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

B. Nagamalleswara Rao ¹

Affiliations
1 Department of Geology, Andhra University, Visakhapatnam-530 003, IN

Abstract

Radiometric, magnetic susceptibility and mineralogical studies were carried out on the beach placer deposits in three different coastal regions of Andhra Pradesh: Hamsaladivi-Manginipudi (Region I), Vasishta Godavari-Upputeru (Region II) and Visakhapatnam-Bheemunipatnam (Region III). Radioactivity is highest in Region III and Iowestin Region I. Zircon being non-radioactive and other radioactive minerals being rare or absent; monazite is the only source of radioactivity in the three regions. Ilmenite is predominant in Region III and magnetite in Region I. Higher concentration of monazite is associated with ilmenite and not with magnetite. The Eastern Ghats provenance is the major source of ilmenite and monazite. It is suggested that pospecting for monazite and ilmenite in East Coast of India beaches is best done by a combination of radiometric and magnetic susceptibility techniques.

Keywords

Sedimentology, Beach Placer Deposits, East Coast, Andhra Pradesh.

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Ch. Venkateswara Rao ¹, B. Nagamalleswara Rao ¹, C. Kasipafhi ¹, K. Vasudev ¹, K. V. V. Saiyanarayana ², R Kaladhar ¹, G. Satyanarayana ¹, D. Markandfya Rao ¹

Affiliations
1 Department of Geology,Geophysics Andhra University, Visakhapatnam - 530 003, IN
2 Department of Geology, Geoengineering Andhra University, Visakhapatnam - 530 003, IN

Abstract

Forty eight Geoelecti ical soundings (GES) were earned out on Alluvium (Al), sandstones of Rajahmundiy (RS) ot uppei Miocene, Tnupati (TS) of Juiassic and Deccan Tiaps (DT) of Eocene ages to delineate aquifeis around Rajahmundiy, East Godavaii Distnct GES show H,K,A and K A type representing three to four layered sub suitacelitho units Based on prehminaiy pump tests and lesistivity study, the aieacun bedemaicated into thiee groundwatet zones RS having 3 to 40 m thickness with lesistivity range of 2 6 to 63 Qm giving yield of 24000-1,13100 I ph. and aieas ot TS thickness 2 4 to 11 m with lesistivity range ot 3 3 to 57 Qm with yield of above 39600-49500 lph which are consideied as good potential zones The highly weathered DT, having thickness of 5 4 to 30 m with resistivity lange ot 1 32 to 10 Q.m have modeiate yield of 34000 38400 lph Based on the geoelectrical and hydiogeological studies ot the area ten sites weie recommended foi tube/boie well dulling with expected yield of 45420 68130 lph.

Keywords

Hydtogeology, Geoelectrical sounding, Sandstone, Deccan tiap, Rajahmundry, Andhra Pradesh.

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