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Geological Magazine; March 2008; v. 145; no. 2; p. 161-172; DOI: 10.1017/S0016756807004189
© 2008 Cambridge University Press (CUP)
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Right arrow Articles by MELEZHIK, V. A.
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The Shuram–Wonoka event recorded in a high-grade metamorphic terrane: insight from the Scandinavian Caledonides

V. A. MELEZHIK*,{dagger}, D. ROBERTS*, A. E. FALLICK{ddagger} and I. M. GOROKHOV§

* Geological Survey of Norway, N-7491 Trondheim, Norway
{ddagger} Scottish Universities Environmental Research Centre, G75 0QF East Kilbride, Glasgow, Scotland, UK
§ Institute of Precambrian Geology and Geochronology, nab. Makarova, 2, 199034 St Petersburg, Russia

{dagger} Author for correspondence: victor.melezhik{at}ngu.no

An approximately 250 m thick polydeformed and polymetamorphosed, isotopically unusual, variegated marble (locally termed the ‘Leivset marble’) shows a great lateral extent in the Scandinavian Caledonides. Its extremely 13C-depleted primary nature (–7.9 ± 1.2 {per thousand} on average, n = 93) makes the Leivset marble unique. This, together with a high Sr content (up to 8740 ppm) that buffered 87Sr/86Sr ratios between 0.70802 and 0.70872, suggests correlation with the worldwide Shuram–Wonoka isotopic event occurring within the 600–550 Ma time interval during the Ediacaran (Vendian) period. Despite a high-grade deformation and metamorphism, the Leivset marble has retained its original carbon and strontium isotope ratios. A combination of the variegated colour with unusually low {delta}13Ccarb can potentially be used for stratigraphic correlations in high-grade, non-fossiliferous, marble-dominated terranes across the Caledonian orogenic belt in Baltica and Laurentia. Isotope chemostratigraphy has identified a prominent cryptic stratigraphic discontinuity and suggests that the Ediacaran Leivset marble was tectonically juxtaposed above low-grade, Llandovery-age, fossiliferous marbles during the Scandian orogeny.

Key Words: Caledonides • Ediacaran • marble • carbon • strontium • isotopes






JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
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