Aeromagnetic data analysis of the Southern Aravalli Fold Belt: Its implications in understanding the inter-relationship among the migmatites and Gneissic Rocks, Aravalli supracrustals and Godhra granite

Subsurface profiling of granite pluton using microtremor method: southern Aravalli, Gujarat, India

“…The granite pluton attains shallowest depth calculated from surface underneath station 20 (35.69 m) and station 23 (32.42 m) followed by a significant depth, or a 'low', beneath station 6 (243.64 m) and station 1 (232.82 m) towards W. C-Gr boundary follows a steep slope between stations 7 (45.40 m) and 6 (243.64 m). The low along profile between stations 1 and 6 marks an extension of the younger Champaner rocks exposed around stations 7 and 8 (Rajgarh Formation) and is confirmed based on aeromagnetic data (Sahu 2012).…”

“…The P-Qr boundary shows a steep plunge E of the granite pluton hump and 15° gentle plunge due W. The profile highlights subsurface extension of the Champaner Group further W overlain by Mesozoic sedimentaries and thin cover of Deccan basalt between stations 1 and 7. Numbers in the figure indicate (i) granite, (ii) quartzites, (iii) phyllites, (iv) conglomerate, (v) Mesozoic sedimentaries, and (vi) Deccan basalt data (Sahu 2012). The boundary between the Rajgarh Formation and Mesozoic sediments is ~70 m deep.…”

“…Several geophysical methods are deployed to study plutons, viz. gravity (Bott 1955;Vigneresse 1990;Singh et al 2004;Rao et al 2006;Cruden 2008;Singh et al 2014), magnetic (Mamtani and Greiling 2005); aeromagnetic (Sahu 2012) magnetotelluric (Sastry et al 2008); deep resistivity soundings (Singh et al 2008); and deep seismic methods (Kaila et al 1981;Dixit et al 2010).…”