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Journal Article

Thrust Shear Sense and Shear Zone Fabrics in the Higher Himalaya, Siyom Valley, Eastern Arunachal Himalaya, India Available to Purchase

Tapos Kumar Goswami, Sukumar Baruah, Bashab Nandan Mahanta, Pranjit Kalita, Polash Bora
Published: 01 November 2020
Jour. Geol. Soc. India (2020) 96 (5): 447–457.
DOI: https://doi.org/10.1007/s12594-020-1582-1
...Tapos Kumar Goswami; Sukumar Baruah; Bashab Nandan Mahanta; Pranjit Kalita; Polash Bora Abstract The Higher Himalayan Crystallines (HHC) in the Siyom river section of eastern Arunachal Himalaya, display top-to- ESE compressional ductile shear from Pene to Menchuka. In this part of the Himalayan...
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S-C fabrics in HHC. (a) The sigmoidal S-surfaces are deflected near the C-surfaces in the garnet –kyanite schist near Hirgo. The angle between S and C is ~21°. The sense of shear is top-to-ESE. (b) Intensely sheared mylonitic granite near Pene. The late extensional C′ -plane also further deflects the S –surfaces. (c) The C -plane deflecting S-surface in quartz-biotite schist near Menchuka (d) The sub-horizontal C-planes making acute angle with S-surfaces near Yapik village. The sense of shear is top-to-ESE. (Locations: Hirgo: 28°30'53.3"N: 94°26'99.8"E; Yapik: 28°30'69.3"N: 94°28'54.2" E; Menchuka: 28°36'036" N: 94°07'853" E)

S-C fabrics in HHC. (a) The sigmoidal S-surfaces are deflected near the C... Available to Purchase

Published: 01 November 2020
further deflects the S –surfaces. (c) The C -plane deflecting S-surface in quartz-biotite schist near Menchuka (d) The sub-horizontal C-planes making acute angle with S-surfaces near Yapik village. The sense of shear is top-to-ESE. (Locations: Hirgo: 28°30'53.3"N: 94°26'99.8"E; Yapik: 28°30'69.3"N: 94
Image
The field relationship along HHC in Siyom Valley showing the folded metamorphic isograd model (drawn from Searly et al, 2008 and references therein).The shaded area shows the zones of partial melting (containing sillimanite + K- feldspar) at Tato and Rego. The isograds have been sheared by ESE directed simple shear. The isograds are flattened to the MCT ductile shear zone as shown in the figure. Below the ductile zone, the MCT brittle fault has a thrusted contact with the LHS at Pene. In the upper part, the right way –up isograd below STD is shown. b. The structural interpretation of the HHC along Siyom valley from Pene to Menchuka in ESE –WNW cross section (looking north). The diagram is not in scale.1. Top-to-ESE upward ductile compressional shear, 2. Boudins, 3. Top-to ESE brittle-ductile compressional shear; MCT: Main Central Thrust; HHC: Higher Himalayan Crystallines; STDS: South Tibetan Detachment System; TH: Tethyan Himalaya; BD: Basal Detachment. The interpretation is based on the surface geology and the extent and geometry of the structures in the subsurface is only based on speculation. The basal detachment inside HHC is based on findings from the other sections (Mukherjee, 2012 and references therein).

The field relationship along HHC in Siyom Valley showing the folded metamor... Available to Purchase

Published: 01 November 2020
of the HHC along Siyom valley from Pene to Menchuka in ESE –WNW cross section (looking north). The diagram is not in scale.1. Top-to-ESE upward ductile compressional shear, 2. Boudins, 3. Top-to ESE brittle-ductile compressional shear; MCT: Main Central Thrust; HHC: Higher Himalayan Crystallines; STDS: South
Journal Article

Litho-stratigraphy of Cretaceous Tidding Suture Package with Ophiolite Emplacements in Eastern Arunachal Himalaya: An Analysis Available to Purchase

M. Burhanuddin
Published: 01 August 2024
Jour. Geol. Soc. India (2024) 100 (8): 1113–1121.
DOI: https://doi.org/10.17491/jgsi/2024/173959
.... The Mesozoic sedimentary cover on the Higher Himalayan Crystalline (HHC) up to the contact of THS; however, is considered as Neo Tethyan Sequence - NTS ( Gansser, 1964 ). The Neo-Tethyan subduction of western part is interpreted as an event before major Cenozoic India-Asia collision with a Andean type ( Ramos...
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