• Petrographic analysis of Krem (cave) Mawmluh stalagmite from Meghalaya, northeast India

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      https://www.ias.ac.in/article/fulltext/jess/130/0207

    • Keywords

       

      Krem Mawmluh; stalagmite; mineralogical fabrics; biogenic remains.

    • Abstract

       

      In the northeastern states of India, an in-cave expedition to Krem (cave) Mawmluh in Meghalaya has been carried out to document and study the stalagmite sample KM-24. The architectural structure is well preserved with alternating lamina/band of mixed calcite (C) and/or aragonite (A) possibly dueto their polymorphic relationship as CaCO$_3$ primarily precipitated as aragonite and later transformed into calcite due to neomorphism through time. Evidence in support of neomorphic processes have been deciphered through mineralogical fabrics (unstable polymorph to stable polymorph), intercrystalline voids in coalescence aragonite needle-like fabrics, sparite crystallite calcite in voids, Bne micrite (M) within fabrics and growth breach (time gap). The variation in laminae thickness (BMLP) and major oxides (CaO and MgO wt.%) along the growth laminae may be associated with CaCO$_3$ deposition, reCecting surface precipitation and disequilibrium conditions. Preserved biogenic remains(pink–red colour, Blament or thread like-structures) within mineralogical fabrics, intercrystalline voids and outer laminae (A) may depict biogenic activity which might have facilitated precipitation of CaCO$_3$.

    • Author Affiliations

       

      DILDI1 NAGENDRA PANDEY

      1. Department of Earth Science, Aryabhatta School of Earth Sciences, Assam University, Silchar 788 011, India.
    • Dates

       
  • Journal of Earth System Science | News

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