Hyperspectral study of hydrous sulphate minerals from Deccan Volcanic Province of Kutch, India: Implications for aqueous processes on Mars

Details Hyperspectral study of hydrous sulphate minerals from Deccan Volcanic Province of Kutch, India: Implications for aqueous processes on Mars Hyperspectral study of hydrous sulphate minerals from Deccan Volcanic Province of Kutch, India: Implications for aqueous processes on Mars

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1861j&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1861

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Scientific paper

Here we present the reflectance spectra of Jarosite from the Deccan Volcanic Province (DVP) of Kutch, Gujarat (India). Jarosite (hydrous sulphate) (KFe33(OH)6(SO4)2) occurs as lenticular bodies within the Paleocene sandstone belonging to the DVP of Kutch region. Jarosite is formed through the oxidation of iron sulphides under extreme conditions of low pH and high Eh. These sulphate layers are white to yellow in colour and are up to 1 m thick, and extend laterally for over a kilometre on both sides of Matanumadh area on Lakhpat road. Jarosite is also reported from different parts of Mars. Jarosite bearing sandstone unit belonging to DVP at Matanumadh can therefore be considered as a terrestrial analogue to Mars. Here we present the reflectance spectra of hydrous sulphates that have been collected from the study area using FieldSpec3 spectrometer (0.3μm - 2.5μm). Study of the reflectance spectra of hydrous sulphates and Jarosite in particular clearly indicates the presence of OH and H2O in the crystal lattice of the alteration products. Reflectance spectroscopy of Jarosite and other hydrous sulphates will help in identifying optimum bands for identification of these minerals in remotely sensed data of Earth as well as on the Mars. Moreover, study of Jarosite from DVP of Kutch will help in understanding the fluid-rock interaction and aqueous alteration processes associated with volcanic activities on the Mars.

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