Sampling of dolerites
The dolerites of the Kirana volcanics investigated in this study include all the mafic rock suites in the compositional range of SiO2 upto 55 wt%. The rock suites categorized as dolerites consist of tholeiitic basalts, basaltlic andesites and microgabbros. The dolerites are present in quarries situated around the Bulland Hill, 126, Sheikh Hill, 116, Chak 123 and Kila Minor, 128. In all, 10 samples were collected from Bulland Hill and Sheikh Hill (Table 2) to determine modal mineralogy and carry out microprobe analyses. In addition to this, mineralogy of two samples (C-12 and C-36) was checked and analyzed by X-ray diffraction.