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Detection of Mg spinel lithologies on central peak of crater Theophilus using Moon Mineralogy Mapper (M3) data from Chandrayaan-1
- LAL, D, CHAUHAN, P, SHAH, R D, BHATTACHARYA, S, AJAI,, KIRAN KUMAR, A S
- Journal of earth system science 2012 v.121 no.3 pp. 847-853
- Earth system science, absorption, iron, models, magnesium, minerals, reflectance, India
- Spectral reflectance data derived from Moon Mineralogy Mapper (M3) onboard Indiaâs Chandrayaan-1 has revealed Fe bearing Mg-spinel-rich lithology on central peaks of the crater Theophilus. These newly identified Fe bearing Mg-spinel-rich rock types are defined by their strong 2-Î¼m absorption and lack of 1-Î¼m absorptions in spectral reflectance response. Such lithology has been reported previously along the inner ring of Moscoviense Basin on the lunar far side. The Modified Gaussian Modeling (MGM) analysis of the Fe bearing Mg-spinel reflectance spectra has been done and the results of the analysis clearly bring out a strong spectral absorption at 1872Â nm with no significant absortion around 1000Â nm. The presence of spinel group of minerals in the Theophilus central peak and the fact that central peaks mostly represent uplifted mass of deep crustal material confirm that central peaks can be used as a window to study the deep crustal and/or upper mantle composition and may lead to a fresh perspective about the crustal composition of Moon.