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Petrogenesis of Cenozoic sediments of north-western Himalayas

Published online by Cambridge University Press:  01 May 2009

R. S. Chaudhri
R. S. Chaudhri
Affiliation:
Centre of Advanced Study in Geology, Panjab University, Chandigarh, India
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Summary

Cenozoic rocks of north-western Himalayas (excluding the sub-Recent, Recent and Karewa deposits) are represented by the Subathu, Dagshai, Kasauli and Siwalik rocks, which together have a thickness of over 10,000 m and range in age from Upper Palaeocene to Middle Pleistocene. From field and laboratory investigations it is propounded that these sediments, except the Middle and Upper Siwalik, have been derived from low and medium grade metamorphic rocks, acid plutonics and sedimentary rocks of the nearby Himalayan terrains. For the Middle and Upper Siwalik rocks, detritus was supplied by sedimentary and trap rocks as well as by the underlying medium and high grade metamorphic and plutonic rocks. A major part of these sediments has been derived from the rising Himalayas rather than from the Peninsular Shield as believed hitherto. The Subathu rocks were deposited in shallow to moderately deep marine environments; the Dagshai rocks under shallow freshwater conditions; and the Kasauli and Siwalik rocks in a shallow fast-sinking basin. All these sediments accumulated under conditions of rapid erosion, short transportation and rapid deposition.

Type
Articles
Information
Geological Magazine , Volume 108 , Issue 1 , January 1971 , pp. 43 - 48
Copyright
Copyright © Cambridge University Press 1971

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