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Trace elements and tectonic relationships of basaltic rocks in the Ballantrae igneous complex, Ayrshire

Published online by Cambridge University Press:  01 May 2009

J. M. Wilkinson  and
J. R. Cann
J. M. Wilkinson
Affiliation:
School of Environmental SciencesUniversity of East AngliaNorwich, NOR 88C
J. R. Cann
Affiliation:
School of Environmental SciencesUniversity of East AngliaNorwich, NOR 88C
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Summary

In order to obtain further evidence for the tectonic environment of generation of the basaltic rocks of the Ballantrae igneous complex, specimens of pillow lavas, dolerites, glaucophane schists and amphibolites were analysed for Ti, Zr, Y and Nb. Using Ti–Zr–Y, Ti–Zr and Y/Nb diagrams, three different genetic groups have been distinguished – (i) hot-spot basalts round Downan Point, round Bennane Head as far N as Balcreuchan Port, and also within serpentinite around Lendalfoot, (ii) island arc low-potassium tholeiites between Balcreuchan Port and Gamesloup, and (iii) possible ocean floor basalts at Knockormal and Knocklaugh. The interrelationships of these groups are in doubt. The hot-spot basalts may have been erupted through oceanic crust, but they could have formed prior to, or subsequent to, the island arc activity. More likely, the hot-spot basalts formed (possibly on oceanic crust) at a considerable distance from the island arc, and the two were later brought together tectonically, probably at the subduction zone associated with the arc.

Type
Articles
Information
Geological Magazine , Volume 111 , Issue 1 , January 1974 , pp. 35 - 41
Copyright
Copyright © Cambridge University Press 1974

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References

Aumento, F. 1969. Diorites from the mid-Atlantic ridge at 45° N. Science, N. Y. 165, 1112–13.CrossRefGoogle Scholar
Bird, J. M., Dewey, J. F. & Kidd, W. S. F. 1971. Proto-Atlantic oceanic crust and mantle: Appalachian/Caledonian ophiolites. Nature Phys. Sci. 231, 28–31.Google Scholar
Bloxam, T. W. 1968. The petrology of Byne Hill, Ayrshire. Trans. R. Soc. Edinb. 68, 105–22.CrossRefGoogle Scholar
Bloxam, T. W. & Allen, J. B. 1960. Glaucophane schist, eclogite and associated rocks from Knockormal in the Girvan–Ballantrae complex, south Ayrshire. Trans. R. Soc. Edinb. 64, 1–27.Google Scholar
Cann, J. R. 1970. Rb, Sr, Y, Zr and Nb in some ocean floor basaltic rocks. Earth Planet. Sci. Lett. 10, 7–11.CrossRefGoogle Scholar
Church, W. R. & Gayer, R. A. 1973. The Ballantrae ophiolite. Geol. Mag. 110 (6).Google Scholar
Dewey, J. F. 1971. A model for the Lower Palaeozoic evolution of the southern margin of the early Caledonides of Scotland and Ireland. Scott. J. Geol. 7, 219–40.Google Scholar
Dewey, J. F., Rickards, R. B. & Skevington, D. 1970. New light on the age of Dalradian deformation and metamorphism in western Ireland. Norsk geol. Tidsskr. 50, 19–44.Google Scholar
Fitton, J. G. & Hughes, D. J. 1970. Volcanism and plate tectonics in the British Ordovician. Earth Planet. Sci. Lett. 8, 223–7.CrossRefGoogle Scholar
Mendum, J. R. 1968. Unconformities in the Ballantrae volcanic sequence. Trans. Leeds geol. Ass. 7, 261–4.Google Scholar
Mitchell, A. H. & Reading, H. G. 1971. Evolution of island arcs. J. Geol. 79, 253–84.CrossRefGoogle Scholar
Miyashiro, A., Shido, F. & Ewing, M. 1970. Crystallisation and differentiation in abyssal tholeiites and gabbros from mid-oceanic ridges. Earth Planet. Sci. Lett. 7, 361–5.CrossRefGoogle Scholar
Pearce, J. A. & Cann, J. R. 1971. Ophiolite origin investigated by discriminant analysis using Ti, Zr and Y. Earth Planet. Sci. Lett. 12, 339–49.Google Scholar
Pearce, J. A. & Cann, J. R. 1973. Tectonic setting of basic volcanic rocks determined using trace element analysis. Earth Planet. Sci. Lett. (in the Press).Google Scholar