First-order kinematics of wedge-scale active Himalayan deformation: Insights from Darjiling–Sikkim–Tibet (DaSiT) wedge
IR@C-MMACS: CSIR-Centre for Mathematical Modelling and Computer Simulation, Bangalore
View Archive Info| Field | Value | |
| Title |
First-order kinematics of wedge-scale active Himalayan deformation: Insights
from Darjiling–Sikkim–Tibet (DaSiT) wedge
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| Creator |
Mukul, Malay
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| Subject |
GNSS/GPS Geodesy
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| Description |
The Indian Plate has collided with the Eurasian Plate along an arcuate boundary over the last 55–60 million
years defining the Himalayan Mountain belt. The geometry of the collision boundary is wedgeshaped;
the base of this wedge is defined by a decollement named the Main Himalayan Thrust (MHT).
In the Darjiling–Sikkim–Tibet (DaSiT) Himalayan wedge, a crustal-scale fault-bend fold (Kangmar Anticline)
and the Lesser Himalayan Duplex (LHD) are dominant structures that have built taper and controlled
the foreland-ward propagation of the thrust sheets. A frontal physiographic half-window has
eroded through the Main Central Thrust (MCT) sheet to expose the LHD in the DaSiT wedge. Preliminary
data suggest that active tectonics and seismicity in the DaSiT wedge may be concentrated in the half-window;
this suggests that LHD may be an active structure. High-precision Global Positioning System measurements
in the DaSiT wedge suggest that a minimum of 12 mm/yr convergence is being accommodated
in the Darjiling–Sikkim Himalaya out of which _4 mm/yr convergence is being taken up in the LHD.
Given that decollement earthquakes with minimum internal deformation in a deforming wedge occur
when it attains critical taper, continued deformation within the DaSiT wedge and the lack of great
decollement earthquakes indicate that the DaSiT Himalayan wedge is presently sub-critical and in the
process of building taper. The sub-critical nature of the DaSiT wedge is probably the result of low topographic
and decollement slopes, weaker rocks and pronounced erosion in the frontal part of the wedge.
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| Publisher |
Elsevier
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| Date |
2010
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cir.cmmacs.ernet.in/123/1/Mukul2010JAES.pdf
Mukul, Malay (2010) First-order kinematics of wedge-scale active Himalayan deformation: Insights from Darjiling–Sikkim–Tibet (DaSiT) wedge. Journal of Asian Earth Sciences, 39. pp. 645-657. ISSN ISSN: 1367-9120 |
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| Relation |
http://www.journals.elsevier.com/journal-of-asian-earth-sciences/
http://cir.cmmacs.ernet.in/123/ |
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