Abstract
SUMMARY Isolated bodies of bedded limestone, metres in thickness, occur within dolostones of the Zechstein Raisby Formation in north-east England. Carbonate sedimentary rocks, which comprise the Raisby Formation, were deposited as pelagic and hemipelagic mudstones and wackestones on a carbonate slope during cycle 1 of the English Zechstein sequence. A characteristic of the slope environment, especially during its early evolution, was extensive submarine cementation. The intensity of early cementation at any place and time was a function of an interplay between sedimentation rate, the degree of bioturbation, and agitation of the sediment by currents. Early cementation was a significant factor in inhibiting later dolomitisation of some slope sediments by restricting the intergranular movement of dolomitising brines. Dolomitisation of Raisby Formation slope carbonates was additionally influenced by distance from the shelf area of the cycle 1 carbonate wedge, which is inferred to have been the source of dolomitising fluids, and local stratigraphic variations in porosity and permeability.
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