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

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Tattapani Complex: a New formation at the Base of Simla Group, Himachal Pradesh


Affiliations
1 Spl Grp , Frontier Basins, ONGC, Dehra Dun - 248 195, India
2 KDMIPE, ONGC, Dehra Dun - 248 195, India
3 Department of Geology, DBS College, Dehra Dun - 248 001
4 Dhansiri Valley Monitoring Grp , A & A A Basin ONGC, Jorhat, Assam - 785 001, India
     

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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.
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  • Tattapani Complex: a New formation at the Base of Simla Group, Himachal Pradesh

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Authors

Himadri S. Chatterjee
Spl Grp , Frontier Basins, ONGC, Dehra Dun - 248 195, India
Narender Pendkar
KDMIPE, ONGC, Dehra Dun - 248 195, India
Ajay K. Biyani
Department of Geology, DBS College, Dehra Dun - 248 001
Dipankar Dutta
KDMIPE, ONGC, Dehra Dun - 248 195, India
Manish Shukla
Dhansiri Valley Monitoring Grp , A & A A Basin ONGC, Jorhat, Assam - 785 001, India

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.