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Matin, Abdul
- Overburden-Induced Flattening Structure in the Himalaya: Mechanism and Implication
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PDF Views:88
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
Abstract Views :296 |
PDF Views:93
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
- Submagmatic Fabric in the 2.6 Ga Bundelkhand Granitoid, India:Evidence from Microstructure
Abstract Views :263 |
PDF Views:99
Authors
Affiliations
1 Department of Geology, University of Calcutta, Kolkata 700 019, IN
2 Centre of Advanced Study in Geology, University of Lucknow, Lucknow 226 007, IN
1 Department of Geology, University of Calcutta, Kolkata 700 019, IN
2 Centre of Advanced Study in Geology, University of Lucknow, Lucknow 226 007, IN
Source
Current Science, Vol 112, No 02 (2017), Pagination: 348-354Abstract
Primary foliations in igneous rocks are the key to understanding processes within the magma chamber, cooling history, paleostress regime and strain during emplacement of granitoid plutons. In the 2.6 Ga Bundelkhand granitoid rocks, weak to moderately strong regional fabric is the result of submagmatic grainsupported flow during syn-kinematic emplacement of the magma. Microstructural and outcrop-scale evidences provide an excellent record for interpreting the significance of this fabric development vis-a-vis rheological state during fabric formation. Preferentially oriented tabular feldspar phenocrysts in the granitoid show deformation such as reformed shape, marginal fragmentation and recrystallization, whereas the finer interstitial grains of quartz remain undeformed or mildly deformed. On the basis of the characteristic foliated structure of the Bundelkhand granitoid and the specific contrasting deformation characteristics of feldspar and quartz grains, we propose that the fabric is submagmatic in origin and perhaps formed during syn-emplacement deformation environment of the granitoid.Keywords
Igneous Rocks, Microstructure, Submagmatic Fabric, Syntectonic Emplacement.Full Text