Fission track age of zircon separates of the tuffaceous mudstones of the Upper Siwalik subgroup of Jammu- Chandigarh sector of the Punjab sub- Himalaya

Abstract

Fission track ages of zircon grains separated from tuffaceous mudstone/beotonitic tuffs of the Upper Siwalik subgroup of Chandigarh (Ghaggar section) and Jammu (Uttarbeni) are determined to be 2.14±0.51 Ma and 1.59 ± 0.32 Ma respectively. The zircon grains are considered to be cogenetic with the ash falls, and hence provide age estimates of the eruptive event(s). Implications of these age estimates in the understanding of chronologic framework of the Upper Siwalik subgroup of tbe Jammu-Chandigarh sector of the Himalayan Foreland are briefly discussed.