Table 3: Petrographic modal of Jhelum riverbed gravel Constituents 25mm 19.5mm 12.5mm 9.5mm 4.75mm Quartzite* 59.5 60.6 64.0 61.7 65.3 Volcanics* 22.3 23.8 23.0 22.2 21.0 Granite / Micro Granodiorite* 5.5 3.5 3.2 4.6 3.5 Lithic Arenite* 3.0 2.2 1.5 2.1 1.4 Diorite / Tonalite 1.6 0.7 0.4 0.7 0.6 Quartz Wacke* 1.7 2.6 2.3 2.3 2.4 Greywacke* 1.3 1.4 1.3 1.1 1.3 Chert* 0.6 0.2 0.3 1.0 0.6 Basalt 0.8 0.3 0.4 0.7 0.5 Limestone 0.3 0.2 0.2 0.3 0.3 Micro-Gabbro 0.6 0.7 0.7 0.6 0.6 Vein Quartz 0.8 0.2 0.0 0.0 0.1 Slate / Phyllite* 0.4 0.6 0.3 0.4 0.3 Dolerite / Microdolerite 1.3 2.3 2.0 1.8 1.7 Marble 0.1 0.1 0.0 0.1 0.1 Granite Mylonite* 0.2 0.3 0.2 0.3 0.2 Epidosite 0.1 0.3 0.2 0.1 0.2 Total 100 100 100 100 100 ASR Susceptible 94.5 95.2 96.1 95.7 96 Minerals/rock types with asterisk are ASR susceptible