6533b82efe1ef96bd1293153

RESEARCH PRODUCT

Zur Genese der Migmatite des Beaume-Tales (Mittlere C�vennen, D�p. Ard�che)

H. J. Tobschall

subject

GeophysicsGeochemistry and PetrologyMetamorphic rockAnalytical chemistryMineralogyMigmatiteGeologyGneiss

description

Samples of micaschists, gneisses, and migmatites from a sequence of metamorphic subfacies of the Gevennes Medianes (Dep. Ardeche, France) are characterized chemically by a) a high and only slightly varying Al2O3 content (m.v.=17.57 wt.-%, stand, dev.=1.804, var. coeff.=0.103). b) a negligible variation of the molar MgO/MgO+FeO ratio (m.v.=0.504, stand. dev.= 0.066, var. coeff.=0.130), and c) an insignificant variation of the molar CaO/CaO + Na2O ratio (m.v.=0.360, stand. dev.=0.014, var. coeff.=0.039).

https://doi.org/10.1007/bf00383053