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Petrography and age of the rocks of Bulland Hill, Kirana Hills, Sarghoda District, West Pakistan

  • R. G. Davies (a1) and A. R. Crawford (a2)

Petrographic and geochronological studies of the rocks of Bulland Hill, an inlier of basement in the Punjab alluvium, are reported. Acid and basic pyroclastic and high-level intrusive types give an Rb–Sr isochron age of 870±40 million years. The previous correlation with the Malani Rhyolite Series of north-western India must be abandoned.

A porphyry boulder from the Permo-Carboniferous boulder bed, probably a tillite, in the Salt Range has the same age as the Bulland Hill rocks.

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Crawford, A. R. 1970. The Precambrian geochronology of Rajasthan and Bundelkhand, northern India. Can. J. Earth Sci. 7, 91110.
Crawford, A. R. & Compston, W. 1970. The age of the Vindhyan System. Q. Jl geol. Soc. Lond. 125, 351–71.
Heron, A. M. 1913. The Kirana and other Hills in the Jech and Rechna Doabs. Rec. geol. Surv. India, 43, 229–36.
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McIntyre, G. A., Brooks, C., Compston, W. & Turek, A. 1966. The statistical assessment of Rb-Sr isochrons. J. geophys. Res. 71, 5459–68.
Tugarinov, A. I., Shanin, L. L., Kazakov, G. A. & Arakelyants, M. M. 1965. On the glauconite ages of the Vindhyan System (India) Geokhimiya, No. 6 of 1965, 652–60 (in Russian).
Vinogradov, A. P., Tugarinov, A. I., Zhikov, C. I., Stupnikova, N. I., Bibikova, E. V., Knorre, K. G. & Melnikova, G. L. 1966. Geochronology of the Precambrian of India. In: Absolute Dating of Tectonomagmatic Cycles and Stages of Orogeny during 1964, pp. 394408, Moscow, Academy of Sciences (in Russian).
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Geological Magazine
  • ISSN: 0016-7568
  • EISSN: 1469-5081
  • URL: /core/journals/geological-magazine
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