Calcretic and ferricretic duricrusts of the Thar Desert, India: their geotechnical appraisal as a road paving aggregate

Ramakrishnan, D.; Tiwari, K. C.

doi:10.1016/s0013-7952(98)00075-1

Cited by 6 publications

(1 citation statement)

References 11 publications

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“…Regardless of atmospheric water vapor noises, hyperion data and lab measured reflectance spectra have great potential in calcrete (with high and low Mg content) exploration. The spectroscopy and geochemical analyses give acceptable results which is comparable with published data [8]. In-situ Gammaray spectrometry and geochemical analyses confirm the presence of secondary Uranium mineralization in the study area.…”

Section: Resultssupporting

confidence: 86%

Uraniferous calcrete mapping using hyperspectral remote sensing

Bharti

Ramakrishnan

2014

2014 IEEE Geoscience and Remote Sensing Symposium

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Calcrete, the calcium carbonate duricrust generally occurs in arid/ semiarid region. Globally, it has been used as a non-traditional constructional material. The recent discovery of calcrete hosted secondary uranium deposits in Australia and Namibia has kindled interest in exploration of calcretes in many parts of the world. In this study, palaeochannel related calcretes of the Thar desert, India is explored as a possible source for uranium mineralization. The adopted exploration strategy includes mapping of calcretes using hyperspectral satellite data, in-situ radiometric survey, analyses of field collected samples for mineralogy and geochemistry. Calcretes along palaeochannels were mapped using Hyperion data, field spectra and Spectral Angle Mapper (SAM) technique. It was found that the adopted technique could also differentiate high-, and low-Mg calcretes with 72% accuracy. Mineralogy of calcrete includes calcite (40-60%), quartz (30-45%) and feldspar (10-15%) with minor amount of clay minerals (montmorillonite, kaolinite, illite, goethite). In in-situ radiometric survey, the range of uranium, thorium and potassium in the calcretes varies from 2.4-11ppm, 5-28.2ppm, and 0.8-4.2% respectively.

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Section: Resultssupporting

confidence: 86%