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

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A Modified Sequential Extraction Technique and its Usefulness in Geochemical Exploration


Affiliations
1 Chemical Division, Geological Survey of India, 4-3-542, Bogulkunta, Hyderabad 500001, India
2 Division of Regional Integrated Survey, Geological Survey of India, 4-3-542, Bogulkunta, Hyderabad 500001, India
     

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Sequential extraction techniques for determination of trace metals associated with different phases in soils/stream sediments are being increasingly used for geochemical exploration in recent years. The existing techniques do not provide for the separate determination of Copper, Lead or Zinc present in the secondary mineral form, although in many soils and stream sediments, these metals exist in such phases. Based on laboratory studies, the sequential extraction technique suggested by Chao and Theobald (Jr) has been modified to include an additional step to provide for determination of Copper, Lead and Zinc present in their commonly occurring secondary mineral forms. Making use of the modified scheme, stream sediment samples from Ahobilam area in Cuddapah Proterozoic basin have been analysed. Metal contents of samples in the primary and secondary mineral phases were found to be good indicators for Pb and Zn mineralization in zones 2 and 3. Subsequent field check revealed Ph-Zn mineralization in t he above two zones.
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  • A Modified Sequential Extraction Technique and its Usefulness in Geochemical Exploration

Abstract Views: 178  |  PDF Views: 5

Authors

A. Purushottam
Chemical Division, Geological Survey of India, 4-3-542, Bogulkunta, Hyderabad 500001, India
B. V. S. R. Murty
Chemical Division, Geological Survey of India, 4-3-542, Bogulkunta, Hyderabad 500001, India
S. Chandra
Chemical Division, Geological Survey of India, 4-3-542, Bogulkunta, Hyderabad 500001, India
N. Subba Rao
Division of Regional Integrated Survey, Geological Survey of India, 4-3-542, Bogulkunta, Hyderabad 500001, India
A. Syamala Rao
Division of Regional Integrated Survey, Geological Survey of India, 4-3-542, Bogulkunta, Hyderabad 500001, India
P. C. Basu
Division of Regional Integrated Survey, Geological Survey of India, 4-3-542, Bogulkunta, Hyderabad 500001, India
N. K. Sood
Division of Regional Integrated Survey, Geological Survey of India, 4-3-542, Bogulkunta, Hyderabad 500001, India

Abstract


Sequential extraction techniques for determination of trace metals associated with different phases in soils/stream sediments are being increasingly used for geochemical exploration in recent years. The existing techniques do not provide for the separate determination of Copper, Lead or Zinc present in the secondary mineral form, although in many soils and stream sediments, these metals exist in such phases. Based on laboratory studies, the sequential extraction technique suggested by Chao and Theobald (Jr) has been modified to include an additional step to provide for determination of Copper, Lead and Zinc present in their commonly occurring secondary mineral forms. Making use of the modified scheme, stream sediment samples from Ahobilam area in Cuddapah Proterozoic basin have been analysed. Metal contents of samples in the primary and secondary mineral phases were found to be good indicators for Pb and Zn mineralization in zones 2 and 3. Subsequent field check revealed Ph-Zn mineralization in t he above two zones.