Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Fission track ages of 10 samples of muscovite and biotite collected from different areas of Paddar Valley, Kishtwar (J and K State, India) have been determined. The mean ages obtained for this region for muscovite and biotite are 6.9±1.4 and 38.2±4.2 m.y, respectively. The micaceous minerals have been found to contain low concentration of Uranium ∼ 10-10 atom/atom. The f.t. ages correspond to the Tertiary era of the great Himalayan range and agree very well with the f.t. ages determined for the Himalayan orogeny.
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