Notes on the Dolerite Dykes in Northern Hazara

Abstract

The dolerite veins occur as dykes and sills. They vary in thickness from on to ten feet. The sills are mostly schistose metadolerites, intensely sheared and folded. There foliation is generally parallel to the general strike. The dykes are cross-cutting veins, very massive, jointed, and have always chilled margins against the country rock. They are relatively more abundant in altered veins. These diabases are dirty green friable rocks almost completely weathered to dark green clays. They are characteristically abundant along fault zones.