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Geological Society, London, Special Publications

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Ancient duricrusts and related rocks in perspective: a contribution from the Old Red Sandstone

John Parnell
Geological Society, London, Special Publications, 11, 197-209, 1 January 1983, https://doi.org/10.1144/GSL.SP.1983.011.01.20
John Parnell
Department of Geology, Imperial College London SW7 2BP
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Summary

Calcretes are abundant in continental Devonian (Old Red Sandstone) rocks, occurring both within the sequence and at the basal unconformity. Basal limestones in the Orcadian Basin also include algal deposits and fissure linings, all of which can be considered as a single phase of carbonate precipitation and growth. A prominent silcrete in Orkney replaces both rudites and chert-bearing lacustrine laminites. Silcrete and calcrete are examined in a wider context of chemical sedimentation in lacustrine rocks. The effects of weathering processes in these rocks may be combined or confused with those of algal processes. A silicified plant-bearing sequence at Rhynie displays the same diagenetic features as the Orkney silcrete. Limited metalliferous and bituminous enrichments are recorded in the largest ORS duricrusts. A basal sequence at Dalroy exemplifies the possible confusion between weathering concentrations and mineral deposits trapped at an unconformity surface. Barite is a common component of some duricrusts. Duricrust formation is part of a range of sedimentary replacement and cementation phenomena which may be difficult to distinguish in ancient rocks.

  • © 1983 The Geological Society

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Geological Society, London, Special Publications: 11 (1)
Geological Society, London, Special Publications
Volume 11
1983
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Ancient duricrusts and related rocks in perspective: a contribution from the Old Red Sandstone

John Parnell
Geological Society, London, Special Publications, 11, 197-209, 1 January 1983, https://doi.org/10.1144/GSL.SP.1983.011.01.20
John Parnell
Department of Geology, Imperial College London SW7 2BP
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Ancient duricrusts and related rocks in perspective: a contribution from the Old Red Sandstone

John Parnell
Geological Society, London, Special Publications, 11, 197-209, 1 January 1983, https://doi.org/10.1144/GSL.SP.1983.011.01.20
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