Identification of weathering and hydrothermal alteration in acidic rocks : petrography and mineralogy of clay minerals
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1983
- handle: 10670/1.be35jn
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Alain Meunier et al., « Identification of weathering and hydrothermal alteration in acidic rocks : petrography and mineralogy of clay minerals », Sciences Géologiques, bulletins et mémoires, ID : 10670/1.be35jn
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Résumé
A major problem in ore prospecting on granitic terrains is to make a distinction between clay mineral assemblages due to weathering and those due to hydrothermal alteration. The most outstanding features of these two types of transformation are : 1. Potassic beidellite is typical of hydrothermal alteration. 2. Low iron content mineral assemblages in the presence of large amounts of kao-linite is typical of hydrothermal alteration. 3. Argillan veins and pore coatings are typical of weathered rocks. The control of microprobe analyses by X-ray diffraction on small quantities of matter is very useful for the identification of clay assemblages.