Geochemistry and Genesis of Manganese Ore Deposits, Andhra Pradesh, India

Geochemistry and Genesis of Manganese Ore Deposits, Andhra Pradesh, India

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
  
© 2018 by IJETT Journal
Volume-66 Number-3
Year of Publication : 2018
Authors : T.Suryanarayana
DOI :  10.14445/22315381/IJETT-V66P225

Citation 

MLA Style: T.Suryanarayana "Geochemistry and Genesis of Manganese Ore Deposits, Andhra Pradesh, India" International Journal of Engineering Trends and Technology 66.3 (2018): 170-178.

APA Style:T.Suryanarayana (2018). Geochemistry and Genesis of Manganese Ore Deposits, Andhra Pradesh, India. International Journal of Engineering Trends and Technology, 66(3), 170-178.

Abstract
Manganese deposits of Vizianagaram district, Andhra Pradesh occur as conformable bands in the Khondalite Group of rocks of Eastern Ghats complex. The dominant manganese ore minerals include cryptomelane, psilomelane, pyrolusite, hausmannite, bixbyite and wad etc., Quartz, orthoclase, garnet, kaolinite, hematite and mica are the associated gangue minerals. Presence of high silica and dominance of CaO over MgO, K?O over Na?O, Ni over CO, Zn and Cu over Pb are the elemental characteristics of the deposit. Discrete apatite grains are identified in quartz and orthoclase. Continental weathering appears to be the source for manganese and iron. After deposition and diagenesis, the manganese rich sediments were metamorphosed under granulite facies (max.700?C and min. 6 kb pressure) conditions and subsequent deformation and supergene enrichment produced the present deposit. The manganese ores are generally of low grade with high phosphorus content.

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Keywords
Manganese, Kodurite, Eastern Ghats, Phosphorous, Geochemistry, Genesis.