Shallow marine sedimentation in the proterozoic moine succession,northern Scotland |
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| Institution: | 1. Department of Geophysics, Federal University, Oye-Ekiti, Ekiti State, Nigeria;2. Department of Physical Sciences, Landmark University, Omu-Aran, Kwara State, Nigeria;1. Institut für Geowissenschaften, Universität Mainz, 55099 Mainz, Germany;2. School of Geography, Earth Science and Environment, The University of the South Pacific, Laucala Campus, Suva, Fiji;1. ETH, Institut für Geochemie und Petrologie, Clausiusstrasse 25, 8092 Zürich, Switzerland;2. Shell Projects and Technology, Kessler Park 1, 2288, GS, Rijswijk, Netherlands;3. Laboratoire de Géologie de Lyon, ENS Lyon, CNRS, and UCBL, Lyon, France;4. EAWAG, Department of Water Resources and Drinking Water, Dübendorf, Switzerland |
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| Abstract: | Shallow marine deposits are recognised from the Loch Eil division of the Proterozoic Moine Succession. Three sedimentary facies are identified: siltstone, interbedded siltstone and sandstone, and sandstone. The bulk of the succession comprises sandstones which are commonly cross-bedded. Bipolar cross-bedding is indicative of tidal activity, and the facies is considered to have accumulated in an offshore shallow marine setting. The interbedded siltstone and sandstone facies and the siltstone facies are similarly interpreted as offshore sediments deposited in areas characterised by relatively high rates of silt deposition and starvation of sand. Calc-silicate rocks represent concretions formed during diagenesis. Palaeocurrents derived from the lower part of the succession mainly flowed to the north-northeast with a subsidiary mode to the south-southwest, and probably represent longshore currents flowing broadly parallel to a palaeocoastline. |
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