Basinal and Structural Appraisal of Magnetic Data of Chattisgarh Region, Central India

The Chattisgarh Basin ot the Ccntial Indian Piecambnan Shield is one of the Puiana basins of Meso to Neopioteiozoic age which has not been geophysically investigated in good detail so far Under the Deep Continental Studies Pioject, two regional magnetic piofiies over a stietch of 382 and 403 km acioss the Chattisgaih legion weie can led out fot the fust time in ncai east west and noith south dnections respectively

The Chattisgaih Basin lecoided a bioad magnetic high compared to Sakoh Belt and Dongargaih Supergioup in the west and Sonakhan Greenstone Belt in the east which were reflected as lows on either side of the basin Two dimensional modelling of the data reveals a maximum thickness ot 3000 m toi the Chattisgaih sediments The acidic and basic volcanic locks associated with Sakohs Dongargarh, Sonakhan Greenstone belt and Kondagaon Granuhte belt weie demaicated and their geometiy decipheied The Indravati sediments along north south piofile indicate a maximum thickness of 2500 m Besides this, modelling of magnetic data also leveals the presence of possible inti usives into the Chattisgaih and Indravati sediments / basement

Based on the model lesults and available geological information an attempt is made to study the natuie of the uppei ciust beneath die Chattisgarh basin It appeals that the detritus to the basin sediments is derived fiom the basic locks in the centie, aiound Raipur while the peripheries are of gtanitic / acidic natuie indicating a ring type stiuctuie.