Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

V. P. Singh ¹, O. P. Singh ¹, C. L. Singh ¹

Affiliations
1 Department of Geophysics, Banaras Hindu University, Varanasi - 221005, IN

Abstract

Detailed ground magnetic survey over a part of the Vindhyan basin around Damoh and Jabalpur (40 km either sides of Hirapur-Mandala DSS profile) has been carried out. The magnetic field anomaly map is characterised by dense contours in trap covered areas near Jabalpur where as the Vindhyans show sparsely distributed contours with several lows. Spectrum analysis of total ground magnetic field anomalies reveals the average thickness of Vindhyans to be 3.9 km and depth of Conrod to be 15km. The average thickness of Vindhyans is in conformity with the Deep Seismic Sounding results of the region. The thickness of Vindhyan sediments along four profiles ranges from 1.5km to 5km. The maximum thickness of Vindhyan sediments at Jabera has been derived to be 4.8km which is close to the results of Oil and Natural Gas Corporation Ltd., Dehradun.

Keywords

Geophysics, Vindhyan Basin, Magnetic Anomaly, Jabalpur, Madhya Pradesh.

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V. P. Singh ¹, O. P. Singh ¹, C. L. Singh ¹

Affiliations
1 Department of Geophysics, Banaras Hindu University, Varanasi - 221 005, IN

Abstract

Detailed ground magnetic surveys over parts of Archaeans. Satpuras and Chhattisgarh basins belonging to different ages around Mandala-Raipur has been carried out. Detailed investigations provide depth of magnetic sources, basement structural trend. nature of intrusive bodies and thickness of sediments in the basins. The basement structural trend along the five profiles in Archaeans (AA'and BB'), Satpuras (CC') and Chhattisgarh (DD' and EE') have been derived which ranges from 1.5 to 3.5 km. The Archaean and Chattisgarh basins show two dyke like features at depth of 0.28 and 1.26 km. It also reflects upwarping of the basement along the profiles.

Keywords

Geophysics, Intracratonic Basins, Archaeans, Satpuras, Chhattisgarh, Magnetic Anomaly.

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C. L. Singh ¹, G. K. Ghosh ¹

Affiliations
1 Department of Geophysics, Banaras Hindu University, Varanasi - 221 005, IN

Abstract

Magnetic and electrical investigations were carried out in an area of about 3000 sq. km in the Northeastern part of the Vindhyan basin in Varanasi-Mirzapur area of U.P. Major portion of the area surveyed is concealed under the thick blanket of Gangetic alluvium. The study has helped in delineating the topographic features of the crystalline basement as well as the trend of the Vindhyan and Bijawar sedimentation. Presence of the fault in the northern part of the area with NE-SW orientation is correlated with wrench fault mapped by Raina (1972) about 300 km in the westsouthwest direction. Its presence is also reflected in the Vindhyan sediments as revealed by magnetic and electrical sounding data. A prominent uplift in the basement is mapped to the north of Mirzamurad followed by rather steep slope further south with thicker sediments of the Vindhyan and Bijawars.

Keywords

Magnetic Methods, Electrical Methods, Wrench Fault, Crystalline Basement, Vindhyans, Varanasi, Uttar Pradesh.

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C. L. Singh ¹, T. Lal ¹, A. Kumar ¹, S. K. Prajapati ²

Affiliations
1 Department of Geophysics, Banaras Hindu University, Varanasi - 221 005, IN
2 National Geophysical Research Institute, Hyderabad - 560 007, IN

Abstract

Gravity survey was conducted in an area of about 13000 sq km covering northeastern part of Chhattisgarh Basin, Bilaspur-Raigarh gneissic belt and the central part of Mahanadi graben. Analysis of gravity anomalies has helped in the demarcation of the boundary of Chhattisgarh Basin and Mahanadi graben as well as in the determination of extent of basins and associated structures. The thickness of sediments in Chhattisgarh Basin and Mahanadi graben is estimated to be 3 5 km and 2 5 km respectively above the crystalline basement. Two prominent gravity high closures in the vicinity of Bilaspur and Akaltra are new findings and are attributed to presence of high density metamorphic schist belt below the Chhattisgarh Basin.

Keywords

Gravity Method, Graben, Schist, Gneissic Belt, Chhattisgarh Basin.

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