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Deep Crustal Structure of the Son-Narmada-Tapti Lineament, Central India (Paperback, Softcover reprint of the original 1st ed. 2012)
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Deep Crustal Structure of the Son-Narmada-Tapti Lineament, Central India (Paperback, Softcover reprint of the original 1st ed. 2012)
Series: Springer Theses
Expected to ship within 10 - 15 working days
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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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