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Influence des altérations de surface naturelle sur la reconnaissance des roches par télédétection V-IR : application à la cartographie de l'ophiolite d'Oman et au programme d'étude des nouvelles AOC des Muscadet de la région nantaise

Abstract : Under natural exposure conditions, rocks display a wide range of weathering modifying initial rock composition. In temperate climates, they form dip alterites, while a rock varnish develops in desert environments. Both phenomena mask the composition of the bedrock leading to a misidentification of rock types by remote sensing. For both Nantes Muscadet and Oman ophiolite, the weathering study necessitates comparisons between fresh and weathered surface V-NIR spectra. A new standardisation of spectra is introduced to remove roughness effect specific to each scale of observation (laboratory, field, airborne). A mineralogical study of sols by spectrometry and XRD, allows to define limit of detection between rocks of the Nappe de Champtoceaux and rock types of the Pallet gabbro. These results are tested with an airborne campaign simulation. The Sumail Massif (Oman) mapping is achieved by studying different facies spectra, validated by petrological and SEM analysis. The mantle and the crustal section of the ophiolite are dissociated from the HyMap image. The calculation of synthetic mixtures from field spectra led to quantify the surface coverage of each lithology. The combination of these maps succeeds to a new geological map. In the crustal section, it reveals the presence of a new bloc with anomalous contain in orthopyroxene.
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https://tel.archives-ouvertes.fr/tel-00647382
Contributor : Régis Roy <>
Submitted on : Thursday, December 1, 2011 - 10:28:32 PM
Last modification on : Tuesday, October 6, 2020 - 11:40:05 AM
Long-term archiving on: : Monday, December 5, 2016 - 6:13:29 AM

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  • HAL Id : tel-00647382, version 1

Citation

Régis Roy. Influence des altérations de surface naturelle sur la reconnaissance des roches par télédétection V-IR : application à la cartographie de l'ophiolite d'Oman et au programme d'étude des nouvelles AOC des Muscadet de la région nantaise. Sciences de la Terre. Université de Nantes, 2007. Français. ⟨tel-00647382⟩

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