The Shuram-Wonoka event recorded in a high-grade metamorphic terrane: insight from the Scandinavian Caledonides

Melezhik, V.A., Roberts, D., Fallick, A.E. and Gorokhov, I.M. (2008) The Shuram-Wonoka event recorded in a high-grade metamorphic terrane: insight from the Scandinavian Caledonides. Geological Magazine, 145(2), pp. 161-172. (doi: 10.1017/S0016756807004189)

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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‰ 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 δ13Ccarb 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.

Item Type:Articles
Keywords:Caledonides; Ediacaran; marble; carbon; strontium; isotopes
Glasgow Author(s) Enlighten ID:Fallick, Professor Anthony
Authors: Melezhik, V.A., Roberts, D., Fallick, A.E., and Gorokhov, I.M.
Subjects:Q Science > QE Geology
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Geological Magazine

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