Mica bearing pegmatites of Holenarasipura and Karighatta Schist belts of Western Dharwar Craton, Karnataka, India.

G. S. Somesha¹ , Govindaraju ² , M. Vinaya³ , S. Govindaiah⁴

Section:Research Paper, Product Type: Isroset-Journal
Vol.7 , Issue.2 , pp.108-117, Apr-2019

CrossRef-DOI:   https://doi.org/10.26438/ijsrpas/v7i2.108117

Online published on Apr 30, 2019

Copyright © G. S. Somesha, Govindaraju, M. Vinaya , S. Govindaiah . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

View this paper at   Google Scholar | DPI Digital Library

XML View     PDF Download

How to Cite this Paper

368 Views    157 Downloads    65 Downloads

Abstract :
Several pegmatite bodies of Precambrian age are located in and around the Holenarasipura and Karighatta schist belts of Hassan and Mandya districts respectively in the Dharwar Craton in Karnataka, These are ranging in size from few centimeters to more than 10 meters in width, with a maximum extension of about one kilometer. The pegmatites in the study area are of tabular, lensoidal and lenticular bodies, within the country rocks. Most of the pegmatites are found to be as concordant and few are discordant type of intrusions. Based on the mineralogical assemblage, the pegmatites of the study area are classified into simple and complex pegmatites. The characterization has been made for pegmatites on the basis of their petrographic, modal analysis, X-ray diffraction studies and also by field observation. The modal analysis has shown that the pegmatites fall mainly in the field of alkali feldspar granite, granite and granodiorite in QAP diagram with an indication of feldspar-rich composition followed by quartz, muscovite, biotite, garnet, zircon and apatite in decreasing abundance throughout the area.

Key-Words / Index Term :
Pegmatites, Petrography, X-ray diffraction, Modal analysis, Holenarasipura and Karighatta

References :
[1] K.L. Bhola, “Atomic Mineral Deposits in Bihar Mica-Belt”, Proc. Indian Nat. Sci. Acad. 37 A , No. 2, pp. 145-168, 1971.
[2] C. Ramaswamy, M.L. Deshpandc, K.S. Murthy, H.P. Jaiswar, R.S. Jcsani, “Tin-bearing pegmatites of Baslar, M.P”, Geol. Surv. India, Spl. Pub. No. 3, pp.185-189, 1976.
[3] V.J.S. Lamba & V.K. Khanna, “Characteristic features of tin-bearing rare metal pegmatites of Konla Tahsil, Bastar Dist, M.P”, Bull. Indian Geol. Assoc, Vol.14, No.2, pp.151-154, 1981.
[4] P.V.R. Babu, “Tin and rare metal pegmatites of the Bastar - Koraput pegmatite Belt, Madhya Pradesh and Orissa”, India. Jour. Geol. Soc. India,Vol .42, pp.80-90, 1993.
[5] L.G. Gwalani, V.P. Dalal, S. Soledad Fernandez, B.P. Mulai, Shireen Parveen and B.V. Shastry, “Granitic pegmatites of Koradi-Kolar sector, Nagpur District, Central India: Field, Petrographic and Mineralogical features”, Brazilian Journal of Geology, Vol.29, No.1, pp. 99-104, 1999.
[6] D.C. Banerjee, N. Ranganath, P.B. Maithani and K.M.V. Jayaram, “Rare metal bearing pegmatites in parts of southern Karnataka”, India. Jour. Geol. Soc. India, Vol.30, pp. 507-513, 1987.
[7] D.C. Banerjee, K.V.G. Krishna, G.V.G.K. Murthy, S.K. Srivastava, R.P. Sinha, “Occurrence of spodumene in the rare metal bearing pegmatites of Marlagalla-Allapatna area, Mandya district, Karnataka, India”, Jour. Geol. Soc. India, Vol.44, pp.127-139, 1994.
[8] Chanchal Sarbajna, P. Krishnamurthy, “The fertile granite at Allapatna, Mandya district, Karnatka: A possible parent to Rare metal pegmatites of southern Karnataka”, Jour. Geol. Soc. India, Vol. 46, pp. 95-98, 1996.
[9] P.B. Maithani, “Rare-metal pegmatite bodies with recoverable columbite-tantalite from the Arehalli area, Hassan dist, Karnataka”. Explor. Res. Atomic Minerals, Vol.20, pp.1-11, 2010.
[10] Chanchal Sarbajna, P. Krishnamurthy, “Raremetal pegmatites of Marlagalla-Allpatna area, Mandya district, Karnataka: Some aspects on pegmatite zonation and geochemistry of pegmatitic minerals”, Jour. of Atomic Mineral Science, Vol.02, pp.29-43, 1994.
[11] Chanchal Sarbajna, U. K. Pandey, P. Krishnamurthy, “Geochemistry and Petrogenesis of 2.8 Ga Old Rare Metal Bearing Fertile Granite at Allapatna, Mandya District, Karnataka”. Jour. Geol. Soc. India, Vol.91, pp.67-75, 2018.
[12] A.K. Datta, “Internal Structure, Petrology and Mineralogy of calc-alkalinc pegmatites in parts of Rajasthan”, Mem. Geol. Surv. India, Vol.110, pp.1-112, 1973.
[13] V.R. R.M. Babu, “Temperature of Formation of pegmatites of Nellore Mica Belt, A.P, India”, Econ.Geol, Vol.64, pp.66-71, 1969.
[14] K. Soman, N. G. K. Nair, A. V. Druzhinin, "Chrysoberyl pegmatites of South Kerala and their metallogenic implications", Journal of the Geological Society of India, Vol.27, No.5, pp. 411-418, 1986.
[15] Y. Singh, D.S. Sharma, “Geology of Tantalitc pegmatite from Belangi, Surguja District, Madhya Pradesh, India”, Jour. Geol. Soc. India, Vol.49, pp.427-432, 1997.
[16] I. Parson, “Alkali feldspar and Fe-Tin oxide exsolution textures as indicators of the distribution and subsolidus effects of magmatic “water” in the Klokken layered syenite intrusion, South Greenland”, Transactions Research Society, Edinburgh. Earth Science, Vol.71, pp.1-12, 1980.
[17] R. A. Yund, D. Ackermand, “Development of perthite microstructures in the Storm King granite, N.Y”, Contributions to Mineralogy and Petrology, Vol.70, No.3, pp.273–280, 1979.
[18] A.L. Streckeisen, “Plutonic Rocks: Classification and Nomenclature Recommended by the I.U.G.S. Sub-Commission on the Systematic of Igneous Rocks”, Geo, Times, Vol.18, pp.26-30, 1973.
[19] G E. Harlow, “The anorthoclase structures: The effects of temperature and composition”, American Mineralogist, Vol.67, pp. 975-996, 1982.
[20] A. Blasi, C. De Pol Blasi, P.F. Zanazzi, “A re-examination of the Pellotsalo microcline: Mineralogical implications and genetic considerations”, The Canadian Mineralogist, Vol.25, pp. 527-537, 1987.