Tectonic and petrographic aspects of an area SW of the Lalin Unit (prov. Orense and Pontevedra, NW Spain)

In a schist area south of the Lalín Unit in the provinces of Orense and Pontevedra, a lithostratigraphy has been established. The disposition of some stratigraphic horizons shows the existence of a large-scale synformal F2-structure. Metamorphic porphyroblasts have grown mainly between the two main folding phases F1 and F2. Special attention has been given to the garnet porphyroblasts. Probably two types of garnet are present: a Hercynian garnet and an earlier garnet. There are some indications of a tectonic contact within the schists. Probably schists of Lower Palaeozoic age are overlain by older, polymetamorphic schists.