The crystalline schists of northern Limousin, France, are polymetamorphic in origin. Two phases of migmatization have been distinguished, of different chemical nature and separated by a long time interval. This double metamorphism is not limited to northern Limousin, but is a general characteristic of other parts of the Central Massif and of the metamorphic terrain of Brittany. The classic scheme of metamorphic zoning of migmatites does not hold; rather than an advancing front of migmatization two distinct processes took place at different times--granitization, consisting essentially of partial or total remobilization of preexisting materials, and regional feldspathization, involving K-metasomatism, both represented by independent facies.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not currently have access to this article.