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Article: New isotopic age determinations for the Torridonian, NW Scotland

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Journal of the Geological Society
Article date:
November 1, 1996
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MATTHEW J. M. TURNBULL, MARTIN J. WHITEHOUSE ' & STEPHEN MOORBATH

Abstract: Isotopic data are used to determine a new chronology for the Torridonian of NW Scotland. The calcite fraction of the Stoer Group Limestone Member yields a Pb-Pb age of 1199+/- 70 (2sigma) Ma (MSWD = 1.1). Rb-Sr whole-rock regressions from siltstones of the Diabaig and Applecross Formations (both Torridon Group) produce ages of 994+/- 48 (2sigma) Ma (MSWD = 17) and 977+/- 39 (2sigma) Ma (MSWD =10) respectively. These dates, which agree well with palaeomagnetic estimates, are interpreted as the time of early diagenesis which is probably within error of the time of deposition. Previous isotopic age determinations ...

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