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Bhakuni, S. S.
- Bathymetric Study of the Neotectonic Naini Lake in Outer Kumaun Himalaya
Abstract Views :174 |
PDF Views:1
Authors
N. H. Hashimi
1,
M. C. Pathak
1,
P. Jauhari
1,
R. R. Nair
1,
A. K. Sharma
2,
S. S. Bhakuni
2,
M. K. S. Bisht
2,
K. S. Valdiya
2
Affiliations
1 National Institute of Oceanography, Goa - 403 004, IN
2 Department of Geology, Kumaun University, Nainital - 263 002, IN
1 National Institute of Oceanography, Goa - 403 004, IN
2 Department of Geology, Kumaun University, Nainital - 263 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 41, No 2 (1993), Pagination: 91-104Abstract
The Naini lake is a product of rotational movernent on a NW-SE trending Nainital Fault, quite after the establishment of the drainage of a mature stream named Balia Nala. Detailed bathymetric study, permits division of this crescent-shaped lake into two subbasins separated by an approximately 100 m wide transverse underwater ridge, 7m to 20m below the lake surface. The southeastern and northwestern parts, 11 to 25 m and 4 to 27 m deep, respectively, are filled with unconsolidated sediments, 15 m thick on an average. The semiconsolidated sedimentary layers locally exhibit slumping an slopes and deformation in channel beds. These features together with thetransverse Central Ridge, the deep channel cutting through it, the small scarps and terraces or step-like features on the slopes of the narrow V-shaped undemater valley in the southeastern part and its thick filling in parts due to blockade resulting presumably from fault movements, and the existence of deformed and displaced acoustic reflectors are interpreted as indicating quite recent movements along the Nainital Fault. Hitherto unidentified pinnacle-like objects penetrating through or perched atop sediments, are suggestive of either tectonic displacement and squeezing or of the hazard of mass movements which have occurred. A number of small but rapidly growing deltas along shores indicate accelerated pace of sediment input, resulting from quickened erosion in the catchment area.Keywords
Naini Lake, Neotectonism, Bathymetric Study, Kumaun Himalaya.
- Ground Tilting in Likhabali Area along the Frontal Part of Arunachal Himalaya: Evidence of Neotectonics
Abstract Views :194 |
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Authors
Affiliations
1 Wadia Institute of Himalayan Geology, Northeast Unit, Itanagar, IN
2 Wadia Institute of Himalayan Geology, Dehradun, IN
1 Wadia Institute of Himalayan Geology, Northeast Unit, Itanagar, IN
2 Wadia Institute of Himalayan Geology, Dehradun, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 6 (2008), Pagination: 780-786Abstract
Present study along frontal part of the Sub-Himalayan tenam suggests neotectonic activities along thrusts and faults. Neotectonics is evident from geomorphic features such as development of terraces, stream incision, preferred stream migration and the thrusting of the Siwalik rocks over the Quaternary deposits. Southward Himalayan foreland propagation thrusting has resulted in ground tilting in the frontal part of the Himalaya and has led the streams to migrate towards Southwest. On the other hand the stream in the Sub-Himalayan terrain flows parallel to the trend of the Arunachal Himalaya, and has migrated southward. The calculated mountain front smuosity index reflects relative tectonic activity in the mountain front Thrusts and taults have controlled the drainage channels of major streams. Recent seismic activities have triggered massive landslides, which blocked the streams temporarily.Keywords
Neotectonics, Drainage-Basin Asymmetry, Ground Tilting, Stieam Incision, Mountain Front Smuosity, Terrace, Arunachal Himalaya.- Soft Sediment Deformational Structures in the Lacustrine Deposits of Ziro Valley, Lesser Himalaya, Arunachal Pradesh
Abstract Views :175 |
PDF Views:2
Authors
Affiliations
1 Wadia Institute of Himalayan Geology, NE Unit, Itanagar - 791 113, IN
2 Wadia Institute of Himalayan Geology, Dehradun - 248 001, IN
1 Wadia Institute of Himalayan Geology, NE Unit, Itanagar - 791 113, IN
2 Wadia Institute of Himalayan Geology, Dehradun - 248 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 1 (2007), Pagination: 73-78Abstract
Soft sediment deformational structures of various types are preserved in the lacustrine deposits at Soro village of Ziro valley, Lesser Himalaya, Amnachal Pradesh. The structures that have been observed include sand dykes, flame structures, load casts, micro-folds, convolute and other complex structures. The affected sediments are predominantIy loosely packed cohesionless sands and silts due to change of state from grain supported to fluid supported matrix by application of external force; and are enclosed between two undeforrned layers. Earthquake induced liquefaction is proposed for the formation of such structures taking into consideration the geodynamic conditions of the region.Keywords
Soft Sediment deformational structures, Lacustrine deposits, Seismites, Liquefaction, Ziro valley, Arunachal Pradesh, Eastern Himalaya.- Landslides along Frontal Part of Eastern Himalaya in East Siang and Lower Dibang Districts, Arunachal Pradesh, India
Abstract Views :208 |
PDF Views:2
Authors
Affiliations
1 Wadia Institute of Himalayan Geology, Northeast Unit, Itanagar - 791 113, IN
2 Wadia Institute of Himalayan Geology, Dehradun - 248 001, IN
1 Wadia Institute of Himalayan Geology, Northeast Unit, Itanagar - 791 113, IN
2 Wadia Institute of Himalayan Geology, Dehradun - 248 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 3 (2008), Pagination: 321-330Abstract
Eastern Himalayan foothills particularly between Siang and Dibang Rivers are prone to landslides. The causative factors of landslides are steep slopes, presence of major structural discontinuities, multiple joint sets, drainage density, weathered to soft nature of rocks and heavy rainfall. Most of the landslides are taking place in steep to very steep slopes. Fault gouges and brecciated rocks developed along the Main Boundary Thrust (MBT) zone have also facilitated the initiation of many landslides. Wedge analyses for sandstones and quartzites have also been carried out to determine their influence on the slope stability and potential failure. The area is also susceptible to high rate of erosion due to structurally controlled streams and gullies resulting in profuse development of fans along the foothills. Seismic condition of the region is also a major concern for the slope stability. Landslides debris usually chokes the streams, destroy the bridges, subways and roads and affect cultivated lands particularly along the mountain front. Neotectonic activity along the MBT has resulted in the development of young and steep hill-slopes, which are prone to landslides.Keywords
Landslides, Wedge Failure, Slopes, Arunachal Himalaya.- Development of Transverse Fault along North Almora Thrust, Kumaun Lesser Himalaya, India: A Study Based on Field and Magnetic Fabrics
Abstract Views :218 |
PDF Views:0
Authors
Affiliations
1 Department of Geology, Kumaun University, Nainital - 263 002, Uttarakhand, IN
2 Wadia Institute of Himalayan Geology, Dehradun - 248 001, Uttarakhand, IN
1 Department of Geology, Kumaun University, Nainital - 263 002, Uttarakhand, IN
2 Wadia Institute of Himalayan Geology, Dehradun - 248 001, Uttarakhand, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 5 (2012), Pagination: 429-448Abstract
Along the North Almora Thrust (NAT) in the Kumaun Lesser Himalaya, a zone of mylonitic rocks has developed due to strain localization during the tectonic emplacement of the Almora Nappe over the Lesser Himalayan Sequence. This zone is referred here as the NAT zone (NATZ) that is dissected by faults, which are transverse to the Himalayan orographic trend and are known as seismically active structures. Trending NNW-SSE these are the Chaukhutiya and Raintoli faults. Two E-W oriented subsidiary brittle faults across the Chaukhutiya Fault are also recognized. Based on the field study and magnetic fabric analysis an attempt has been made to evaluate the deformation and kinematic history of northeastern margin of the Almora Nappe superposed by the Chaukhutiya faulting that coincides with northeastern margin of the NAT. Field study reveals brittle-ductile and brittle regimes of deformation along the Chaukhutiya Fault. Away from the NAT variable attitudes (E-W or ENE-WSW with gentle dip) of field foliation and axial planes of folds are observed, whereas at and near the NAT the attitudes of beds, including curved lithounits, are steeply dipping and are oriented parallel with the NNW-SSE trending NAT. Curvature in fold hinge line and discontinuous occurrence of lithounits are observed along the fault.
Anisotropy of Magnetic Susceptibility (AMS) study of the rocks was carried out. It reveals that the anisotropy is controlled mostly by paramagnetic minerals, whereas ferromagnetic minerals have played a minor role. High temperature demagnetization through hysteresis curves has yielded negligible contribution of ferromagnetic minerals. The steep magnetic foliation is interpreted to be on account of NE-SW oriented progressive regional compression. Moreover, the magnetic foliation is inferred to represent a secondary foliation due to superimposition on primary foliation. Analyses of AMS and structural data indicate that the Chaukhutiya Fault has a strike-slip right lateral displacement including rotational component. AMS results reveal high anisotropy value (Pj) at the surface trace of the NAT and low anisotropy (Pj) away from it. Variable style of deformation is observed along the transverse fault length.
Keywords
Almora Nappe, North Almora Thrust, Chaukhutiya Fault, Anisotropy of Magnetic Susceptibility.References
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