@article{f631ea6186964772982f194b92af5a0c,
title = "New evidence of Nontronite as Rhyodacite alteration product, Nefza area, Northern Tunisia",
abstract = "The magmatic rocks of the Nefza district located in the NW part of Tunisia belong to a Neogene volcanic complex. It includes fresh rhyodacites weathered into kaolinite and/or halloysite, and nontronite. Chemical analyses of rhyodacites compared to the nontronite phase reveal an evolution in the composition in term of loss in Na, Ca, K. The values of CIW (Chemical Index of Weathering) and the AI index (Alteration Index of Ishikawa) show that the rhyodacite experienced chemical changes due to the leaching of the fresh rocks by meteoric and hydrothermal waters.",
keywords = "Tunisia, kaolinite, Nontronite, weathering indexes, rhyodacite, Nefza",
author = "{Ben Abdallah}, Randa and M. Medhioub and B{\'e}chir Moussi and Johan Yans and N. HATIRA and H.-R. Chaftar and W. Hajjaji and Baele, {Jean Marc} and Fakher Jamoussi",
year = "2014",
month = may,
language = "English",
volume = "122",
pages = "178--194",
journal = "European Journal of Scientific Research",
issn = "1450-216X",
publisher = "European Journals Inc.",
number = "2",
}