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Authors
Affiliations
1 Spl Grp , Frontier Basins, ONGC, Dehra Dun - 248 195, IN
2 KDMIPE, ONGC, Dehra Dun - 248 195, IN
3 Department of Geology, DBS College, Dehra Dun - 248 001
4 Dhansiri Valley Monitoring Grp , A & A A Basin ONGC, Jorhat, Assam - 785 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 66, No 5 (2005), Pagination: 561-572
Abstract
Variation in Tectono-Stratigraphic levels of the Sundernagar volcanics/Mandi-Darla volcanics has been soliciting a logical causative - either stratigraphic or tectonic. This communication explains the observed variation to be a reflection of actual stratigraphic separation between two sequences.
Based on field evidences and geochemical characteristics, two distinct magmatic episodes are established within the Shall-Simla sequences of Himachal Pradesh. The two magmatic episodes are formally identified as 'Mandi Complex' and 'Tattapani Complex' (generally referred to as Sundernagar volcanics/Mandi-Darla volcanics) - the former being Pre-Shali and the latter Post-Shali/pre-Simla.
A modified stratigraphy of the area, as per the Code of stratigraphic nomenclature of India has been proposed.
Keywords
Shali Stratigraphy, Igneous Geochemistry, Tattapani Complex, Himachal Pradesh.
