K/Ar mineral geochronology of the northern part of the Sithonia Plutonic Complex (Chalkidiki, Greece): Implications for its thermal history and geodynamic interpretation

Kyriaki Pipera, Antonis Koroneos, Triantafyllos Soldatos, Zoltán Pécskay, Georgios Christofides

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2 Citations (Scopus)

Abstract

New K/Ar mineral ages of thirty nine samples (biotite, muscovite, K-feldspar) from the two-mica granodiorite to granite and leucogranite of the northern part of the Sithonia Plutonic Complex (Chalkidiki, Greece) are given in the present study. These data along with existing Rb/Sr mica and U/Pb zircon ages are used to investigate the thermal history of the plutonic complex and shed light on the process that affected it, and caused discordant Rb/Sr and K/Ar mineral ages. The K/Ar mineral dating yielded ages ranging from 38 to 49 Ma for muscovites, 32 to 47 Ma for biotites and 37 to 43 Ma for K-feldspars, respectively. The comparison of the K/Ar, Rb/Sr and U/Pb mineral ages and the closure temperatures of the different isotopic systems for the different minerals indicate a rapid cooling rate for the Sithonia pluton. The latter supports the hypothesis that the pluton was formed in a post orogenic extensional regime. Moreover, the K/Ar mineral isochrones indicate that a reheating of the pluton took place before 37 Ma and partially rejuvenated the K/Ar and Rb/Sr isotopic system of the minerals.

Original languageEnglish
Pages (from-to)133-140
Number of pages8
JournalGeologica Carpathica
Volume64
Issue number2
DOIs
Publication statusPublished - Apr 1 2013

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Keywords

  • K/Ar geochronology
  • Sithonia plutonic complex
  • Tertiary granitoids of Rhodope
  • Thermal evolution

ASJC Scopus subject areas

  • Geology

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