DSS studies over Deccan Traps along the Thuadara-Sendhwa-Sindad Profile, across Narmada-Son Lineament, India

Tectonics and thermal structure of western Satpura, India

“…The Moho is delineated with a P n velocity of 8.2 ± .05 km/s in the depth range of 38-43 km along this profile with a gentle upwarp of about 2 km between the rivers Narmada and Tapti. This upwarp coincides with the location of the graben consisting of Mesozoic sediments between the BarwaniSukta and Tapti faults (Kaila et al, 1989;Sridhar and Tewari, 2001). These structural features are indicative of continental rifting in this region.…”

“…DSS studies carried out in the past have brought out interesting information along the Thuadara-Sindad profile (Kaila et al, 1989;Sridhar and Tewari, 2001). The NSL is delineated as a basement fault in this region of central India (Fig.…”

“…As tectonics and temperature provide favorable conditions for production and accumulation of hydrocarbons, an attempt is made to determine surface heat flow using two independent parameters, i.e. P n velocity observed in Deep Seismic Sounding studies along the Thuadara-SendhwaSindad profile (Kaila et al, 1989) and Curie depth isotherms estimated using magnetic satellite data (Mishra, 1986), which are free from upper crustal disturbances although mainly temperature dependent. The result of the present study and other geophysical data has been analyzed in the light of possible presence of hydrocarbons in Mesozoic sediment underlain by Deccan Traps and seismicity of the region.…”

Origin and evolution of ‘intracratonic’ thermal fluids from central-western peninsular India

“…Such low R/R a values are in line with the very high concentration of total helium that suggests either a long residence of £uids underground or the presence of anomalously high U and Th concentrations. If these rifts extend to mantle depths, as suggested by Kaila et al [70], then whatever little 3 He that is being leaked into the thermal circuits becomes diluted due to an abnormal high concentration of 4 He produced in the crust. Perhaps this could be one of the reasons why the R/R a ratio in some of the gases (WC) is above the average crustal value of 0.02 (Table 2).…”

“…Some of these structures are considered to reach the mantle in the SONATA and Cambay areas (40 km in depth; [70]). Such a conclusion seems also to be supported by the presence of di¡use seismicity, although without the presence of destructive earthquakes.…”