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Metamorphism of the variegated sequence at Kallithea, Samos, Greece

Metamorphose einer bunten Serie bei Kallithea (Samos, Griechenland)

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Summary

The variegated sequence at Kallithea, westernmost part of the island of Samos, consists of pure dolomitic marbles, siliceous marbles, calc-silicate rocks and amphibolites. It was formed from a volcano-sedimentary series by a regional metamorphism under amphibolite facies conditions. Assuming a total fluid pressure of 5 kb, temperature may have reached 700°C. In the siliceous marbles, a retrogressive evolution is documented. The intrusion of the Kallithea igneous suite which took place about 10 Ma ago hardly affected the regional metamorphic sequence. The only exception are small veins of wollastonite in a silicate marble. In contrast to the other tectonic units which form the major part of Samos, no traces of high pressure minerals could be detected in the Kallithea metamorphics, suggesting a different geological history. The age and geotectonic position of the variegated sequence is unknown so far.

Zusammenfassung

Die bunte Serie von Kallithea (westlichster Teil der Insel Samos), bestehend aus reinen Dolomitmarmoren, Silikatmarmoren, Kalksilikatfelsen und Amphiboliten, geht auf eine vuikano-sedimentäre Folge zurück, die durch eine Regionalmetamorphose unter amphibolitfaziellen Bedingungen geprägt wurde. Hierbei dürften Temperaturen um 700°C erreicht worden sein, wenn man einen Gesamtdruck (P fl ) von 5 kb annimmt. In den Silikatmarmoren ist eine Abfolge retrograder Mineralreaktionen dokumentiert. Vor etwa 10 Millionen Jahren intrudierten in die regionalmetamorphe Serie dioritische bis granitische Magmen ohne das Nebengestein kontaktmetamorph zu überprägen. Eine Ausnahme bilden kleine Wollastonitäderchen in einem Silikatmarmor. Im Gegensatz zu den übrigen tektonischen Einheiten, die den größten Teil der Insel aufbauen, lassen sich in den Metamorphiten von Kallithea keine Anzeichen einer Hochdruckmetamorphose nachweisen, was auf eine abweichende geologische Geschichte hindeutet. Alter und geotektonische Stellung der bunten Serie von Kallithea sind bislang noch unbekannt.

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Herrn Professor Dr. Siegfried Matthes zum 70. Geburtstag gewidmet

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Mezger, K., Okrusch, M. Metamorphism of the variegated sequence at Kallithea, Samos, Greece. TMPM Tschermaks Petr. Mitt. 34, 67–82 (1985). https://doi.org/10.1007/BF01082458

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Keywords

  • Wollastonite
  • Tectonic Unit
  • Regional Metamorphism
  • Pressure Mineral
  • Dolomitic Marble