inscription
Portail d'information géographique

Résultats de la recherche (6 résultats)

Affinez votre recherche

Par Collection Par Auteur Par Date Par Sujet Par Titre
  • An experimental approach to the sequence of the stability of rock-forming minerals towards chemical weathering
  • The aim of this study was to obtain the dissolution rates of common rock-forming minerals in pure and slighly acid aerated water without use of buffers. The use of low pH values appears justified since acid rain as well as biogenic weathering due
  • Climatic and morphological control of rare earth element distribution in weathering mantles on alkaline rocks
  • The aim of this study is to determine the behavior of REE, U and Th during the weathering of a crystalline rock with common REE-U-Th contents. The Akongo lateritic profile which developed on a syenite has been chosen because 1) this profile
  • is representative of the main lateritic profiles found in tropical environments, 2) the possibility to calculate mass balance in the crystalline parent rock and 3) the contrasted behavior of elements during lateritic weathering.
  • The weathering of basaltic rocks in Burundi and Vietnam
  • Geochemistry ; K/Ar dating ; Laterite ; Mineralogy ; Nigeria ; Palaeo-environment ; Sedimentary ; Stratigraphy ; Volcanic rock ; Weathering
  • At Posse, primary gold mineralization occurs near the base of a sequence of metamorphosed volcanic and volcaniclastic rocks. During the Velhas geomorphological cycle (Oligocene to Lower Pleistocene) the region experienced extensive lateritization