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Mapping of Ultramafics and Associated Lithological Units Using Satellite Data
Result and Conclusions
Landsat TM data have been used to map the lithology associated with banded iron formations because of their characteristic spectral properties . Clay minerals such as Sericite have reflectance maxima within Landsat TM band 5 (1.55-1.75micrometer) and reflectance minima within Landsat TM band 7 (2.08to 2.35 micrometer). Hunt and Ashley, 1979).Iorn minerals such as limonite have reflectance maximum within the TM band 3 (0.63 to 0.69 micrometer) and reflectance minima within the Landsat TM band1(0.45-0.52) (Hunt et al 1971). So this TM ratio image reveals Ultramafic and its associated lithology in the Tarmar- Porapahar shear zone. This study proves that ultramafic lithology associated with sulphide-facies banded iron formations can be mapped effectively. Acknowledgement We thank our Vice-Chancellor Emeritus and Vice –Chancellor , for encouraging to take up such research work. Our Departmental Colloquies ,Research Fellows , Students for their help and support through out this study. I also like to thank the ISRO , Chairman , NRSA Director,NDC Head, NDC Staffs especially, Mr. D.Chandrasekharan, Dr. (Mrs).Aparna, Mr. Subbunagulu, Ms. P.S.Sujatha, Mrs .Malani and other Staffs for their help in procurement and initial image processing .I am also indebted to Mr. Ganesh Kumar, Mr. Krishnaiah,and Mr.Meganath ,Mr.Shastri and other staffs and friends of QC , NRSA, Hyderabad. Also I like to express my thanks to Mr. John during my stay at NRSA. I also like to express my due regards for Staffs and Scientists , IRS, Anna university, Chennai, for their valuable comments and help. References
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