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

Published online by Cambridge University Press:  01 May 2009

R. G. Davies
Affiliation:
Geological Survey Institute, P.O. Box 1555 Tehran, Iran
A. R. Crawford
Affiliation:
Department of Geophysics and Geochemistry, Institute of Advanced Studies, Australian National University, Canberra, Australia2600.

Summary

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.

Type
Articles
Copyright
Copyright © Cambridge University Press 1971

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