Petrology and sedimentation of the middle siwalik clays at dholkhand,saharanpur district,U.P., India |
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| Authors: | Nityananda Bhattacharya Sarada Saran Misra |
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| Institution: | 1. Directorate of Geology, O. N. G. Commission, Petrological Laboratory, Dehra Dun, U. P., India
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| Abstract: | The Middle Siwalik clays at Dholkhand, Saharanpur district, U. P., in India were studied to investigate the nature of Siwalik (middle Miocene to lower Pleistocene) sedimentation in relation to the tectonism associated with the Himalayan orogenesis. The clays are reddish brown to buff in color containing montmorillonite, expandable mixed-layers, degraded chlorite, and illite. The clays were studied byX-ray diffractometry using standard techniques with copper radiation. The clay mineral distribution of the Middle Siwaliks indicates that the material was deposited under continental conditions in stream channels during periods of minimum current activity. The clays were deposited by slow sedimentation and are little affected by diagenesis. Further work in this area and elsewhere are now under progress to establish the relation of Siwalik sedimentation with the uplift of the Himalayas in the Tertiary period. |
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