Occurrence of Phlogopite in Carbonatite and Associated Alkaline Rocks at Beldih, Purulia District, West Bengal, India.
Journal Title: International Journal of Engineering and Science Invention - Year 2018, Vol 7, Issue 4
Abstract
Beldih Apatite-Magnetite Mine, Situated In The South Purulia Shear Zone Is Characterised By Alkali Pyroxenite Associated With Carbonatites And Intruded Within Phyllites And Schists Of The Proterozoic Singhbhum Group Of Rocks. Mineralogically Alkali Pyroxenite Is Composed Of Augite, Aegirine Augite, Amphiboles, Phlogopitic Biotite, Calcite And Apatite As Major Constituents With Minor Amounts Of Opaque Minerals Whereas Carbonatite Is Composed Of Calcite Grains With Subordinate Amounts Of Apatite, Phlogopite, Tetra-Ferriphlogopite, Magnetite And Ilmenite. These Rocks Contain Appreciable Amounts Of Phlogopites With Sio2 Ranging From 33.08-40.18 Wt%, Al2o3 From 6.84-11.41 Wt% , Feo(Total) From 5.42-16.30 Wt%, Mgo From 14.34-21.38 Wt%, K2o From 8.36-10.14 Wt%, Na2o From 0.04-0.20 Wt%, Cao From 0.02- 0.08 Wt%, Tio2 From 0.01-0.07 Wt%, Whereas Mno, Bao And Cr2o3 Are Negligible. . The Occurrence Of These Minerals Are Considered To Be A Result Of Alkali Metasomatism (Or Phlogopitisation) Induced By The Alkali Rich Carbonatite Magma During The Process Of Its Crystallisation And Emplacement Within The Host Rocks.
Authors and Affiliations
Melvin A. Ekka, Jugnu Prasad, D. K. Bhattacharya
Keywords
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