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Geology; June 2007; v. 35; no. 6; p. 547-550; DOI: 10.1130/G23388A.1
© 2007 Geological Society of America
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Resolution of regional fluid flow related to successive orogenic events on the Laurentian margin

Darren F. Mark*,1, John Parnell1, Simon P. Kelley2 and Sarah C. Sherlock2

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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