Hostname: page-component-5c6d5d7d68-lvtdw Total loading time: 0 Render date: 2024-08-16T02:17:49.632Z Has data issue: false hasContentIssue false

A marginal Late Proterozoic ocean basin in the Welsh region

Published online by Cambridge University Press:  01 May 2009

J. W. Baker
Affiliation:
Geology Dept, University College, Cardiff

Summary

Re-assessment of the idea that the Monian and Longmyndian accumulated along the margin of a palaeo-ocean suggests that Monian sedimentation occurred near the eastern shoreline of a micro-continent. If Monian igneous activity, metamorphism and deformation are attributed to an underlying subduction zone, this must have dipped northwestwards away from a small ocean basin to the southeast. Consumption of this ocean floor brought about collision with the continental shield and simple deformation of the Longmyndian.

Type
Articles
Copyright
Copyright © Cambridge University Press 1973

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Baker, J. W. 1969. Correlation problems of metamorphosed Pre-Cambrian Rocks in Wales & S.E. Ireland. Geol. Mag. 106, 249–59.CrossRefGoogle Scholar
Baker, J. W. 1970. Petrology of the metamorphosed Pre-Cambrian rocks of Southeasternmost Co. Wexford, Eire. Proc. R. Ir. Acad. 693, 120.Google Scholar
Baker, J. W. 1971 a. The Proterozoic History of Southern Britain. Proc. Geol. Ass. 82, 249–66.CrossRefGoogle Scholar
Baker, J. W. 1971 b. Intra-Lower Palaeozoic faults in the Southern Irish Sea Area. Geol. Mag. 108, 491–8.CrossRefGoogle Scholar
Bird, J. M., Dewey, J. F. & Kidd, W. S. F., 1971. Proto-Atlantic ocean crust and mantle: Appalachian/Caledonian ophiolites. Nature Phys. Sci. 231, 2831.CrossRefGoogle Scholar
Burrett, C. F., 1972. Plate Tectonics and the Hercynian Orogeny. Nature, Lond. 239, 155–7.CrossRefGoogle Scholar
Church, W. R. & Gayer, R. A. (in press). The Ballantrae Complex. Geol. Mag.Google Scholar
Dewey, J. F., 1969. Evolution of the Appalachian/Caledonian orogen. Nature, Lond. 222, 124–9.CrossRefGoogle Scholar
Drake, C. L. & Girdler, R. W. 1964. A geophysical study of the Red Sea. Geophys. J. R. Astr. Soc. 8, 473–96.CrossRefGoogle Scholar
Fitton, J. G. & Hughes, D. J. 1970. Volcanism and plate tectonics in the British Ordovician. Earth Plan. Sci. Lett. 8, 223–8.CrossRefGoogle Scholar
Greig, D. C., Wright, J. E., Hains, B. A. & Mitchell, G. H. 1968. Geology of the country around Church Stretton, Craven Arms, Wenlock Edge and Brown Clee. Mem. geol. Surv. U.K.Google Scholar
Harland, W. B. & Gayer, R. A., 1972. The Arctic Caledonides and earlier oceans. Geol. Mag. 109, 289314.CrossRefGoogle Scholar
Rast, N. & Crimes, T. P. 1969. Caledonian erogenic episodes in the British Isles and northwestern France, and their tectonic and chronological interpretation. Tectono-physics, 7, 277307.CrossRefGoogle Scholar
Shackleton, R. M. 1969. The Pre-Cambrian rocks of North Wales. In Wood, A. (Ed.): The Pre-Cambrian and Lower Palaeozoic Rocks of Wales. Univ. Wales Press, Cardiff. 122.Google Scholar
Thorpe, R. S., 1972 a. Possible subduction zone origin for two Pre-Cambrian Calc-Alkaline plutonic complexes from southern Britain. Bull. geol. Soc. Am. 83, 3663–8.CrossRefGoogle Scholar
Thorpe, R. S., 1972 b. The geochemistry and correlation of the Warren House, the Uriconian and the Charnian Volcanic rocks from the English Pre-Cambrian. Proc. Geol. Ass. 83, 269–85.CrossRefGoogle Scholar
Thorpe, R. S., 1972 c. Ocean Floor Basalt Affinity of Pre-Cambrian Glaucophane Schist from Anglesey. Nature Phys. Sci. 240, 164–6.CrossRefGoogle Scholar
Zeigler, A. M. 1970. Geosynclinal development of the British Isles during the Silurian period. J. Geol. 78, 445–79.CrossRefGoogle Scholar