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Strontium-, carbon- and oxygen-isotope compositions of marbles from the Cycladic blueschist belt, Greece

Published online by Cambridge University Press:  03 February 2011

CLAUDIA GÄRTNER ,
MICHAEL BRÖCKER ,
HARALD STRAUSS  and
KATJA FARBER
CLAUDIA GÄRTNER*
Affiliation:
Institut für Mineralogie, Universität Münster, Corrensstr. 24, 48149 Münster, Germany Institut für Geologie und Paläontologie, Universität Münster, Corrensstr. 24, 48149 Münster, Germany
MICHAEL BRÖCKER
Affiliation:
Institut für Mineralogie, Universität Münster, Corrensstr. 24, 48149 Münster, Germany
HARALD STRAUSS
Affiliation:
Institut für Geologie und Paläontologie, Universität Münster, Corrensstr. 24, 48149 Münster, Germany
KATJA FARBER
Affiliation:
Institut für Mineralogie, Universität Münster, Corrensstr. 24, 48149 Münster, Germany
*
†Author for correspondence: [email protected]
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Abstract

The Cycladic blueschist belt, Greece, is mostly submerged below sea level and regional correlations are difficult to establish. Marbles are widespread within the belt and locally used as marker horizons to subdivide monotonous schist sequences. However, owing to the lack of distinctive petrographic characteristics, the marbles have not been used for island-to-island correlations. This study aims to investigate the potential of Sr-, C- and O-isotope compositions of marbles as a tool for unravelling the litho- and/or tectonostratigraphic relationships across the Cycladic islands, and as a proxy for the time of sediment formation. For this purpose, we have studied metamorphic carbonate rocks from the islands of Tinos, Andros, Syros, Sifnos and Naxos. Identical 87Sr/86Sr values for certain marble horizons occurring on Tinos, Andros and Sifnos are interpreted to document coeval regional carbonate precipitation. The 87Sr/86Sr values of the apparently least altered samples intersect the seawater curve multiple times within the most likely time interval of original carbonate precipitation (< 240 Ma; as indicated by previously published ion probe U–Pb zircon data) and thus an unequivocal age assignment is not possible. Very broad temporal correlations are possible, but more subtle distinctions are not feasible. On Andros, the overlapping Sr-isotope values of marbles representing the lowest and highest parts of the metamorphic succession are in accordance with a model suggesting isoclinal folding or thrusting of a single horizon, or very fast sedimentation. In contrast, distinct 87Sr/86Sr values for samples from Tinos, representing different levels of the metamorphic succession, suggest that these rocks represent a temporal succession and not the tectonic repetition of a single horizon. Based on Sr-, O- and C-isotope characteristics alone the time equivalence of marbles occurring on different islands could not be documented unambiguously. However, by using various combinations of these parameters, some occurrences can be discriminated from the overall sample population. The new data further accentuate the general potential of coupled Sr-, C- and O-isotope characteristics for identification of archaeological provenance and complement existing datasets for Aegean marbles.

Keywords

Sr isotopesC and O isotopesmarbleCycladic blueschist beltGreece
Type
Original Article
Information
Geological Magazine , Volume 148 , Issue 4 , July 2011 , pp. 511 - 528
Copyright
Copyright © Cambridge University Press 2011

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