Lago San José, M.Gil-Imaz, A.Arranz Yagüe, E.Bastida, J.Pocoví Juan, Andrés2010-01-222010-01-221995Cadernos do Laboratorio Xeolóxico de Laxe, 1995, 20: 195-212 ISSN: 0213-44970213-4497http://hdl.handle.net/2183/6189[Abstract] The volcanoclastic outcrop ofOrea (south margin of the Iberian Chain) reflects a pluriepisodic igneous activity, expressed in agglomerates and tuffs ofdacitic composition (with a calc-alkaline affinity) and Autunian-Thuringian age. The tuffs are the results' of a hydromagmatic activity, developed under a thin sheet of water (in a paludal environment). The structure of the magmatic outcrop results of the late-Hercynian extensional tectonics, equivalent to that observed in many other outcrops ofthe southeast border ofthe Iberian Chain. The setting characters and composition of the involved magmatic rock-types, suggest the presence of only one volcanic focus, as in other coetaneous half-grabens of this sector of the Iberian Chain.spajournal articleopen access