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Rb-Sr and Oxygen Isotope Study of the Swat Granite Gneisses (Pakistan): Implications for the Magmatic Source and Tectonic Setup

  • Tahseenullah KhanEmail author
  • Abid Ahmad
  • Hafiz Ur Rehman
  • Muhammad Nawaz Chaudhry
  • Mamoru Murata
  • Muhammad Zafar
Chapter
Part of the Advances in Science, Technology & Innovation book series (ASTI)

Abstract

A wide range of granite bodies are lying in the Pakistani Himalaya along the northern leading edge of the Indian plate in the Swat area of Pakistan. Several such bodies are collectively designated here as Swat granite gneisses. The latter are exposed mainly across the Chakdarra, Ilam-Karakar and Saidu-Parona areas. Lens-shaped K-feldspar augens in a groundmass of quartz, feldspar and biotite characterize these bodies. Garnet, epidote, titanite, zircon and opaque minerals are also noticed to persist in minor amounts in the form of prevailing accessories. Both quartz and feldspar appear to display extreme stretching parallel to the predominant foliation due to shearing. On the basis of Rb-Sr geochronology and oxygen isotope composition, the granite gneiss at Chakdarra yields Rb-Sr whole-rock isochron age of 213 ± 24 Ma. As for the Ilam-Karaker and Saidu-Parona areas, the granite gneisses respectively display age ranges of 260 ± 52 Ma and 285 ± 8 Ma. The δ18O values determined in the Chakdarra, Ilam-Karakar and Saidu-Parona based granite gneisses range from +8.8 to +9.2‰, and +8.6 to +9.4‰ and +9.0 to +9.5‰, respectively. On the basis of mineral assemblages, theses granites seem to be of an S-type. Noteworthy, however, is that the Swat granite gneisses, which contain less than 10‰ of δ18O values, prove to be of the I-type granites. Their peraluminous signatures seem to be due to fractional crystallization process. Our newly obtained age data indicate Permian magmatic activity that belongs to the early rifting of the Cimmerian micro-continent from Gondwana.

Keywords

Granite gneisses Swat Geochronology Petrogenesis Tectonic setting 

References

  1. 1.
    Ahmad, I., Jan, M.Q., DiPietro, J.A.: Age and tectonic implications of granitoid rocks from the Indian plate of Northern Pakistan. J. Virt. Explorer, Electronic Edition 11(2) (2003)Google Scholar
  2. 2.
    Le Fort, P., Debon, F., Sonet, J.: The ‘Lesser Himalayan’ cordierite granite belt. Typology and age of the pluton of Mansehra (Pakistan). In: Tahirkheli, R.A.K., Jan, M.Q., Majid, M. (eds.) Proceedings of the International Committee on Geodynamics, Group 6 Meeting at Peshawar 1980, Special issue vol. 13, pp. 51–61, Geol. Bull. Univ. Peshawar (1980)Google Scholar
  3. 3.
    Le Fort, P., Debon, F., Sonet, J.: The lower Paleozoic “Lesser Himalayan” granitic belt: emphasis on the Simchar pluton of Central Nepal. In: Shams, F.A. (ed.) Granites of Himalayas, Karakoram and Hindukush, pp. 235–255. Institute of Geology, University of the Punjab, Lahore, Pakistan (1983)Google Scholar
  4. 4.
    Jan, M.Q., Asif, M., Tazeem, T., Kamal, M.: Tectonic subdivision of granitic rocks of north Pakistan. Geol. Bull. Univ. Peshawar 14, 159–182 (1981)Google Scholar
  5. 5.
    Shams, F.A.: Granites of Himalayas Karakorum and Hindu Kush. Institute of Geology, University of the Punjab, Lahore, Pakistan (1983)Google Scholar
  6. 6.
    Chaudhry, M.N., Hussain, S.S., Dawood, H.: The lithostratigraphic framework of northwest Himalaya, south of the main mantle thrust along the Mingora-Doggar section, Swat Zone, Pakistan. Pakistan J. Geology 1, 29–40 (1992)Google Scholar
  7. 7.
    Rehman, H., Lee, H.Y., Chung, S.L., Khan, T., O’Brien, P.J., Yamamoto, H.: Source and mode of the Permian Panjal Trap magmatism: evidence from zircon U–Pb and Hf isotopes and trace element data from the Himalayan ultrahigh-pressure rocks. Lithos 260, 286–299 (2016)Google Scholar
  8. 8.
    DiPietro, J.A., Isachsen, C.E.: U-Pb zircon ages from the Indian plate in northwest Pakistan and their significance to Himalayan and pre-Himalayan geologic history. Tectonics 20, 510–525 (2001)CrossRefGoogle Scholar
  9. 9.
    Anczkiewicz, R., Oberli, F., Burg, J.P., Villa, I.M., Gunther, D., Meier, M.: Timing of normal faulting along the Indus Suture in Pakistan Himalaya and a case of major 231Pa/235U initial disequilibrium in zircon. Earth Planet. Sci. Lett. 191, 101–114 (2001)CrossRefGoogle Scholar
  10. 10.
    Chappell, B.W., White, A.J.R.: Two contrasting granite types. Pac. Geol. 8, 173–174 (1974)Google Scholar
  11. 11.
    Murata, M., Yoshida, T.: Trace elements behavior in Miocene I-type and S-type granitic rocks in the Ohmine district, central Kii peninsula. J. Assoc. Mineral. Petrolo. Econ. Geol. 80, 227–246 (1985)CrossRefGoogle Scholar
  12. 12.
    Le Bas, M.J., Mian, I., Rex, D.C.: Age and nature of carbonatite emplacement in north Pakistan. Geol. Rundsch. 76(2), 317–323 (1987)CrossRefGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Tahseenullah Khan
    • 1
    Email author
  • Abid Ahmad
    • 2
  • Hafiz Ur Rehman
    • 3
  • Muhammad Nawaz Chaudhry
    • 4
  • Mamoru Murata
    • 5
  • Muhammad Zafar
    • 1
  1. 1.Department of Earth and Environmental SciencesBahria UniversityIslamabadPakistan
  2. 2.Pakistan Institute of Engineering and Applied Sciences, Atomic Energy CommissionNilore, IslamabadPakistan
  3. 3.Department of Earth and Environmental Science, Faculty of ScienceKagoshima UniversityKagoshimaJapan
  4. 4.Department of Environmental Science and Policy, Faculty of Basic SciencesLahore School of Economics, Barki RoadLahorePakistan
  5. 5.Department of Geosciences, Faculty of ScienceNaruto University of EducationTokushimaJapan

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