Three-dimensional seismic imaging of Paleogene dike-fed submarine volcanoes from the northeast Atlantic margin

Davies, Richard J.; Bell, Brian R.; Cartwright, Joseph Albert; Shoulders, Simon J.

doi:10.1130/0091-7613(2002)030<0223:tdsiop>2.0.co;2

Cited by 90 publications

(54 citation statements)

References 9 publications

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“…3 and 4). Such geometries previously have been documented using 3D seismic data from the Faeroe-Shetland Basin (Davies et al 2002;Smallwood and Maresh 2002) and in classic onshore localities such as the Karoo of South Africa (Du Toit 1920;Chevalier and Woodford 1999), the Whin Sill (Francis 1982;Johnson and Dunham 2001), the Midland Valley Sill (Francis 1982) and in Tasmania (Leaman 1975). The largest sills in the North Rockall Trough displaying this geometry are roughly radially symmetrical and approximately 5 km wide (cf.…”

Section: Sill Complex Geometriesmentioning

confidence: 88%

Geometry and growth of sill complexes: insights using 3D seismic from the North Rockall Trough

Thomson

Hutton

2004

Bulletin of Volcanology

220

203

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Section: Sill Complex Geometriesmentioning

confidence: 88%

Geometry and growth of sill complexes: insights using 3D seismic from the North Rockall Trough

Thomson

Hutton

2004

Bulletin of Volcanology

220

203

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“…This approach has been defined as seismic volcanostratigraphy in the pioneering work of Planke et al (2000). Studies of intrusive features such as mafic sills (Hansen et al 2004) and extrusive features such as submarine volcanoes (Davies et al 2002) and subaqueous lava flows (Trude 2004) are showing a host of features that have not been observed using traditional outcrop methodologies, and there is much potential for further advances in this field.…”

Section: Igneous Geomorphologymentioning

confidence: 99%

Seismic geomorphology - an overview

Posamentier¹,

Davies

Cartwright

et al. 2007

152

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Seismic geomorphology, the extraction of geomorphic insights using predominantly three-dimensional seismic data, is a rapidly evolving discipline that facilitates the study of the subsurface using plan view images. A variety of analytical techniques is employed to image and visualize depositional elements and other geologically significant features. This volume presents key technical papers presented at a recent research conference -the Seismic Geomorphology Conference (10-11 February 2005), co-convened by the Society for Sedimentary Geology and The Geological Society (London). These papers cover a broad range of topics, from detailed depositional element analysis to big picture regional issues, from lithology prediction to diagenetic modification of the stratigraphic section. This discipline is only in its early stages of development and will henceforth expand rapidly in response to the growing availability to researchers of highquality three-dimensional seismic data.The derivation of stratigraphic insights from seismic data has its origins in the early 1970s with the advent of improved quality two-dimensional (2D) seismic data. The assumption that seismic amplitude reflections approximate geological time lines was fundamental to the development of seismic stratigraphy . The discipline of seismic stratigraphy traces its roots to the landmark publication of AAPG Memoir 26, which summarized the work of Peter Vail and his colleagues at Exxon Production Research Company . Discrete seismic reflection packages, or depositional sequences, were defined by discontinuities shown in seismic data by the downlap, onlap, truncation or toplap of seismic reflections . Such seismic discontinuities were interpreted to represent stratigraphic discontinuities and unconformities. Inferences with regard to lithologies were based upon internal reflection character such as reflection amplitude and continuity. These 2D-based interpretations were then mapped and the spatial distribution of depositional systems with associated lithological predictions subsequently interpreted.Seismic reflection technology underwent significant advances in the 1980s, making these data less expensive to acquire and hence more widely available. Three-dimensional (3D) seismic reflection data comprised acquisition of closely spaced 2D seismic lines with high precision navigation, which, when computationally manipulated, yielded true 3D coverage in X-Y-Z space. At first, such data were interpreted as a succession of parallel 2D seismic sections. Techniques included printing the lines on translucent vellum and interpreting each section while partially seeing the immediately adjacent section through the vellum. This approach made interpretation easier from the perspective of mapping horizons but did not truly take advantage of the 'third-dimension' inherent to the 3D volume. In essence this approach resulted in little more than a tightly spaced 2D seismic analysis. By the mid to late 1980s, computerbased display and visualization of 3D data began to ta...

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“…However, even in classic outcrop examples such as the Karoo sills of South Africa (Du Toit 1920), the true complexity of such variables is often underestimated as the available exposure limits amount of three-dimensional structural information that can be gathered. Given these limitations, the increasing availability of three-dimensional seismic data has provided an alternative approach with a number of recent studies investigating the emplacement of saucer-shaped doleritic sills (Bell and Butcher 2002;Davies et al 2002;Hansen et al 2004;Planke et al 2005;Hansen and Cartwright 2006). These have resulted in an improved understanding of sill morphology that has led most workers to invoke a laccolith-like mechanism of emplacement.…”

Section: Introductionmentioning

confidence: 98%

Determining magma flow in sills, dykes and laccoliths and their implications for sill emplacement mechanisms

Thomson

2007

Bull Volcanol

112

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Three-dimensional seismic data from the FaeroeShetland Basin provides detailed information on the relationships between sills, dykes, laccoliths and contemporaneous volcanic activity. The data shows that sills are predominantly concave upwards, being complete or partial versions of radially or bilaterally symmetrical forms that possess flat inner saucers connected to a flat outer rim by a steeply inclined sheet. Such morphologies are only partially modified by pre-existing faults. Sills can be sourced from dykes or the steep climbing portions of deeper sills. Both sills and dykes can provide magma to overlying volcanic fissures and sills can be shown to feed shallow laccoliths. Magma flow patterns, as revealed by opacity rendering, suggest that sills propagate upwards and outwards away from the magma feeder. As an individual sill can consist of several leaves emplaced at different stratigraphic levels, and as a sill or dyke can provide magma to volcanic fissures, other sills and laccoliths, the data suggests that neutral buoyancy concepts may not provide a complete explanation for the mechanism and level of sill emplacement. Instead, the data suggests that the presence of lithological contrasts, particularly ductile horizons such as overpressured shales may permit sill formation at any level below the neutrally buoyant level.

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Three-dimensional seismic imaging of Paleogene dike-fed submarine volcanoes from the northeast Atlantic margin

Cited by 90 publications

References 9 publications

Geometry and growth of sill complexes: insights using 3D seismic from the North Rockall Trough

Geometry and growth of sill complexes: insights using 3D seismic from the North Rockall Trough

Seismic geomorphology - an overview

Determining magma flow in sills, dykes and laccoliths and their implications for sill emplacement mechanisms

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