Abstract

U-Pb dating has been carried out on single zircon and titanite grains in greywacke intercalated with lavas of the late Ordovician (443 ±3 Ma) Solund-Stavfjord ophiolite. The ages range from 2495 Ma to 462 Ma indicating that detritus was provided by a Precambrian continental region as well as an Ordovician Caledonian terrane. The Caledonian component of the detritus was probably derived from the early Ordovician ophiolitic terrane of west Norway, and the data therefore link two generations of Caledonian ophiolites. The mapped relationships of the ophiolitic terranes suggest that the late Ordovician–early Silurian evolution of the Caledonides was dominated by rifting and the formation of marginal basin(s).

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