Airborne gamma-ray spectrometry to quantify chemical erosion processes - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Journal of Geochemical Exploration Année : 2006

Airborne gamma-ray spectrometry to quantify chemical erosion processes

Résumé

Airborne gamma-ray spectrometry data (uranium, potassium and thorium contents) reveal geochemical heterogeneities within the monolithological Hyrôme watershed (ca. 150 km2) in the Armorican massif (western France). Our observations and computations provide important constraints on the spatial distribution and the associated magnitudes of chemical erosion processes at the scale of a small watershed. Two distinct, partially preserved, weathering profiles exhibit a strong correlation between regolith evolution and airborne-derived K/Th ratios, suggesting that the variability is linked to supergene processes. Using both airborne data and laboratory measurements on rock samples, the total net export of potassium has been estimated at 422 ± 50 kg/m2 and the chemical weathering rate of potassium at 17 ± 2 kg/km2/a.

Dates et versions

hal-00148750 , version 1 (23-05-2007)

Identifiants

Citer

Frédéric Carrier, Bernard Bourdon, É. Pili, Catherine Truffert, Robert Wyns. Airborne gamma-ray spectrometry to quantify chemical erosion processes. Journal of Geochemical Exploration, 2006, 239 (1-2), pp.45-62. ⟨10.1016/j.gexplo.2005.08.053⟩. ⟨hal-00148750⟩
131 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More