Deep structure of the Scottish Caledonides revealed by the MOIST reflection profile

Smythe, David; Dobinson, Alan; McQuillin, R.; Brewer, Jonathan A.; Matthews, D. H.; Blundell, D. J.; Kelk, Brian

doi:10.1038/299338a0

Cited by 145 publications

(42 citation statements)

References 15 publications

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“…Hsii (1979) argues for tectonic thickening in the Alps; he shows that a balanced cross-section across the Swiss Alps, down to the Moho, can be drawn which is consistent with the structural, seismic reflection, gravity and geomorphological evidence and this section involves a series of southward-dipping underthrusts, reaching down to, but not cutting, the Moho and which cause velocity inversions within the crust. Some recent seismic reflection surveys (Smythe et al 1982) on the other hand suggest the existence of thrusts which cut through, rather than become listric at, the crust-mantle interface (Moho).…”

Section: Collision Modelsmentioning

confidence: 99%

Precambrian collision tectonics in Africa

Shackleton

1986

173

104

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Summary Stages of the collisional process are separated. Criteria are proposed by which A- and B-subduction may be distinguished. Late Precambrian structures in NE Africa are attributed to successive gentle collisions of island arcs; the sutures dip E or SE and relative plate motion was NW-SE. In the polycyclic Proterozoic Mozambique Belt of E Africa there are probably three sutures (Sekerr, Baragoi, Moyale-Shakiso) with ophiolites; they appear to dip E. It is argued that despite the lack of geochronological evidence, Archaean basement probably underlies the metasedimentary sequences, right across the Mozambique Belt of E Africa, from the Archaean Tanzania Craton on the W to the Archaean Craton, represented by Madagascar and S India, on the E. The belt is therefore interpreted as having been built by collision of continental plates. Widespread recumbent structures, complex and intense deformation and high-grade metamorphism imply crustal thickening and a multistage collisional history. Relative NW-SE motion was probably followed by N-S post-collisional ductile shear. The Archaean Limpopo Belt in southern Africa shows evidence of drastic crustal thickening and intense deformation in contrast to the much weaker deformation and little crustal thickening in the Kaapvaal and Rhodesian Cratons to the S and N. Collision is implied but in the absence of convincing ophiolites, subduction-type calc-alkaline magmatism and abyssal sediments, B-subduction remains unproven.

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Section: Collision Modelsmentioning

confidence: 99%

Precambrian collision tectonics in Africa

Shackleton

1986

173

104

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“…They can be used for the reconstruction of large-scale tectonics in orogenic belts since they accommodate a large part of the regionally imposed deformation and are relatively easy to map or to detect on seismics (e.g. CAZES et al, 1985;SMITHSON et al, 1979;SMYTHE et al, 1982;PASSCHIER, 1986a). Flow in shear zones is often assumed to approach simple shear parallel to zone boundaries because of monoclinic shape fabric elements and high finite strain in the zone, which is absent or less pronounced in the wall rock.…”

Section: Introductionmentioning

confidence: 98%

Analysis of deformation paths in shear zones

Passchier

1988

Geol Rundsch

114

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“…1a). Seismic reflection profiles suggest that the Outer Hebrides Fault Zone dips consistently at c. 25°E to SE down into the lower crust, intersecting and possibly offsetting the Moho at c. 25 km depth (Smythe et al 1982;Peddy, 1984). Interpretations of offshore borehole and seismic reflection data suggest that the fault zone was active during Proterozoic, Carboniferous and Mesozoic extension (e.g.…”

Section: Introductionmentioning

confidence: 99%

The initiation and early tectonic significance of the Outer Hebrides Fault Zone, Scotland

Imber¹,

Strachan

Holdsworth³

et al. 2002

Geol. Mag.

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Deep structure of the Scottish Caledonides revealed by the MOIST reflection profile

Cited by 145 publications

References 15 publications

Precambrian collision tectonics in Africa

Precambrian collision tectonics in Africa

Analysis of deformation paths in shear zones

The initiation and early tectonic significance of the Outer Hebrides Fault Zone, Scotland

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