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Research Paper | Geophysics | India | Volume 12 Issue 9, September 2023 | Rating: 5.1 / 10
Gravity and Magnetic Surveys and Interpretation with Variable Density in the Tanjavur Sub-Basin, South of Cauvery Basin, India
M. Jyothi Prakash | T. Annapurna | D. Bhaskara Rao
Abstract: The gravity and magnetic data along the profile across the southern part of the Cauvery basin of India have been collected and the data is interpreted with variable density contract in order to deduce the structure of the sedimentary basin. The profile is taken from Nattarsankotai to Nayattapathi covering a distance of 65 km. The gravity lows and highs have clearly indicated various sub - basins and ridges. The density logs from ONGC, Chennai, show that the density contrast decreases with depth in the sedimentary basin, and hence, the gravity profile is interpreted using variable density contrast with depth. From the Bouguer gravity anomaly, the residual anomaly is constructed by graphical method by correlating with well data and subsurface geology. The residual anomaly profile is interpreted using polygon and prismatic models. The maximum depths to the granitic gneiss basement is obtained as 11 km. These studies are useful to nearby refine the subsurface geological studies. The regional anomaly is interpreted and observed that Moho rise towards coast. The aeromagnetic anomaly profile is also interpreted for charnockite basement below the granitic gneiss group of rocks using prismatic model.
Keywords: Cauvery Basin, Gravity anomaly, Variable density contrast, Bott?s method, Granitic gneiss basement, Magnetic anomaly, Charnockite Basement, Tanjavur sub - basin, Moho Depth
Edition: Volume 12 Issue 9, September 2023,
Pages: 1849 - 1855