The Geology and Petrography of Deshai-Diwangar Area; Ushu Gol Valley, Swat Kohistan
Abstract
This paper presents a geological map, petrography and structure of about 160 square kilometres of Deshai-Diwangar area, Swat Kohistan. The area consists of metasedimentary rocks (? Palaeozoic to Mesozoic), intruded by Tertiary Plutonic igneous rocks. The Plutonic rocks consist of gneissose-quartz diorites, orbicular diorites, and quartz diorites of Early to Middle Tertiary period. The Early Tertiary gneissose quartz diorites are intruded by Diwangar Granite (? Middle Tertiary). Locally, small granitic intrusions and veins of a later age than Diwangar Granite are irregularly distributed in the area. Pegmatites and aplites are associated with all types of rocks. Structurally the area is not very complex. A main fault runs along the Ushu Valley and is older than the Diwangar granite.
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