Framboidal — colloform — recrystallised pyrite in the granitoids of Wahkyn area,West Khasi hills,Meghalaya |
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| Authors: | N Ranganath Ashok Kumar Padhi Ajoy Kumar Padhi Ashwini Kumar Rai |
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| Institution: | (1) Plant Genomics laboratory, Medicinal Aromatic and Economic Plants (MAEP) Division, North-East Institute of Science and Technology (NEIST)-Jorhat (Formerly RRL), Jorhat, Assam, 785006, India |
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| Abstract: | Petrographic studies of Proterozoic pyriteferous granitoids forming basement for upper cretaceous Mahadek sediments from Wahkyn
area reveal interesting textural peculiarities of Pyrite. These pyrites also reveal interesting structural peculiarities.
The three textural pyrite varieties found in the granitoids are: framboidal, colloform and recrystallised which appear both
as composite aggregate as well as independent units. Various textures and variation in reflectivity, microhardness and elemental
distribution of the pyrites are described. Average Co/Ni ratio along with the textural manifestation of these pyrites attests
their sedimentary origin. |
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