The Peshawar Plain Alkaline Igneous Province, NW Pakistan
Abstract
Complexes of alkaline rocks are distributed in a semicircle around the northern half of Peshawar Plain, NW Pakistan. Stretching west to east for over 200 km, they occur in eastern Afghanistan, Mohmand Agency, Khyber Agency, Warsak, Malakand, Shewa-Shahbazgarhi, Koga-Ambela-Utla, Tarbela and, possibly, Mansehra; also in Dir. The rocks include alkaline granites and microgranites, syenites, albitites, and carbonatites, intruded generally along fault zones into mainly Early Palaeozoic metasediments. It is proposed that they are associated with rifting, caused partly by rebound' relief tension or compression release, perhaps during very Late Cretaceous or Early Tertiary times, following contact between the Indian plate and the island arc(s) or southern margin of the Eurasian plate.
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