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Thermal inertia mapping and its application in mineral exploration: results from Mamandur polymetal prospect, India

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Title Thermal inertia mapping and its application in mineral exploration: results from Mamandur polymetal prospect, India
 
Creator RAMAKRISHNAN, D
BHARTI, R
SINGH, KD
NITHYA, M
 
Subject Image processing
Spatial analysis
Heat flow
Heat generation & transport
POSSIBLE GEOLOGICAL APPLICATIONS
ELEVATED-TEMPERATURES
EMISSION SPECTROMETER
INFRARED IMAGES
WATER-CONTENT
CONDUCTIVITY
ROCKS
SURFACE
MARS
DIFFUSIVITY
 
Description Thermal anomalies associated with ore-mineralization (Pb-Cu-Zn and Fe) were studied using thermal infrared data collected over Mamandur polymetal prospect, India, with the aid of satellite, field, and laboratory measurements. Day and night ASTER data were analysed in conjunction with field measurements to estimate thermal inertia of the ore body, altered zones and country rocks. Representative samples collected from field were also analysed for thermal conductivity, diffusivity, and inertia using a self-fabricated setup. Spatial changes in thermal inertia were mapped by look up table (LUT) and advanced thermal inertia mapping (ATIM) approaches. Mineralized zones show very high thermal contrast (delta T) both in field (15-25 degrees C) and satellite data (14.9-16.9(o)C). They also exhibit the lowest thermal inertia in field-(2118-5474 J m(-2) K-1 s(-1/2)) and satellite-based (3783-4037 J m(-2) K-1 s(-1/2)) measurements. In non-mineralized areas, acidic rocks (granite, migmatite and granite gneiss) have lower inertia than basic rocks (basic granulite, dolerite and charnockite). Results estimated by LUT and ATIM approaches correlate very well at satellite (R-2 = 0.97) and field (R-2 = 0.89) scales. Similarly, field- and satellite-based results also have good correlation (R-2 = 0.69-0.72). This study illustrates the potential of thermal inertia mapping in delineating ore bodies and deciphering the lithological changes even under veneer of soil.
 
Publisher OXFORD UNIV PRESS
 
Date 2014-10-15T12:14:08Z
2014-10-15T12:14:08Z
2013
 
Type Article
 
Identifier GEOPHYSICAL JOURNAL INTERNATIONAL, 195(1)357-368
0956-540X
1365-246X
http://dx.doi.org/10.1093/gji/ggt237
http://dspace.library.iitb.ac.in/jspui/handle/100/14877
 
Language en