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Deep Crustal Structure of the Son-Narmada-Tapti Lineament, Central India (Hardcover, 2012 ed.)
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Deep Crustal Structure of the Son-Narmada-Tapti Lineament, Central India (Hardcover, 2012 ed.)
Series: Springer Theses
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With a length of about 1200 km, the Son-Narmada-Tapti Lineament
(NSL) is one of the most prominent geomorphic features in the
Indian subcontinent. Anomalous conductive bodies are delineated at
mid-lower crustal depths below major earthquake epicentral zones.
The region has been interpreted as the collision zone of the Indian
Plate with the Eurasian Plate. The NSL zone is therefore also known
to be the second most important tectonic feature in the Indian
geology, after the Himalayas.
The present thesis describes significant new insight into the
seismotectonics of this Central India tectonic zone, based on
thorough magnetotelluric studies. The main objectives of the
present study are: (i) to delineate subtrappean sediments across
the NSL region along four different traverses, (ii) to understand
the characterization of geo-electrical structure of the crust and
examine the nature of geo-electrical signatures of the known
faults, (iii) to integrate the results with other geophysical data
such as seismicity, gravity and heat flow, in order to understand
the tectonic scenario of the region.
Deep electromagnetic (magnetotelluric) analyses were integrated in
this study with gravity, seismic and heat flow studies and
distinct, delineated deep crustal features. The resulting high
conductivity is justified with the presence of fluids at mid-lower
crustal depths. The migration of these fluids from mantle to
mid-lower crustal depths through pre-existing brittle
fracture/fault zones were obviously caused by the plume related to
the Deccan volcanism. Migration of the fluids generated a higher
fluid pressure along the faults and resulted in earthquakes.
Based on the geo-electric sections derived along the four traverses
of the Narmada-Son Lineament Zone, the present study gives
important clues on the subduction/collision history in this
important tectonic zone.
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