Mohanty, Debadutta (2011) Landsat ETM + Image Analysis for Alteration Mapping in Sukinda Chromite Deposit, Orissa: Case of a Vegetated Mineralized Region. International Journal of Earth Sciences and Engineering , 4 (3). pp. 30-38. ISSN 0974-5904

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Abstract

In this paper we examine the potential of a freely available Landsat ETM+ dataset of the Sukinda Chromite deposit in Orissa, India. The deposit is hosted in the layered ultramafics (dunite and peridotite rocks) and is co-folded with iron ore group (IOG) quartzites, capped with volcanic tuffaceous rocks at places. The Sukinda valley is covered by thick veneer of latertized and /or limonitized ultramafics. Given these geologic characteristics, the ETM+ data has been processed to enhance spectral features related to anomolous concentrations of ferric oxides and ferrous oxides and hydroxides, alteration minerals with rich hydroxyl components, such as clays and laterites. Due to extensive and thick vegetation cover, the simple methods of band ratios are unable to provide a very clear picture of the alteration anomalies; however, a modified form of the Principal Components Analysis, popularly called the Crosta technique is able to provide a more unambiguous discrimination related to the mineralogic spectral differences among outcrop lithologies and soil cover.

Item Type:	Article
Uncontrolled Keywords:	Vegetation, alteration, Mineralized, Crosta technique
Subjects:	Resource Quality Assessment and Coal Petrology
Divisions:	UNSPECIFIED
Depositing User:	Dr. Satyendra Kumar Singh
Date Deposited:	26 Dec 2011 06:41
Last Modified:	26 Dec 2011 06:41
URI:	http://cimfr.csircentral.net/id/eprint/491

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