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Resolution of regional fluid flow related to successive orogenic events on the Laurentian margin

¹ Department of Geology and Petroleum Geology, University of Aberdeen, Meston Building, Meston Walk, Aberdeen AB24-3UE, UK
² Centre for Earth, Planetary, Space, and Astronomical Research, Department of Earth Sciences, Open University, Walton Hall, Milton Keynes MK7-6AA, UK

Seven localities distributed along a 180-km-long outcrop within the UK sector of the Laurentian margin were sampled, and all showed two phases of authigenic K-feldspar. The first phase was precipitated from a cool fluid of moderate salinity, and the second phase was precipitated from a hotter, more saline fluid. Ar-Ar ages for the two episodes of authigenesis are ca. 470 Ma and ca. 432 Ma. The data can be interpreted to represent two phases of regional-scale fluid migration related to Ordovician arc accretion and Silurian continent-continent convergence, corresponding to the Grampian and Scandian episodes of the Caledonian orogeny, respectively.

Key Words: authigenic K-feldspar • fluid flow • Caledonian orogeny • Fucoid Beds

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