An integrated zircon geochronological and geochemical investigation into the Miocene plutonic evolution of the Cyclades, Aegean Sea, Greece: part 2-geochemistry

Bolhar, Robert, Ring, Uwe, Kemp, Anthony I. S., Whitehouse, Martin J., Weaver, Steve D., Woodhead, Jon D., Uysal, I. Tonguc and Turnbull, Rose (2012) An integrated zircon geochronological and geochemical investigation into the Miocene plutonic evolution of the Cyclades, Aegean Sea, Greece: part 2-geochemistry. Contributions to Mineralogy and Petrology, 164 6: 915-933. doi:10.1007/s00410-012-0759-z


Author Bolhar, Robert
Ring, Uwe
Kemp, Anthony I. S.
Whitehouse, Martin J.
Weaver, Steve D.
Woodhead, Jon D.
Uysal, I. Tonguc
Turnbull, Rose
Title An integrated zircon geochronological and geochemical investigation into the Miocene plutonic evolution of the Cyclades, Aegean Sea, Greece: part 2-geochemistry
Journal name Contributions to Mineralogy and Petrology   Check publisher's open access policy
ISSN 0010-7999
1432-0967
Publication date 2012-12
Sub-type Article (original research)
DOI 10.1007/s00410-012-0759-z
Volume 164
Issue 6
Start page 915
End page 933
Total pages 19
Place of publication Heidelberg, Germany
Publisher Springer
Collection year 2013
Language eng
Abstract Zircons from 14 compositionally variable granitic rocks were examined in detail using CL image-guided micro-analysis to unravel the complex magmatic history above the southward retreating Hellenic subduction zone system in the Aegean Sea. Previously published U-Pb ages document an episodic crystallisation history from 17 to 11 Ma, with peraluminous (S-type) granitic rocks systematically older than closely associated metaluminous (I-type) granitic rocks. Zircon O- and Hf isotopic data, combined with trace element compositions, are highly variable within and between individual samples, indicative of open-system behaviour involving mantle-derived melts and evolved supracrustal sources. Pronounced compositional and thermal fluctuations highlight the role of magma mixing and mingling, in accord with field observations, and incremental emplacement of distinct melt batches coupled with variable degrees of crustal assimilation. In the course of partial fusion, more fertile supracrustal sources dominated in the earlier stages of Aegean Miocene magmatism, consistent with systematically older crystallisation ages of peraluminous granitic rocks. Differences between zircon saturation and crystallisation temperatures (deduced from zircon Ti concentrations), along with multimodal crystallisation age spectra for individual plutons, highlight the complex and highly variable physico-compositional and thermal evolution of silicic magma systems. The transfer of heat and juvenile melts from the mantle varied probably in response to episodic rollback of the subducting lithospheric slab, as suggested by punctuated crystallisation age spectra within and among individual granitic plutons.
Keyword Aegean Sea
Granitic rocks
Hf isotopes
O isotopes
Subduction
Zircon
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 30 August 2012.

 
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