Geophysical images of the deep crust: the Iapetus suture

Beamish, David; Smythe, David

doi:10.1144/gsjgs.143.3.0489

Cited by 68 publications

(22 citation statements)

References 26 publications

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“…The Iapetus Province. Finally, overlying the site of the Iapetus suture (Dewey 1971(Dewey , 1982Soper & Hutton 1984, Beamish & Smythe 1986Klemperer & Matthews 1987) encompassing the Northumberland/Solway basin, a narrow province is identified where the Caledonian structure trends strongly ENE-WSW.…”

Section: Caledonian Structural Frameworkmentioning

confidence: 99%

A regional assessment of the intra-Carboniferous play of Northern England

Fraser¹,

Nash²,

Steele³

et al. 1990

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Abstract:Hydrocarbons have been produced from the Carboniferous of the East Midlands since the 1920s. Some 30 discoveries have been made to date and although field sizes are generally small, the relatively low costs have made exploration and development an attractive commercial proposition. Many of the factors which contribute to success in the East Midlands occur in other basins in Northern England but have not produced significant hydrocarbon accumulations. This paper examines the key attributes of the intra-Carboniferous play and through an integrated regional geological framework contrasts the successful East Midlands oil province with the other Carboniferous basins of Northern England.

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Section: Caledonian Structural Frameworkmentioning

confidence: 99%

A regional assessment of the intra-Carboniferous play of Northern England

Fraser¹,

Nash²,

Steele³

et al. 1990

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“…Midland Valley (Hall, 1984;Beamish and Smythe, 1986;Klemperer and Matthews, 1987; 142 Freeman et al 1988; Klemperer et al 1991). 143…”

Section: Introduction 45 46mentioning

confidence: 99%

Evidence for distinct stages of magma history recorded by the compositions of accessory apatite and zircon

Miles

Graham

Hawkesworth

et al. 2013

Contrib Mineral Petrol

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23 24 Accessory minerals contain a robust and accessible record of magma evolution. However, 25 they may reflect relatively late stage conditions in the history of the host magmas. In the 26 normally zoned Criffell granitic pluton (Scotland), whole-rock (WR) compositions reflect 27 open system assimilation and fractional crystallisation at depths of > 11 km, whereas 28 amphibole barometry and the absence of inherited zircon suggest that the observed mineral 29 assemblages crystallised following emplacement of magmas with little or no crystal cargo at 30 depths of 4 to 6 km. The crystallisation history is documented by large trace element 31 variations amongst apatite crystals from within individual samples: decreasing LREE and Th 32 concentrations in apatite crystals from metaluminous samples reflect broadly synchronous 33

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“…is a difficult question which cannot entirely be solved in the 2-D profiles that form the bulk of our information. However, wherever cross-profiles are available, the reality of most of the major seismic events can be demonstrated (see for instance Beamish & Smythe 1986;Hillis & Day 1987;Lueschen et al 1987;DEKORP Research Group 1988). Such a result probably comes from the fact that profiles were generally shot parallel to the main direction of tectonic transport.…”

Section: Introductionmentioning

confidence: 99%

Geological significance of seismic reflections in collision belts

Bois¹

1991

Geophysical Journal International

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Geological problems raised by the interpretation of deep seismic reflections in collision belts result from the structural complexity of the crust and the lack of surface control and well-documented references. Some of these problems are illustrated by examples coming from various tectonic settings in France and adjacent areas, and tentative interpretations are proposed. From field, conventional seismic and borehole data, interpretation of shallow structures such as thin-skinned detachments is fairly well controlled down to 5 s TWT, but deeper reflections are more difficult to interpret. The shallow detachments are linked to mid-crustal dipping reflections that are regarded as ramps, which may root into deeper intracrustal detachments. Dipping reflections may sometimes develop in the whole crust and produce puzzling criss-crossing patterns. The Wind River thrust provides a well-documented analogue' of such features, although it is located in the foreland of the belt. It suggests that this kind of feature was formed in a late stage of the tectonic development. The lack of any seismic image of the external thin-skinned detachment in large parts of the Palaeozoic belts of Europe can be explained by such a late deformation which affected the belts up to the suture areas. Interwedging patterns ('crocodile') are commonly associated with shallow ramp anticlines. Though hard to establish in the deep crust, interwedging may be present in collision belts as the result of lithosphere punching (e.g. Pyrenees) and/or reactivation of former antithetic shear zones. Steep faults, unambiguously cutting across the whole crust, are scarcely observed and seem to be restricted to areas where major transcurrent displacements are in progress. Dipping reflections across the deep crust and the upper mantle may be interpreted as the ghosts of former crustal slabs now largely metamorphosed in eclogites.

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Geophysical images of the deep crust: the Iapetus suture

Cited by 68 publications

References 26 publications

A regional assessment of the intra-Carboniferous play of Northern England

A regional assessment of the intra-Carboniferous play of Northern England

Evidence for distinct stages of magma history recorded by the compositions of accessory apatite and zircon

Geological significance of seismic reflections in collision belts

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