Silurian turbidite provenance and the closure of Iapetus

Williams, David M.; O'connor, P. D.; Menuge, Julian F.

doi:10.1144/gsjgs.149.3.0349

Cited by 24 publications

(13 citation statements)

References 46 publications

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“…The Lettergesh sandstones have a significant detrital volcanic component. It has been suggested that the rapid deposition of such a thick sedimentary succession was related to a major volcanic episode near the basin at this time (Williams, O'Connor & Menuge, 1992;Menuge, Williams & O'Connor, 1995). The deposition of the sandstones resulted in the accumulation of some 1300 m (compacted) of sediment between the uppermost Llandovery and the Lower Wenlock, possibly over two to three million years.…”

Section: Conglomerates and Sea-level Variationmentioning

confidence: 98%

Tectonic control on sedimentation during transgression: a case study from Silurian successions in Ireland and Scotland

O'connor

Williams

1999

Geol. Mag.

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The Silurian succession of North Galway is relatively well constrained in terms of environmental analysis and, in its lower half, palaeontologically. The initiation of a late Llandovery marine transgression can be demonstrated over fluviatile red sandstones. The deposition of shallow-water conglomerates at the base of a turbidite sequence within the succession indicates the long-lived presence of a channel system that was probably fault controlled. The back-stripping method allows a subsidence curve to be constructed for this succession. It demonstrates an initial period of rapid rift-related subsidence followed by a short-lived hiatus that may be due to the cessation of subduction in this part of the Caledonides. A comparison of the Galway subsidence curve with that of the Silurian succession at Girvan in Scotland shows strong, but diachronous, similarities. This tends to support an earlier suggestion that they formed part of a single but partitioned basin throughout most of the Silurian period. Although the eustatic fall in sea level at the Llandovery–Wenlock boundary can be recognized, the influence of tectonic regime and sedimentation rates were the controlling factors in determining relative sea levels.

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Section: Conglomerates and Sea-level Variationmentioning

confidence: 98%

Tectonic control on sedimentation during transgression: a case study from Silurian successions in Ireland and Scotland

O'connor

Williams

1999

Geol. Mag.

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“…The Wenlock epoch is regarded as the time when the Iapetus and Tornquist oceans closed (Williams, O'Connor & Menuge, 1992;Trench & Torsvik, 1992;Soper et al 1992). A waning subduction zone, with thickening crust, can give rise to alkaline magmas rich in HFSE and with potassic affinities, such as are found today in the form of shoshonite lavas at Stromboli, Aeolian Islands, which lies above 18 km of continental crust (Francalanci, Manetti & Peccerillo, 1989).…”

Section: Source and Tectonic Settingmentioning

confidence: 99%

Wenlock metabentonites from Gotland, Sweden: geochemistry, sources and potential as chemostratigraphic markers

Batchelor

Jeppsson

1999

Geol. Mag.

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Two metabentonite suites occur within the Wenlock limestones and marls of Gotland, one within the Slite Formation (M. belophorus to the C. ellesae biozones) and the other in the Mulde Formation (G. nassa–M. dubius Biozone). Their geochemical characteristics based on rare-earth element (REE) distributions in apatite crystals separated from the metabentonites suggest origins from three separate volcanic sources. One of these sources has an alkaline affinity, reflected in relatively high levels of Th, Nb and Zr, which suggests that it may have lain over thickening continental crust during the waning stages of the closure of the Tornquist Sea, while the other two represent calc-alkaline magmas. The source of the volcanic ash is placed some 400 km to the southwest of Gotland, on the Tornquist–Teysseyre Zone, which is the northernmost expression of the Trans-European Suture Zone. Distinctive differences in REE distribution in apatite from these metabentonites should assist in future correlation studies in Wenlock stratigraphy, both within the Baltic region and further afield.

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“…In Europe, early Wenlock tus reported from northern Eire (area 2a, Figure 9) are the ®nal expression of an episode of early Silurian volcanism on the Laurentian margin of Iapetus associated with continental collision (Williams et al 1992). The Wenlock tus and lavas of the Dingle Peninsula (area 2, Figure 9) are mentioned above (in the Intoduction).…”

Section: Nearby Wenlock Volcanismmentioning

confidence: 93%

Wenlock volcanism in the Welsh Basin

Cave

Loydell

1998

Geol. J.

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Within the Welsh Basin, proximal volcanism of Wenlock age is virtually unknown. However, two vitroclastic tuffs and a turbiditic tuffaceous mudstone have been discovered lying along the eastern side of the basin. Their sources have not been located, but the tuffaceous mudstone and the older tuff are both of riccartonensis Zone age and may be the products of the same event. The younger tuff is of early ludensis Zone age. All three occur in association with bentonites and represent, or were involved in, sedimentary instability. © 1998 John Wiley & Sons, Ltd.

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Silurian turbidite provenance and the closure of Iapetus

Cited by 24 publications

References 46 publications

Tectonic control on sedimentation during transgression: a case study from Silurian successions in Ireland and Scotland

Tectonic control on sedimentation during transgression: a case study from Silurian successions in Ireland and Scotland

Wenlock metabentonites from Gotland, Sweden: geochemistry, sources and potential as chemostratigraphic markers

Wenlock volcanism in the Welsh Basin

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