Nature et origine des „andésites“ et „trachyandésites“ cénozoiques du Massif Central Français

✍ Scribed by M. Girod; C. Lefèvre

• Book ID: 104776851
• Publisher: Springer
• Year: 1972
• Tongue: English
• Weight: 893 KB
• Volume: 36
• Category: Article
• ISSN: 0010-7999
• DOI: 10.1007/bf00444338

✦ Synopsis

The intermediate lavas ("andesites, trachyandesites, doreites, sancyites") of the Cenozoic volcanic districts of the Massif Central (France) are compared with lavas of the alkaline and calc-alkaline suites. On ground of mineralogical and chemical data, two groups may be recognized. The rocks of the first group bear a close resemblance with the intermediate rocks that result of the differentiation of an alkaline basaltic magma. The rocks of the second group, less numerous, possess one or several characters identical to those of calc-alkaline an@sites.

The contamination suffered by some lavas of both groups has not been sufficient to blot out their comagmatic characteristics.