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• W828239413 abstract "AbstractIn this study the Cleveland Ironstone and Whitby Mudstone Formations have beeninvestigated to characterise: a) the evolving mudstone facies present in a basin that isgradually deepening and developing bottom water anoxia over time and b) what thefundamental geological controls were on this variability.Using detailed facies descriptions obtained from analyses of approximately 151 samplesobtained from combined optical, electron optical and geochemical methods 6 lithofacieshave been identified. These include: 1) sand and clay-bearing, silt-rich mudstones, 2) siltbearing,clay-rich mudstones, 3) clay-rich mudstones, 4) clay, calcareous nannoplankton-,and organic carbon-bearing mudstones, 5) fine-grained muddy sandstones, and 6) cementrichmudstones. Individually, the samples are highly heterogeneous and typically organisedinto thin beds (<10 mm thick). These beds contain varying proportions of materials derivedfrom inputs to the basin, primary production within the basin and the effects of diagenesis.In addition, they are microtexturally diverse and preserve primary depositional texturessuch as: sharp bases, normal graded bedding, starved ripple laminae, triplet fabrics,tempestites, pelleted laminae as well as a variety of burrowing fabrics.With these data three main questions were addressed (each of these questions forms thebasis of a paper). These include (1) Identifying the main processes responsible forsediment dispersal in this succession, (2) Discussing the mechanisms of organic carbonpreservation when bottom water anoxia was not as prevalent as most authors have assumedand (3) Determining if this succession can be interpreted within a sequence stratigraphicframework.The presence of ripples and triplet fabrics throughout this succession indicate that muddepositionin this succession was much more dynamic than most researchers had assumed.Moreover there was not that much difference between the processes operating to deliverand disperse sediment in the coarser parts of the succession compared with those operatingin the finer grained, more production parts of the succession. The large volumes of organiccarbon preserved here indicate that the role of bottom water anoxia as a pre-requisite forenhanced organic carbon preservation in sediments has been overstated. Moreover, thepresence of marine snow suggests that much of the organic carbon was deliveredepisodically to the sea floor following phytoplankton blooms. Finally, as a significantfraction of the sediment is being dispersed by advective processes operating to infillavailable accommodation the building of sequences can be recognised (namely beds,parasequences, and systems tracts at stratal surfaces) this type of succession is reasonablyinterpreted using sequence stratigraphic principles.This study demonstrates that it is possible to directly link up-dip lithofacies variability inproximal sandy-mudstone deposits with coeval variations down-dip in distal basinaldeposits. There is no reason why the processes occurring in basinal settings should bedisconnected from those occurring up-dip in the lower shore face and offshore transitionenvironments as their deposition represents a continuum of processes." @default.
• W828239413 created "2016-06-24" @default.
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• W828239413 date "2011-08-09" @default.
• W828239413 modified "2023-09-28" @default.
• W828239413 title "An investigation of the sediment dispersal operating to control lithofacies variability and organic carbon preservation in an ancient mud-dominated succession: a case study of the Lower Jurassic mudstone dominated succession exposed in the Cleveland Basin (North Yorkshire)" @default.
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