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

  title={Geometry and growth of sill complexes: insights using 3D seismic from the North Rockall Trough},
  author={Ken Thomson and Donald H. W. Hutton},
  journal={Bulletin of Volcanology},
Doleritic sill complexes, which are an important component of volcanic continental margins, can be imaged using 3D seismic reflection data. This allows unprecedented access to the complete 3D geometry of the bodies and an opportunity to test classic sill emplacement models. The doleritic sills associated with basaltic volcanism in the North Rockall Trough occur in two forms. Radially symmetrical sill complexes consist of a saucer-like inner sill at the base with an arcuate inclined sheet… 
Magma transport through the crust via interconnected sill complexes
Three-dimensional seismic data from the volcanic margin offshore Norway have been used to map the complex three-dimensional geometry of two major sill complexes. These data show that the complexes
Lithological and structural controls on the emplacement and morphology of sills in sedimentary basins
Abstract Three-dimensional seismic data from the NW European Atlantic margin provide detailed data on the relationships between sills, dykes, laccoliths and pre-existing basin structure. The data
Determining magma flow in sills, dykes and laccoliths and their implications for sill emplacement mechanisms
Three-dimensional seismic data from the Faeroe-Shetland Basin provides detailed information on the relationships between sills, dykes, laccoliths and contemporaneous volcanic activity. The data shows
3-D seismic imaging of the plumbing system of the Kora Volcano, Taranaki Basin, New Zealand: The influence of syn-rift structure on shallow igneous intrusion architecture
Descriptions of the interactions between volcano plumbing systems and early-stage rift systems dominated by large half grabens and tilted fault blocks are scarce and lack detail. 3-D seismic
Saucer-shaped sill with lobate morphology revealed by 3D seismic data: implications for resolving a shallow-level sill emplacement mechanism
We use 3D seismic data to describe the 3D geometry of a large igneous intrusion, the Solsikke Compound Sill, and address a number of issues related to sill emplacement. The Solsikke Compound Sill
Hybrid flow sills: A new mode of igneous sheet intrusion
Three-dimensional (3-D) seismic mapping of the Vigra sill complex has revealed a series of shallow level lobate sills. This complex was emplaced ca. 55 Ma as part of the igneous activity associated
Seismic Interpretation of Sill- 1 Complexes in Sedimentary Basins: The 2 ‘Sub-Sill Imaging Problem’
Application of 3D-seismic reflection-data to igneous systems in sedimentary basins has led to 20 a revolution in the understanding of mafic sill-complexes. However, there is considerable 21
Comment on: Determining magma flow in sills, dykes and laccoliths and their implications for sill emplacement mechanisms by Ken Thomson [Bulletin of Volcanology 70: 183–210]
Thomson (2007) “demonstrate[d] that...upwards and outwards branching magma flow networks are common to all doleritic sills intruded into sedimentary sequences”. This statement stemmed from


Three-dimensional seismic imaging of Paleogene dike-fed submarine volcanoes from the northeast Atlantic margin
We use three-dimensional seismic data to describe the architecture of shallow intrusive igneous sill and dike complexes intruded into the upper crust as well as the internal and external geometry of
Morpho-tectonics and mechanism of emplacement of the dolerite rings and sills of the western Karoo, South Africa
The dolerite sill and ring-like structures of the Karoo Basin have been a matter of debate for a considerable period of time. However, the mechanism for their emplacement still remains an enigma. A
Shallow dolerite intrusion and phreatic eruption in the Allan Hills region, Antarctica
Abstract Shallow intrusion of dolerite sills into porous and permeable Permian-Triassic strata in the Allan Hills region resulted in steam pressures which exceeded that of the roof rocks causing
Magma and sediment-I Emplacement mechanism of late Carboniferous tholeiite sills in northern Britain
Like other great tholeiite sheets of the world, the Midland Valley Sill and Whin Sill were emplaced in thick accumulations of sediments which, at the time of intrusion, were not much older nor had
Late Cretaceous basalts from Rosemary Bank, Northern Rockall Trough
Abstract A borehole drilled on the top of Rosemary Bank (Rockall Trough, NE Atlantic), recovered 16.72m of basalts and volcaniclastic sediments beneath a 1.53m thick limestone with basalt clasts,
Emplacement of the Great Whin Dolerite Complex and the Little Whin Sill in relation to the structure of northern England
SUMMARY By definition, sills are concordant, tabular sheet-like bodies of igneous rock with the Great Whin Sill of northern England often quoted as a primary example. Analysis of surface and
History of Tertiary igneous activity in the N Atlantic borderlands
  • B. Upton
  • Geology
    Geological Society, London, Special Publications
  • 1988
Summary Stretching and thinning of the Laurasian continental lithosphere, which had proceeded intermittently from late Palaeozoic through the Mesozoic, reached a climax in early Tertiary times with
New K-Ar ages, and a provisional chronology, for the offshore part of the British Tertiary Igneous Province
Synopsis New K-Ar whole-rock ages are presented from 13 offshore locations to the north and west of Scotland. Ten of these locations have yielded ages which are considered to be geologically
Rockall Trough—Cretaceous or Late Palaeozoic?
  • D. Smythe
  • Geology, Geography
    Scottish Journal of Geology
  • 1989
Synopsis The Rockall Trough is the most southerly and widest part of the pre-Tertiary ‘proto North Atlantic’ rift zone running from the Porcupine Bank region west of Ireland to the Vøring Plateau off