Petrogenesis of the phonolitic rocks of the Velay oriental, France
The Velay oriental (Massif Central, France) is a basaltic plateau with abundant viscous phonolite extrusions. The plateau lavas grade from alkali basalt to mugearite, but intermediate compositions are volumetrically scarce. Pyroclastics are absent. The most complete plateau sections are in the south, while in the north intermediate lavas appear only as viscous, phenocryst-rich extrusions.
The plateau lavas were erupted between 11.7Ma and 7.6Ma, the southern phonolites 8.5Ma- 6.5Ma an...Expand abstract
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- University of Oxford
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- Hodges, S
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