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

Trilochan Singh ¹

Affiliations
1 WIHG, Arunachal Unit, IN

Abstract

No Abstract.

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Trilochan Singh ¹

Affiliations
1 Wadia institute of Himalayan Geology, Dehra Dun, IN

Abstract

No Abstract.

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Surendar Kumar ¹, Trilochan Singh ¹

Affiliations
1 Wadia Institute of Himalayan Geology, Dehradun, 248 001, IN

Abstract

The geological setting of the Subansiri District is mostly controlled by the fold belt, a steep sided anticlinorium in the Quartzite - Phyllite Unit of the Bomdila Group that possibly overlies an Older Massif and a concealed deep seated fault. Amongst the economic minerals and are deposits, limestone, dolomite, coal, graphite, and various base metals are of great intetest. Beside these, sulphide mineralisation is quite common. Mainly four controls on the mineralisation have been recognised, which are:

1. Deposits are strata-bound within the Phyllite - Quartzite Unit of the Bomdila Group and the Quartzite Unit of the Miri Group.

2. Ore occurs mostly near the thrust contact zone.

3. The deposits in rocks of both the units are located near the gneissic contact of the Bomdila Group as well as that of the crystallines of the Se La Group.

4. The Pb-Zn, Fe & S in the Bomdila Group show pockets and pinch and swell structures indicating earlier deposits subjected to erosional processes in the earlier phases.

Other deposits are in the Quartzite Unit of the Miri Group which are located close to the crystalline thrust.

Keywords

Structure, Tectonics, Economic Geology, Subansiri, Arunachal Pradesh.

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Trilochan Singh ¹

Affiliations
1 Wadia Institute of Himalayan Geology Dehra Dun, IN

Abstract

No Abstract.

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Trilochan Singh ¹, Rajeev Upadhyay ²

Affiliations
1 Wadia institute of Himalayan Geology, itanagar -791113, IN
2 Department of Geology, Kurnaun University, Nainital, IN

Abstract

No Abstract.

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Trilochan Singh ¹

Affiliations
1 Wadia Institute of Himalayan Geology, North East Unit, Itanagar - 791 113, Arunachal Pradesh, IN

Abstract

The geology of Itanagar Capital Complex of Arunachal Pradesh is least known. It constitutes mainly Siwalik sediments and unconsolidated Quaternary deposits. The Siwalik sediments are represented by Dafla, Subansiri and Kimin Formations belonging to the Middle Siwalik. The Quaternary sediments have been classified into four formations, viz , Itanagar Formation, Banderdewa Formation, Sonajuli Formation and Pachin Formation. Structurally, the area is squeezed between the Himalayan Frontal Fault in the south and the Bomdila Thrust in the north, and is traversed by a number of other local thrusts and active faults. Morphological features indicating neotectonic activity suggest that the area is geodynamically active.

Keywords

Stratigraphy, Geomorphology, Neotectonism, Siwlik Group, Itanagar, Arunachal Himalaya.

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