Spectral reflectance characteristics of the Hamar Laghdad hydrothermal sequence, Morocco

Implications for the methane origin on Mars

Maria Sgavetti, Giovanna Serventi, Giuditta Tampella, Giuseppe Pedrazzi, Cristian Carli, Loredana Pompilio, Fulvio Franchi, Claudio Tellini

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    We analyze and discuss reflectance spectra of carbonate rocks from the Hamar Laghdad area (Morocco), where evidences of interactions with hydrothermal, and, in some cases, methane enriched fluids derived from underlying volcanoclastic rocks, are reported in the literature. Deconvolution of the rock spectra into a sum of Gaussians, using MGM, resolved a number of both vibrational and electronic absorption features, mainly assigned to CO3 2-, Al-OH, and Fe2+, Fe3+, Cu, CF interaction processes, respectively. The associations of these absorption bands are exhaustive descriptions of the rock spectral properties. A spectral model of the Hamar Laghdad carbonate sequence was therefore delineated, based on the integration of these absorption band associations with XRF and Mössbauer analyses of the rock samples. The model involves: pure limestones and dolostones, limestone with iron carbonates, mixed carbonate and Al-silicate impure limestones, limestones with iron sulfides. The model points out the complexity of the spectral characteristics of rocks that underwent hydrothermal and partly methanogenic processes, but also suggests an alternative geologic scenario plausible for possible methanogenic activity in the Mars geologic past.

    Original languageEnglish
    Pages (from-to)184-197
    Number of pages14
    JournalIcarus
    Volume245
    DOIs
    Publication statusPublished - Jan 1 2015

    Fingerprint

    Morocco
    spectral reflectance
    mars
    Mars
    methane
    limestone
    rocks
    carbonates
    rock
    carbonate
    dolostone
    iron sulfide
    absorption spectra
    iron
    deconvolution
    X-ray fluorescence
    carbonate rock
    reflectance
    silicate
    sulfides

    All Science Journal Classification (ASJC) codes

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Sgavetti, M., Serventi, G., Tampella, G., Pedrazzi, G., Carli, C., Pompilio, L., ... Tellini, C. (2015). Spectral reflectance characteristics of the Hamar Laghdad hydrothermal sequence, Morocco: Implications for the methane origin on Mars. Icarus, 245, 184-197. https://doi.org/10.1016/j.icarus.2014.09.027
    Sgavetti, Maria ; Serventi, Giovanna ; Tampella, Giuditta ; Pedrazzi, Giuseppe ; Carli, Cristian ; Pompilio, Loredana ; Franchi, Fulvio ; Tellini, Claudio. / Spectral reflectance characteristics of the Hamar Laghdad hydrothermal sequence, Morocco : Implications for the methane origin on Mars. In: Icarus. 2015 ; Vol. 245. pp. 184-197.
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    Spectral reflectance characteristics of the Hamar Laghdad hydrothermal sequence, Morocco : Implications for the methane origin on Mars. / Sgavetti, Maria; Serventi, Giovanna; Tampella, Giuditta; Pedrazzi, Giuseppe; Carli, Cristian; Pompilio, Loredana; Franchi, Fulvio; Tellini, Claudio.

    In: Icarus, Vol. 245, 01.01.2015, p. 184-197.

    Research output: Contribution to journalArticle

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    AU - Tellini, Claudio

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