“…It cautions against developing basin-scale models from a few well exposed and heavily researched outcrop successions, and emphasises the value of multidisciplinary studies for revealing the underlying depositional controls that shape the geometry and complexity of mudstone heterogeneity. Wilhelm, C. (2014) Boreholes are continuously cored successions drilled for BGS, or partially cored successions drilled by others for hydrocarbons exploration (Ashdown 2, Kimmeridge 2) and held in the BGS national borehole archive at Keyworth, Nottingham. Biozonal nomenclature used in the text follows the conventions discussed by Cox (1990), in regarding Jurassic ammonite zones as chronostratigraphical units, referred to by species name with an initial capital letter written in non-italicized text.…”
Section: Discussionmentioning
confidence: 99%
“…Deposition of the Oxford Clay Formation (Callovian/Oxfordian) coincided with a period of marked crustal extension and fracturing associated with North Atlantic rifting (Wilhelm 2014). Mid Jurassic (Late Toarcian -Bathonian) thermal doming of the North Sea region began to subside in the Early Callovian (Underhill 1998), although the dome flanks persisted as a positive structural entity (Bradshaw et al 1992).…”
Facies variability of mudstones is likely greater than generally perceived, with important implications for their behaviour in major civil engineering, energy and waste disposal applications. Here, we explore this variability for the UK Oxford Clay, a widely studied Middle/Upper Jurassic mudstone. Evidence from wire-line logs, geochemistry, sequence stratigraphy and biofacies analyses are combined to reveal heterogeneity within the Peterborough Member (Lower Oxford Clay) and to explore the extent to which it blanketed basin features or responded dynamically to them. Thickness modelling suggests that the Mid North Sea High, formed by Mid Jurassic thermal doming, likely influenced sediment pathways, favouring thick sediment accumulation in the Wessex Basin, thinner successions across the East Midlands Shelf, and sediment starvation in the Weald Basin. Biofacies patterns, determined using a novel combination of detrended correspondence and cluster analysis, vary significantly and suggest a complex patchwork of environments related to local basin setting. The Type Section of the Peterborough Member seems to represent only a narrow range of conditions that influenced its deposition, and cautions against developing basin-scale models based on a few well exposed and heavily researched outcrop successions.
“…It cautions against developing basin-scale models from a few well exposed and heavily researched outcrop successions, and emphasises the value of multidisciplinary studies for revealing the underlying depositional controls that shape the geometry and complexity of mudstone heterogeneity. Wilhelm, C. (2014) Boreholes are continuously cored successions drilled for BGS, or partially cored successions drilled by others for hydrocarbons exploration (Ashdown 2, Kimmeridge 2) and held in the BGS national borehole archive at Keyworth, Nottingham. Biozonal nomenclature used in the text follows the conventions discussed by Cox (1990), in regarding Jurassic ammonite zones as chronostratigraphical units, referred to by species name with an initial capital letter written in non-italicized text.…”
Section: Discussionmentioning
confidence: 99%
“…Deposition of the Oxford Clay Formation (Callovian/Oxfordian) coincided with a period of marked crustal extension and fracturing associated with North Atlantic rifting (Wilhelm 2014). Mid Jurassic (Late Toarcian -Bathonian) thermal doming of the North Sea region began to subside in the Early Callovian (Underhill 1998), although the dome flanks persisted as a positive structural entity (Bradshaw et al 1992).…”
Facies variability of mudstones is likely greater than generally perceived, with important implications for their behaviour in major civil engineering, energy and waste disposal applications. Here, we explore this variability for the UK Oxford Clay, a widely studied Middle/Upper Jurassic mudstone. Evidence from wire-line logs, geochemistry, sequence stratigraphy and biofacies analyses are combined to reveal heterogeneity within the Peterborough Member (Lower Oxford Clay) and to explore the extent to which it blanketed basin features or responded dynamically to them. Thickness modelling suggests that the Mid North Sea High, formed by Mid Jurassic thermal doming, likely influenced sediment pathways, favouring thick sediment accumulation in the Wessex Basin, thinner successions across the East Midlands Shelf, and sediment starvation in the Weald Basin. Biofacies patterns, determined using a novel combination of detrended correspondence and cluster analysis, vary significantly and suggest a complex patchwork of environments related to local basin setting. The Type Section of the Peterborough Member seems to represent only a narrow range of conditions that influenced its deposition, and cautions against developing basin-scale models based on a few well exposed and heavily researched outcrop successions.
“…It means that both must be made. In the style of Scotese, Boucot & McKerrow (1999), Dercourt, Ricou & Vrielynck (1993), Dercourt, Guetani & Vrielynck (2000), Golonka (2007 a , b , c , 2009) or others (see Vérard, in press), it would be useful to define lithostratigraphic and/or palaeoenvironmental maps based on the Panalesis model (as was done by Wilhem, 2014 for the UNIL model; Fig. 5).…”
Section: Advances In Palaeogeographymentioning
confidence: 99%
“…Figure 5.Illustration of synergies envisaged for a coupled model such as Panalesis . In addition to the climate model (MITgcm; middle right) and vegetation model ( B IOME 4 , Kaplan, 2001; bottom right), other global models are aimed to be coupled such as mantle circulation models (here illustration after Davies et al 2012; bottom left), lithospheric plate stress model (here after van der Burgt et al 2013; middle left), tectonic model (here after Malatesta et al 2013; top left), lithostratigraphic model (here after Wilhem, 2014; middle top), tectonic–climate interaction model (topographic alteration after Willett, 1999; top right).…”
Palaeogeographic reconstructions have been proposed for years. The technique employed, however, is more or less always the same: it consists of determining the palaeoenvironment at the local scale and extending it to the regional scale. Such work is carried out in a maximum number of locations all over the planet and the global palaeogeography is the result of interpolation of those reconstructions. Advances in palaeogeography can be made via an alternative way, which consists of integrating and then coupling various global models. It results in the proposal of synthetic palaeogeographies that can be compared a posteriori to local or regional data. The advantage is twofold: (1) the view is really global and it avoids gaps (in particular in the oceanic realm) in the reconstructions, and it is very much less focused on the coastline; (2) it takes advantages from almost all the fields of geosciences, so that reconstructions can be constrained from a large variety of data. The two techniques – the ‘classic’ and the ‘alternative’ – are not contradictory but complementary, and it is desirable that one feeds the other and the study of palaeogeography be revived.
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