% in rock samples and upto ~ 4.11wt% in stream-sediment-soil samples, much higher than UCC value of 2.32wt%. EPMA shows promising K<sub>2</sub>O values, upto ~ 8.43wt%, compared to the maximum K<sub>2</sub>O values in glauconites as &lt; 10wt%. Sedimentological study indicates deposition of basal Lohardih Formation in fan-delta complex during initiation of Chhattisgarh basin by intracratonic rifting of Bastar craton. Sub-aerial environment subsequently changed into sub-aqueous to shallow-marine open-shelf, when glauconitization initiated near sediment-water interface. Glauconite gradually got evolved and percentage increased towards top of Kansapathar Formation. Considering ever-increasing requirement of potash fertilizer in India, which is being fulfilled by trade-in potash only, in absence of any large-scale commercial extraction irrespective of sound potash resources in the country, the reported glauconitic horizon can form an alternate for imported potassium.</p>

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Assessment of Precambrian Glauconitic Sandstones from Chandarpur Group, Chhattisgarh Basin, Central India as an Alternate Potash Fertilizer

  • 期刊论文

  • 发表日期：

    2026年1月27日

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  • Sayani Khan,
  • Mohammad Asif

摘要

Chemico-mineralogical characterization of glauconitic sandstone suggests the potential of glauconite as a non-conventional source of potassium fertilizer. Potassium is a nutrient essential in agronomic application. Integrated study including remote sensing and airborne geophysical survey-field study-sedimentology-petrography-whole rock and mineral geochemistry of glauconitic sandstones from Precambrian Chandarpur Group, Chhattisgarh basin is employed to assess host rock potential from mineralization point of view. An east-west trending ~ 18 km long and ~ 0.35–4.5 km wide glauconitic horizon was delineated here. Glauconite percentage shows a formation-controlled variation, where oldest Lohardih Formation preserves a modal proportion of ~ 0.5-4% glauconite, and youngest Kansapathar Formation preserves that of > 20% (maximum upto ~ 25%). Chaporadih Formation, in between shows an intermediate value of ~ 5–12%. Glauconites occur in various sizes and shapes, color vary from pale green in Lohardih Formation indicating ‘nascent variety’ to greenish-black in Kansapathar Formation indicating ‘highly-evolved variety’. Petrographic study shows occurrence of glauconites as discrete peloids-veins & stringers-cement formed through ‘pseudomorphic replacement’ of quartz-feldspar. XRF analysis displays K2O values upto ~ 5.84wt% in rock samples and upto ~ 4.11wt% in stream-sediment-soil samples, much higher than UCC value of 2.32wt%. EPMA shows promising K2O values, upto ~ 8.43wt%, compared to the maximum K2O values in glauconites as < 10wt%. Sedimentological study indicates deposition of basal Lohardih Formation in fan-delta complex during initiation of Chhattisgarh basin by intracratonic rifting of Bastar craton. Sub-aerial environment subsequently changed into sub-aqueous to shallow-marine open-shelf, when glauconitization initiated near sediment-water interface. Glauconite gradually got evolved and percentage increased towards top of Kansapathar Formation. Considering ever-increasing requirement of potash fertilizer in India, which is being fulfilled by trade-in potash only, in absence of any large-scale commercial extraction irrespective of sound potash resources in the country, the reported glauconitic horizon can form an alternate for imported potassium.