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

Rasoul B. Sorkhabi ¹, Kazunori Arita ¹

Affiliations
1 Department of Earth and Planetary Science, Hokkaido University, Kim 10 Nishi 8, Sapporo 060, JP

Abstract

The erosion record of the high-grade metamorphic complex of the Himalaya is preserved in the Siwalik foreland molasse. Here we propose a new method for estimation of average denudation rates in the High Himalaya during the Miocene based on the first appearance of kyanite in the Middle Siwaliks (beginning at ∼11 Ma) and of sillimanite in the Upper Siwaliks (at ∼5 Ma) and from ahe fact that these metamorphic index minerals were formed at depths of 21-24 km(thermobarometric data) during the main Himalayan metamorphic event at ∼23 Ma (geochronologic data).

Keywords

Himalaya, Siwalik, Sedimentology.

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