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Mukul, Malay
- Overburden-Induced Flattening Structure in the Himalaya: Mechanism and Implication
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Authors
Affiliations
1 Department of Geology, University of Calcutta, Kolkata 700 019, IN
2 Department of Earth Sciences, Indian Institute of Technology Bombay, Mumbai 400 076, IN
1 Department of Geology, University of Calcutta, Kolkata 700 019, IN
2 Department of Earth Sciences, Indian Institute of Technology Bombay, Mumbai 400 076, IN
Source
Current Science, Vol 109, No 10 (2015), Pagination: 1814-1821Abstract
Small-scale structures in fold-thrust belt are mainly formed in response to the emplacement of thrust sheets. However, some small-scale structures may not be developed directly in response to the emplacement of thrust sheets, but might be genetically tied with the orogenic process. Metre- to centimetre-scale late-stage folds on foliation in phyllite with near-recumbent fold geometry are selectively developed with a specific spatial distribution, particularly in places where the foliation is steeply dipping, in the Ramgarh thrust sheet in the Darjiling-Sikkim Himalaya. The recumbent-fold structures appear to have been formed in response to overburden-induced vertical compressive deformation on steep dipping foliation, especially in the subvertical southern limb of the antiformal structure of the Lesser Himalayan Duplex in the Darjiling-Sikkim Himalaya. The role of gravity and overburden in the formation of these structures from worldwide orogenic belts may be considered to validate their genesis.Keywords
Orogeny, Overburden-Induced Flattening, Recumbent Fold, Thrust Sheet.Full Text
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- Seismotectonic Implications of Strike-Slip Earthquakes in the Darjiling-Sikkim Himalaya
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Authors
Affiliations
1 Department of Earth Sciences, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, IN
2 CSIR-4PI, Formerly CSIR-CMMACS, Wind Tunnel Road, Bangalore 560 037, IN
3 Department of Geology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, IN
1 Department of Earth Sciences, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, IN
2 CSIR-4PI, Formerly CSIR-CMMACS, Wind Tunnel Road, Bangalore 560 037, IN
3 Department of Geology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, IN
Source
Current Science, Vol 106, No 2 (2014), Pagination: 198-210Abstract
The Darjiling-Sikkim Himalaya (DSH) is located over the Dharan-Gorubathan salient-recess pair and moderate thrust and strike-slip earthquake occur here. The hypocentres cluster not only near the location of the Main Himalayan Thrust (MHT) or the basal decollement of the Himalayan wedge, but also well above and below it. The epicentres cluster over the mapped location of the Lesser Himalayan Duplex (LHD), suggesting that both MHT and LHD are active structures in DSH. The earthquakes below MHT can be related to transverse strike-slip faulting in DSH associated with salient-recess transition on both flanks of the Dharan salient. The 18 September 2011 (Mw 6.9) strike-slip event suggests that the western flank of the Dharan salient is also likely to contain an active transverse strike-slip fault like the Gish Transverse Fault (GTF) on its eastern flank. High-precision Global Positioning System measurements (1997-2006) indicate that a maximum of ∼4 mm/year convergence is being accommodated in the Tista Half-Window or LHD west of the surface trace of GTF and DSH is locked south of 27°N both east and west of GTF about 10 km north of the Himalayan mountain front. About 3-4 mm/year sinistral strike-slip is postulated on GTF north of 27°N. Dislocation based forward modelling using two thrust dislocations with oblique slip and a sinistral strike-slip dislocation generated velocities that were closest to the measured back-slip velocity field in DSH.Keywords
Darjiling–Sikkim Himalaya, Dislocation Modelling, Global Positioning System, Gish Transverse Fault, Recess, Salient, Seismicity.Full Text
- Sedimentary Facies and Soft-Sediment Deformation Structures in the Late Miocene-Pliocene Middle Siwalik Subgroup, Eastern Himalaya, Darjiling District, India
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Authors
Affiliations
1 Department of Geology, Asutosh College, 92, S. P. Mukherjee Road, Kolkata-700 026, IN
2 Department of Geology, University of Calcutta, 35, Ballygunj Circular Road, Kolkata-700 029, IN
3 Department of Earth Sciences, Indian Institute of Technology, Powai, Mumbai - 400 076, IN
4 Department of Geology, University of Pretoria, Pretoria 0002, ZA
1 Department of Geology, Asutosh College, 92, S. P. Mukherjee Road, Kolkata-700 026, IN
2 Department of Geology, University of Calcutta, 35, Ballygunj Circular Road, Kolkata-700 029, IN
3 Department of Earth Sciences, Indian Institute of Technology, Powai, Mumbai - 400 076, IN
4 Department of Geology, University of Pretoria, Pretoria 0002, ZA
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 4 (2011), Pagination: 321-336Abstract
The Himalayan fold-and-thrust belt has propagated from its Tibetan hinterland to the southern foreland since ∼55 Ma. The Siwalik sediments (∼20 - 2 Ma) were deposited in the frontal Himalayan foreland basin and subsequently became part of the thrust belt since ∼12 Ma. Restoration of the deformed section of the Middle Siwalik sequence reveals that the sequence is ∼325 m thick. Sedimentary facies analysis of the Middle Siwalik rocks points to the deposition of the Middle Siwalik sediments in an alluvial fan setup that was affected by uplift and foreland-ward propagation of Greater and Lesser Himalayan thrusts. Soft-sediment deformation structures preserved in the Middle Siwalik sequence in the Darjiling Himalaya are interpreted to have formed by sediment liquefaction resulting from increased pore-water pressure probably due to strong seismic shaking. Soft-sediment structures such as convolute lamination, flame structures, and various kinds of deformed cross-stratification are thus recognized as palaeoseismic in origin. This is the first report of seismites from the Siwalik succession of Darjiling Himalaya which indicates just like other sectors of Siwalik foreland basin and the present-day Gangetic foreland basin that the Siwalik sediments of this sector responded to seismicity.Keywords
Soft-Sediment Deformation, Seismite, Siwalik, Neogene, Foreland Basin, Siwalik Sedimentary Facies.
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- The Lesser Himalayan Duplex in Sikkim: Implications for Variations in Himalayan Shortening
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Authors
Affiliations
1 Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY 14627, US
2 CSIR Centre for Mathematical Modelling and Computer Simulation, Bangalore - 560 037, IN
1 Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY 14627, US
2 CSIR Centre for Mathematical Modelling and Computer Simulation, Bangalore - 560 037, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No Spl Iss 1 (2010), Pagination: 289-301Abstract
Thrust duplexes account for large fractions of the total shortening in most fold-thrust belts (FTBs). They also provide an efficient mechanism for transferring slip upward from the basal decollement and for transporting roof thrust sheets over long distances. The Lesser Himalayan duplex (LHD) plays a prominent role in the overall evolution of the Himalayan FTB and has been described from Garhwal-Kumaon to Bhutan. In Sikkim the LHD shows unique structural geometry and has been responsible for transporting crystalline thrust sheets (MCT 1 and MCT 2) farther southward than other parts of the Himalaya. Such lateral variations in LHD geometry imply variations in the kinematic history of the Lesser Himalaya and variations in shortening and shortening history along the length of the Himalayan arc, and these are reflected in observable large scale structural patterns.Keywords
Duplex Kinematics, Balanced Cross-Section, Fold-Thrust Belt, Lesser Himalaya, Darjeeling-Sikkim.References
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Affiliations
1 CSIR Centre for Mathematical Modelling and Computer Simulation, Bangalore - 560 037, IN
2 Department of Physics, Tezpur University, Tezpur - 784 028, IN
3 North East Space Application Centre, Umiam - 793 103, Meghalaya, IN
1 CSIR Centre for Mathematical Modelling and Computer Simulation, Bangalore - 560 037, IN
2 Department of Physics, Tezpur University, Tezpur - 784 028, IN
3 North East Space Application Centre, Umiam - 793 103, Meghalaya, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No Spl Iss 1 (2010), Pagination: 302-312Abstract
Deformation in active mountain belts like the Himalaya is manifested over several spatial and temporal scales and collation of information across these scales is crucial to an integrated understanding of the overall deformation process in mountain belts. Computation and integration of geological shortening rates from retrodeformable balanced cross-sections and present-day convergent rates from deforming mountain belts is one way of integrating information across time-scales. The results from GPS measurements carried out in NE India indicate that about 15-20 mm/yr of convergence is being accommodated there. Balanced-cross sections from the NE Himalaya indicate about 350-500 km of shortening south of the South Tibet Detachment (STD). Geothermobarometry suggest that the rocks south of the STD deformed under peak metamorphic conditions at ~ 22 Ma. This indicates a geological convergence rate of ∼ 16-22 mm/ yr which appears to be fairly consistent with the GPS derived convergence rates. Approximately 1.5 to 3.5 mm/yr (∼ 10- 20 %) of the total N-S of the present-day convergence in the NE Himalaya is accommodated in the Shillong Plateau. In addition, ∼ 8-9 mm/yr of E-W convergence is observed in the eastern and central parts of the Shillong Plateau relative to the Indo-Burman fold-thrust belt. Balanced cross-sections in the Indo-Burman wedge together with higher resolution GPS measurements are required in the future to build on the first-order results presented here.Keywords
GPS Geodesy, North East Himalaya, Geological Shortening, Convergence, Active Tectonics.References
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