Bhima Basin Analysis.pptx

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1. BHIMA BASIN SESSION – 2020-2021 SUBJECT – STRATIGRAPHY PRESENTED BY- GOPAL JI GUPTA (190014215018) MANEESH KUMAR (190014215030) M.SC. 3 rd SEM

2. introduction It is exposed in an area of just over 5000 sq. km. In parts of northern Karnataka and consist of mainly limestones and shales with thin arenites and conglomerate at the base. Unmetamorphosed and undisturbed sediments , resting upon the Archaean crystallines and capped by the Deccan Traps in this region.

3. CONTINUE..... It is one of the smallest of the independently recognised “ purana basins of peninsular india ”. Minerlisation has taken place in faulted areas of the basin like Kurlagere-Gogi fault.

4. Geological age U– Th – Pb and Rb–Sr (strontium) radiometric dates of limestones and glauconite ‐bearing sandstones of the Bhima Group ( Bhima Basin). Indicate deposition at around 800–900 Ma. That means it belongs to the neoproterozoic Era of Proterozoic Eon.

5. Tectonic condition The age of the Bhima Basin has the time period of Pannotia /Pan-Africa supercontinent. The sigmoidal nature of the Bhima Basin contact is significant and is attributed to the pull apart mechanism. The isostatic adjustment of the area leads to the faulting during pre-, syn -, post- sedimentry periods.

6. CONTINUE...... The fracturing and development of foliation charcteristically seen in granites point out involvement of reactivation processes which leads to the ore grade uranium deposits along the fault zones such as Gogi and other places,

7. LITHOSTRATIGRAPHY FORMATION MAXIMUM THICKNESS MEMBER MAIN LITHOLOGICAL COMPONENT Shahabad limestone <75m. Gray , argelliceous micritic lst . Dark bluish gray, massive limestone Variegted , siliceous and cherry lst Blue grey, blocky miritic lst Flaggy limestone Rabanpalli Clastics <70m. Ekmai shale member Ferrogenous shales, with calcareous shales at top Kasturplli Green, glauconitic bearing fine sst and siltstone Kundrapalli Quartz arenite member Quartzitic sst (medium to fine grained) Adki Hill conlomerate member Polymictic conglomerates and arkosic , grity sst

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9. mineralization There is association of Uraniam with Phosphatic limestone at Ukinal along fault zone. Hematite, coffinite and pichblend are low temp. Minerals suggest the temperature of formation of Ur is low. The Shahabad limestone used in the cement industry.

10. PALEOGEOGRAPHICAL MAP

11. CORRELATIONS OF PURANA BASINS OF DHARWAR CRATON Cuddapah-Kurnool Pranhita-Godawari Kaladgi-Badami Bhima Kurnool Gp. Kundair Sgp. Jammalamadugu Sgp. Sullavai/Usur Gp. Penganga Gp. Badami Gp. Andola Sgp. Sedam Sgp. Cuddapah Sgp. Srisailam Quartzite Nallamalai Gp. Chitravati Gp. Papaghni Gp. Albaka/Pamanuru Sst. Mulug/Venkatapuram Mallampalli Gp. Simikeri Sgp. Lokapur Sgp. Gp . – Group, Sgp. - Supergroup , Sst - Sandstone

12. REFERENCE Kale & Mudholkar , 1990, Stratigraphy of the Bhima Group K.K. Dwivedy , K.K. Achar , S.A.Pandit , V.Natrajan , M.K. Kumar, BHIMA BASIN, KARNATAKA, INDIA URANIUM MINERALISATION IN THE NEOPROTEROZOIC Geology of India, vol. 1, M Ramakrishnan & R Vaidyanadhan

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