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Deltaic sedimentation in an unstable tectonic environment – the Lower Limestone Group (Lower Carboniferous) of East Fife, Scotland

Published online by Cambridge University Press:  01 May 2009

C. R. Fielding ,
M. Al-Rubaii  and
E. K. Walton
C. R. Fielding
Affiliation:
Department of Geology & Mineralogy, University of Queensland, St Lucia, Queensland, Australia, 4067
M. Al-Rubaii
Affiliation:
Department of Geology, University of St Andrews, St Andrews, Fife, KY16 9ST, United Kingdom
E. K. Walton
Affiliation:
Department of Geology, University of St Andrews, St Andrews, Fife, KY16 9ST, United Kingdom
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Abstract

The Lower Limestone Group, which outcrops extensively on the east coast of Fife, southeast Scotland, consists of interbedded sandstones, siltstones and claystones with occasional coal seams, and limestone beds. Several of the coals have been mined economically in the past.

The sequence was deposited in a shallow-water, deltaic setting. Three facies associations have been distinguished; (1) laminated claystones, and marine bioclastic limestones, which were deposited in prodelta and marine shelf environments, (2) crudely coarsening-upward sandstone units, interpreted as delta front deposits of fluvially-dominated though wave-influenced, shallow-water deltas, and (3) interbedded clastic sedimentary rocks and coals, deposited in delta plain environments. The sequence as a whole accumulated by repeated progradation and abandonment of deltaic complexes.

Palaeosol profiles of four types are superbly preserved within the delta plain facies association. These are (1) organic soils (peats), now coal seams, (2) gley palaeosols, which formed in persistently waterlogged conditions, (3) freely drained soils which formed on a quartz sand-rich substrate, and (4) similar profiles formed by free drainage through variable substrates and involving B horizon accumulation of concretionary iron oxides. Compound palaeosols are common.

Deposition of the Lower Limestone Group was influenced by the tectonic and volcanic instability of the Fife area during Visean times. Frequent seismic events centred on active fault lines caused local uplift of parts of the normally waterlogged delta plain environment, allowing the formation of well-drained soils. Peats (coals) were best developed and least affected by oxidation in an elongate, fault bounded zone of enhanced subsidence.

Type
Articles
Information
Geological Magazine , Volume 125 , Issue 3 , May 1988 , pp. 241 - 255
Copyright
Copyright © Cambridge University Press 1988

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