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63 for insightful reviews of the manuscript. This paper is a contribution to IGCP Project 497, “ The Rheic Ocean: Origin, evolution and correlatives ” . References Abati, J., Dunning, G.R., Arenas, R., Díaz García, F., González Cuadra, P., Martínez Catalán, J.R., Andonaegui, P., 1999. Early Ordovician orogenic event in Galicia (NW Spain): evidences from U – Pb ages in the uppermost unit of the Órdenes Complex. Earth and Planetary Science Letters 165, 213 – 228. Abati, J., Arenas, R., Martínez Catalán, J.R., Díaz García, F., 2003. Anticlockwise P – T path of granulites from the Monte Castelo Gabbro (Órdenes Complex, NW Spain). Journal of Petrology 44, 305 – 327. Abati, J., Castiñeiras, P., Arenas, R., Fernández-Suárez, J., Gómez-Barreiro, J., Wooden, J., 2007. Using SHRIMP zircon dating to unravel tectonothermal events in arc environments. The early Palaeozoic arc of NW Iberia revisited. Terra Nova 19, 432 – 439. 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