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Geochemistry of Precambrian metapelites from Patharkhang, West Khasi Hills district, Meghalaya, India

Author Affiliations

  • 1Department of Geological Sciences, Gauhati University, Guwahati, Assam-781 014, India
  • 2Department of Geology, Dimoria College, Khetri, Kamrup (Metro), Assam-782 403, India
  • 3Department of Geological Sciences, Gauhati University, Guwahati, Assam-781 014, India

Int. Res. J. Earth Sci., Volume 5, Issue (8), Pages 15-21, September,25 (2017)

Abstract

Cordierite bearing and cordierite free garnet sillimanite gneisses constitute granulite facies metapelitic assemblages in the Gneissic Complex rocks of the Shillong Plateau in Patharkhang, West Khasi Hills district in Meghalaya. The petrographic study shows that the mineralogical developments of the metapelites are related to different metamorphic events. However, geochemical affinity of these rocks is totally unknown till date and this study reveals the results of geochemical study of the rocks. The precursors of cordierite bearing metapelites were shales with some volcanic intercalations whose compositions have been possibly modified by partial melting and metamorphic differentiation. The high average K/Rb ratios of the rocks also suggest their restitic origin after the removal of partial melts.

References

  1. Lal M.L., Ackermand D., Seifert F. and Haider S.K. (1978)., Chemographie relationship in sapphirine bearing rocks from Sonapahar, Assam, India., Contrib. Mineral. Petrol, 67(2), 169-187.
  2. Auden J.B. (1974)., Review of “Himalayan Geology”., 2, edited by A.G. Jhingran, K.S. Valdiya and A.K. Jain, Wadia Institute of Himalayan Gelogy, Dehra Dun. J. Geol. Soc. lnd., 15, 216-218.
  3. Murthy M.V.N., Nandy D.R. and Chakravarty C. (1976)., A note to accompany The tectonic map of the North-East India and adjoining areas., Geol. Surv. Ind. Misc. Publ., 23(2), 347-362.
  4. Murthy M.N.V., Mazumdar S.K. and Bhaumik N. (1976)., Significance of tectonic trends in the geological evolution of Meghalaya uplands since the Precambrian., Geol. Surv. India Misc Publ, 23(2), 471-484.
  5. Mazumdar S.K. (1976)., A summary of the Precambrian Geology of the Khasi Hills, Meghalaya., Geol, Surv, Ind. Mtsc. Publ., 23(2), 311-334.
  6. Singh S. (2007)., Petrology of the granulite facies rocks with special reference to the basic granulites around Patharkhang in west Khasi hills district, Meghalaya., (Unpublished Ph.D. thesis), Gauhati University.
  7. Crawford A.R. (1969)., India, Ceylon and Pakistan: New age data and comparison with Australia., Nature, 223, 380-384.
  8. Van Breeman O., Bowes D.R., Bhattacharjee C.C. and Chowdhary P.K. (1989)., Late Proterozoic – Early Proterozoic Rb-Sr whole rock and mineral ages for granite and pegmatite, Goalpara, Assam, India., J. Geol. Soc. Ind., 34(1), 89-92.
  9. Ghosh S., Chakraborty S., Bhalla J.K., Paul D.K., Sarkar A. Bishui P.K. and Gupta S.N. (1991)., Geochronology and geochemistry of granite plutons from East Khasi Hills, Meghalaya., Jour. Geol. Soc. Ind., 37(4), 331-342.
  10. Chatterjee N., Mazumdar A.C., Bhattacharya A and Saikia R.R. (2007)., Meso-proterozoic granulites of the Shillong – Meghalaya Plateau: evidence of westward continuation of the Prydz Bay Pan – African suture into Northeastern India., Precambrian Res., 152(1), 1-26.
  11. Shaw D.M. (1956)., Geochemistry of pelitic rocks Pt III: Major element and general geochemistry., Bull. Geol.Soc. Am., 67(7), 919-934.
  12. Pettijhon F.J. (1976)., Sedimentary Rocks., 3rd ed. Harper and Row. New York, 628.
  13. Condie K.C., Macke J.E. and Reimer O.T. (1970)., Petrology and geochemistry of early Precambrian greywacke from the Fig Tree Group, South Africa., Geol. Soc. Am. Bull., 81(9), 2759-2776.
  14. Shaw D.M. (1972)., Development of early continental crust Part I. Use of trace elements distribution coefficient models for the Protoarchean crust., Canadian J. Earth Sci., 9(12), 1577-1595.
  15. Wynne-Edwards H.R. and Hay P.W. (1963)., Coexisting cordierite and garnet in regionally metamorphosed rocks from the Westpost Area, Ontario., Can. Miner., 7(3), 453-478.
  16. Sheraton J.W. (1980)., Geochemistry of Precambrian metapelites from East Antarctica: Secular and metamorphic variation., B.M.R.J. Austr. Geol. Geophys., 5, 279-288.
  17. Grant J.A. (1968)., Partial melting of common rocks as a possible source of cordierite-Anthophyllite bearing assemblages., Am. Jour. Sci., 266(10), 908-931.
  18. Hormaan P.K., Raith M., Rasse P., Ackermand D. and Seifert F. (1980)., The granulite complex of Finnish Lapland: Petrology and metamorphic conditions in the Iva Iojoki – Inarijarvi area., Geol. Surv. Findl. Bull., 308, 1-95.
  19. Bhumel P. and Schereyer W. (1977)., Phase relation in pelitic and psammitic gneisses of the sillimanite-potash feldspar and cordierite-potash feldspar zones in the Moldanubicum of the Lam-Bodenmais area, Bavaria., Jour. Petrology, 18(3), 431-459.