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Indirect dating of tectonic events by Rb—Sr analysis of syntectonic garnets: an example from schists of the Seve Nappe, central Scandinavian Caledomdes

Published online by Cambridge University Press:  01 May 2009

A. P. S. Reymer
A. P. S. Reymer
Affiliation:
Institute of Earth Sciences, Department of Geology, The Hebrew University, Jerusalem, Israel
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Summary

Rb-Sr analyses of syntectonic single-crystal garnets from the Svartsobacken and Dikanas schist units of the Seve Nappe, Scandinavian Caledonides, show systematic differences. One group yields a Precambrian age spectrum consistent with that given by whole-rock analyses; the other group gives Caledonian ages similar to those given by mica analyses. It follows that the tectonic events reflected in the garnet inclusion patterns are also of different ages and, subject to certain limitations, the method can be used to provide a clearer interpretation of the deformational and metamorphic history of the rock.

Type
Articles
Information
Geological Magazine , Volume 119 , Issue 6 , November 1982 , pp. 599 - 604
Copyright
Copyright © Cambridge University Press 1982

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References

Ferguson, C. C., Harvey, P. K. & Lloyd, G. E. 1980. On the mechanical interaction between a growing porphyroblast and its surrounding matrix. Contr. Miner. Petrol. 75, 339–52.CrossRefGoogle Scholar
Gee, D. G. 1975. A tectonic model for the central part of the Scandinavian Caledonides. Am. J. Sci. 275 A, 468–515.Google Scholar
Reymer, A. P. S. 1979. Investigation into the metamorphic nappes of the Central Scandinavian Caledonides on the basis of Rb-Sr and K-Ar age determinations. Ph.D. thesis, Univ. Leiden, 123 pp. (copies available on request).Google Scholar
Reymer, A. P. S., Boelrijk, N. A. I. M., Hebeda, E. H., Priem, H. N. A., Verdurmen, E. A. Th. & Verschure, R. H. 1980. A note on Rb-Sr whole-rock ages in the Seve Nappe of the Central Scandinavian Caledonides. Norsk Geol. Tidsskr. 60, 139–47.Google Scholar
Rosenfeld, J. L. 1970. Garnets in metamorphic rocks. Spec. Pap. geol. Soc. Am. 129.Google Scholar
Schoneveld, C. 1977. A study of some typical inclusion patterns in strongly paracrystalline rotated garnets. Tectonophysics 39, 453–71.Google Scholar
Steiger, R. H. & Jäger, E. 1977. Convention on the use of decay constants in geo-and cosmochronology. Earth Planet. Sci. Lett. 36, 359–62.CrossRefGoogle Scholar
Trouw, R. 1973. Structural geology of the Marsfjallen area, Caledonides of Västerbotten, Sweden. Sver. Geol. Undrs. C 689.Google Scholar
Vernon, R. H. 1978. Porphyroblast-matrix microstructural relationships in deformed metamorphic rocks. Geol. Rdsch. 67, 288–305.Google Scholar
Yardley, B. W. D. 1977. An empirical study of diffusion in garnet. Am. Miner. 62, 793–800.Google Scholar
Zachrisson, E. 1969. Caledonian geology of northern Jämtland-southern Västerbotten. Sver. Geol. Undrs. 644, 1–33.Google Scholar
Zwart, H. J. 1974. Structure and metamorphism in the Seve-Köli Nappe Complex (Scandinavian Caledonides) and its implications concerning the formation of metamorphic nappes. Cent. Soc. Geol. Belg., 129–44.Google Scholar