Current Science

Open Access Open Access  Restricted Access Subscription Access

Magneto-Mineralogical Characterization and Manifestations of Magnetic Fabrics from the Gneissic Rocks and Associated Intrusive Bodies in and around Bankura and Purulia Districts, West Bengal, India


Affiliations
1 Department of Geological Sciences, Jadavpur University, Kolkata 700 032, India
 

The present study aims to unravel the mineralogical, chemical and anisotropy of magnetic susceptibility (AMS) from gneissic rocks and associated pegmatitic bodies from Bankura–Purulia region, West Bengal (India). Petrographic studies were done to detect the textural relationship of minerals that contribute susceptibility with that of the silicates. The study of polished thin-sections under reflected light microscope showed the presence of titano-magnetite and magnetite as dominant magnetic minerals. More than one generation of magnetic minerals were found which are linked to different conditions of temperature and tectonics that prevailed during their oxidation. AMS studies depicted the overall nature of magnetic fabrics (and other related parameters like mean susceptibility, magnetic foliation, magnetic lineation, corrected degree of anisotropy, shape parameter) in the region. The susceptibility ellipsoids were dominantly oblate in the region as evident from the Pj–Tj plots. The absence of linear relationship between mean susceptibility and degrees of anisotropy proves that the fabrics are independent of bulk ferromagnetic susceptibility and controlled by deformational features. The equal area plots of the principal susceptibility axes and representation of maximum susceptibility axes in the rose diagram revealed parity between the field and magnetic fabrics thus pointing to a tectonic control of fabrics. Moreover, the pegmatitic bodies based on AMS parameters are found to have emplace syn-tectonic to basement deformation which impinged a linear feature (both in mesoscopic fabric and magnetic fabric) to the otherwise undeformed intrusive bodies.

Keywords

Atomic Absorption Spectrophotometry, Anisotropy of Magnetic Susceptibility, Fe–Ti-Oxide, Gneiss, Pegmatites.
User
Notifications
Font Size

  • Watson, J. V., Vertical movements in Proterozoic structural provinces. Philos. Trans. R. Soc. London A, 1976, 280.

  • Baidya, T. K., Archean metallogeny and crustal evolution in the East Indian shield. Earth Sci. (Special Issue: Archean Metallogeny and Crustal Evolution), 2015, 4/4-1, 1–14.

  • Ghose, N. C., Geology, tectonics and evolution of the Chhotanagpur granite-gneiss complex, Eastern India. In Recent Researches in Geology, Hindustan Pub. (Delhi), 1983, vol. 10, pp. 211–247.

  • Mandal, A., Ray, A., Debnath, M. and Paul, S. P., Petrology, geo-chemistry of hornblende gabbro and associated dolerite dyke of Paharpur, Puruliya, West Bengal: Implication for petrogenetic process and tectonic setting. J. Earth Syst. Sci., 2012, 121(3), 793–812.

  • Baidya, T. K., Chakravarty, P. S., Drubetskoy, E. and Khiltova, V. J., New geochronological data on some granitic phases of the Chhotanagpur granite gneiss complex in the northwestern Purulia district, West Bengal. Indian J. Earth Sci., 1987, 14(2), 136–141.

  • Baidya, T. K., Maity, N. and Biswas, P., Tectonic phases and crustal evolution in a part of the Eastern Chhotanagpur Gneissic Complex. J. Geol. Soc. India, 1987, 34(3), 318–324.

  • Sengupta, D. K. and Sarkar, S. N., Structure of the granitic rock and associated metamorphites of the area around Muri-Silli-Jhalida, Ranchi and Purulia Districts, India. In 22nd International Geological Congress, 1964, vol. 4, pp. 374–389.

  • Ghosh, N. C., Geology, tectonic evolution of the Chhotanagpur granite gneiss complex, eastern India. Recent Res. Geol., 1983, 10, 211–247.

  • Mazumder, S. K., Crustal evolution of Chhotanagpur gneissic complex and the Mica Belt of Bihar. In Precambrian of the Eastern Indian Shield. Geological Society of India Memoir, 1988, vol. 8, pp. 49–83.

  • Sarkar, A. N., Tectonic evolution of the Chhotanagpur plateau and Gondwana basins in eastern India: An interpretation based on supra-subduction geological processes. In Precambrian of the Eastern Indian Shield. Geological Society of India Memoir, 1988, vol. 8, pp. 127–146.

  • Tarling, D. and Hrouda, F., Magnetic Anisotropy of Rocks, Springer, 1993, pp. 14–27.

  • Sen, K., Sharma, R. and Arora, B. R., Influence of magnetic fabric anisotropy on seismic wave velocity in paramagnetic granites from NW Himalaya: Results from preliminary investigations. J. Geol. Soc. India, 2010, 76/4, 322–330.

  • Jayangondaperuma, R., Dubey, A. K. and Sen, K., Structural and magnetic fabric studies of recess structures in the western Himalaya: Implications for 1905 Kangra earthquake. J. Geol. Soc. India, 2010, 75/1, 225–238.

  • Nagata, T., Rock magnetism. In Maruzen, 1961, 2nd edn, p. 350.

  • Blasley, J. R. and Buddington, A. F., Magnetic susceptibility anisotropy and fabric of some Adirondack granites and orthogenesis. Am. J. Sci., 1960, 258/A, 6–20.

  • Stacey, F. D., Joplin, G. and Lindsay, J., Magnetic anisotropy and fabric of some foliated rocks from S.E. Australia. Geophys. Pura Appl., 1960, 47, 30–40.

  • Hrouda, F., Chlupacova, M. and Relj, L., The mimetic fabric of magnetite in some foliated granitoids, as indicated by magnetic anisotropy. Earth Planet. Sci. Lett., 1971, 11, 4–38.

  • Hrouda, F., Janak, F., Rejl, L. and Weiss, J., The use of magnetic susceptibility anisotropy for estimating the ferromagnetic mineral fabrics of metamorphic rocks. Geol. Rundsh., 1971, 60, 42–1124.

  • Jelenik, V., Characterization of the magnetic fabric of rocks. Tectonophysics, 1973, 79, 7–63.

  • Hrouda, F., Magnetic anisotropy of rocks and its application in Geology and Geophysics. Geophys. Surveys, 1982, 5, 37–82.

  • Flinn, D., On folding during three-dimensional progressive deformation. Q. J. Geol. Soc. London, 1962, 118, 385–433.

  • Haggerty, S. E., Opaque mineral oxides in terrestrial igneous rocks. In Oxide Minerals (ed. Rumble, D.), Mineral. Soc. Am., Short Course Notes, 3, Hg101–Hg300.

  • Chatterjee, S., Gain, D. and Mondal, S., Magneto-mineralogy characterization and analysis of magnetic fabrics of the high-grade rocks from Chilka Lake area, Eastern Ghats belt, India. Earth Sci. India, 2016, 9/1, 29–47.

  • Johnson, H. P. and Hall, J. M., A detailed rock magnetic and opaque mineralogy study of the basalts from Nazca Plate. Geo-phys. J. R. Astr. Soc., 1978, 52, 45–64.

  • Prevot, M., Remond, G. and Caye, R., Etude de la transformation d’unetitano magnetite-en-titanomaghemite-dansunerochevolcanique. Bull. Soc. Fr. Min. Cristallogr., 1968, 91, 65.

  • Akimoto, T., Kinoshita, H. and Furuta, T., Electron probe micro-analysis study on process of Low temperature oxidation of titano-magnetite. Earth Planet. Sci. Lett., 1984, 71, 263–278.

  • Ferre, E. C., Martin-Hernandez, F., Teyssier, C. and Jackson, M., Paramagnetic and ferromagnetic anisotropy of magnetic susceptibility in migmatites: measurements in high and low fields and kinematic implications. Geophys. J. Int., 2004, 157, 1119–1129.

  • Rathore, J. S., Magnetic susceptibility anisotropy in the Cambrian slate belt of North Wales and correlation with strain. Tectonophysics, 1979, 53, 83–97.

  • Goldstein, A. G., Magnetic susceptibility anisotropy of mylonites from the Lake Char Mylonite Zone, SE New England. Tectono-physics, 1980, 66, 197–211.

  • Mondal, S., Piper, J. D. A., Hunt, L., Bandopadhyay, G. and BasuMallick, S., Palaeomagnetic and rock magnetic study of charnockites from Tamil Nadu, India, and the ‘Ur’protocontinent in Early Palaeoproterozoic times. J. Asian Earth Sci., 2009, 34, 493–506.

  • Hrouda, F. and Janak, F., The changes in shape of the magnetic susceptibility ellipsoid during progressive metamorphism and deformation. Tectonophysics, 1976, 4, 135–148.

  • Zhang, J. and Piper, J. D. A., Magnetic fabric and post-orogenic uplift and cooling magentisations in a Precambrian granulite terrain: The Datong-Huai’an region of the North China Shield. Tectonophysics, 1994, 234, 227–246.


Abstract Views: 275

PDF Views: 96




  • Magneto-Mineralogical Characterization and Manifestations of Magnetic Fabrics from the Gneissic Rocks and Associated Intrusive Bodies in and around Bankura and Purulia Districts, West Bengal, India

Abstract Views: 275  |  PDF Views: 96

Authors

Saurodeep Chatterjee
Department of Geological Sciences, Jadavpur University, Kolkata 700 032, India
Supriya Mondal
Department of Geological Sciences, Jadavpur University, Kolkata 700 032, India
Pratik Roy
Department of Geological Sciences, Jadavpur University, Kolkata 700 032, India
Debesh Gain
Department of Geological Sciences, Jadavpur University, Kolkata 700 032, India
Amitava Bhattacharya
Department of Geological Sciences, Jadavpur University, Kolkata 700 032, India

Abstract


The present study aims to unravel the mineralogical, chemical and anisotropy of magnetic susceptibility (AMS) from gneissic rocks and associated pegmatitic bodies from Bankura–Purulia region, West Bengal (India). Petrographic studies were done to detect the textural relationship of minerals that contribute susceptibility with that of the silicates. The study of polished thin-sections under reflected light microscope showed the presence of titano-magnetite and magnetite as dominant magnetic minerals. More than one generation of magnetic minerals were found which are linked to different conditions of temperature and tectonics that prevailed during their oxidation. AMS studies depicted the overall nature of magnetic fabrics (and other related parameters like mean susceptibility, magnetic foliation, magnetic lineation, corrected degree of anisotropy, shape parameter) in the region. The susceptibility ellipsoids were dominantly oblate in the region as evident from the Pj–Tj plots. The absence of linear relationship between mean susceptibility and degrees of anisotropy proves that the fabrics are independent of bulk ferromagnetic susceptibility and controlled by deformational features. The equal area plots of the principal susceptibility axes and representation of maximum susceptibility axes in the rose diagram revealed parity between the field and magnetic fabrics thus pointing to a tectonic control of fabrics. Moreover, the pegmatitic bodies based on AMS parameters are found to have emplace syn-tectonic to basement deformation which impinged a linear feature (both in mesoscopic fabric and magnetic fabric) to the otherwise undeformed intrusive bodies.

Keywords


Atomic Absorption Spectrophotometry, Anisotropy of Magnetic Susceptibility, Fe–Ti-Oxide, Gneiss, Pegmatites.

References





DOI: https://doi.org/10.18520/cs%2Fv114%2Fi09%2F1894-1902