Crustal Shortening in Convergent Orogens: Insights from Global Positioning System (GPS) Measurements in Northeast India
IR@C-MMACS: CSIR-Centre for Mathematical Modelling and Computer Simulation, Bangalore
View Archive Info| Field | Value | |
| Title |
Crustal Shortening in Convergent Orogens: Insights from Global
Positioning System (GPS) Measurements in Northeast India
|
|
| Creator |
Mukul, Malay
Jade, Sridevi |
|
| Subject |
GNSS/GPS Geodesy
|
|
| Description |
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.
|
|
| Publisher |
Springer
|
|
| Date |
2010-01
|
|
| Type |
Article
PeerReviewed |
|
| Format |
application/pdf
|
|
| Identifier |
http://cir.cmmacs.ernet.in/124/1/Mukuletal2010.pdf
Mukul, Malay and Jade, Sridevi (2010) Crustal Shortening in Convergent Orogens: Insights from Global Positioning System (GPS) Measurements in Northeast India. Journal of Geological Society of India, 75 (1). pp. 302-312. ISSN ISSN: 0016-7622 (print version) ISSN: 0974-6889 (electronic version) |
|
| Relation |
http://www.springerlink.com
http://cir.cmmacs.ernet.in/124/ |
|