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Geochemistry of the Serifos calc-alkaline granodiorite pluton, Greece: constraining the crust and mantle contributions to I-type granitoids

Stouraiti, C. and Baziotis, I. and Asimow, P. D. and Downes, H. (2018) Geochemistry of the Serifos calc-alkaline granodiorite pluton, Greece: constraining the crust and mantle contributions to I-type granitoids. International Journal of Earth Sciences, 107 (5). pp. 1657-1688. ISSN 1437-3254. http://resolver.caltech.edu/CaltechAUTHORS:20171128-104218804

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Abstract

The Late Miocene (11.6–9.5 Ma) granitoid intrusion on the island of Serifos (Western Cyclades, Aegean Sea) is composed of syn- to post-tectonic granodiorite with quartz monzodiorite enclaves, cut by dacitic and aplitic dikes. The granitoid, a typical I-type metaluminous calcic amphibole-bearing calc-alkaline pluton, intruded the Cycladic Blueschists during thinning of the Aegean plate. Combining field, textural, geochemical and new Sr–Nd–O isotope data presented in this paper, we postulate that the Serifos intrusion is a single-zoned pluton. The central facies has initial ^(87)Sr/^(86)Sr = 0.70906 to 0.7106, ε_(Nd)(t) = − 5.9 to −  7.5 and δ^(18)Ο_(qtz) = + 10 to + 10.6‰, whereas the marginal zone (or border facies) has higher initial ^(87)Sr/^(86)Sr = 0.711 to 0.7112, lower ε_(Nd)(t) = −  7.3 to − 8.3, and higher δ^(18)Ο_(qtz) = + 10.6 to + 11.9‰. The small range in initial Sr and Nd isotopic values throughout the pluton is paired with a remarkable uniformity in trace element patterns, despite a large range in silica contents (58.8 to 72 wt% SiO_2). Assimilation of a crustally derived partial melt into the mafic parental magma would progressively add incompatible trace elements and SiO2 to the evolving mafic starting liquid, but the opposite trend, of trace element depletion during magma evolution, is observed in the Serifos granodiorites. Thermodynamic modeling of whole-rock compositions during simple fractional crystallization (FC) or assimilation-fractional crystallization (AFC) processes of major rock-forming minerals—at a variety of pressure, oxidation state, and water activity conditions—fails to reproduce simultaneously the major element and trace element variations among the Serifos granitoids, implying a critical role for minor phases in controlling trace element fractionation. Both saturation of accessory phases such as allanite and titanite (at SiO_2 ≥ 71 wt%)(to satisfy trace element constraints) and assimilation of partial melts from a metasedimentary component (to match isotopic data) must have accompanied fractional crystallization of the major phases.


Item Type:Article
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URLURL TypeDescription
https://doi.org/10.1007/s00531-017-1565-7DOIArticle
https://link.springer.com/article/10.1007%2Fs00531-017-1565-7PublisherArticle
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ORCID:
AuthorORCID
Asimow, P. D.0000-0001-6025-8925
Additional Information:© 2017 Springer-Verlag GmbH Germany, part of Springer Nature. Received: 22 July 2016; Accepted: 17 November 2017; First Online: 28 November 2017. Thorough and extensive reviews by J. F. Moyen and R. Bolhar were welcomed. We appreciate the efficient editorial handling and constructive opinions on improving the manuscript by W. C. Dullo and the subject editor M. Elburg. We would like to thank Professor John Tarney (Leicester University) for his assistance in accomplishing research work at the University of Leicester. We greatly appreciate the invaluable assistance of Nick Marsh (XRF analysis) and Rob Wilson (electron microprobe analysis) at Leicester and of Andy Beard at Birkbeck, University of London. Field and analytical work was supported by the State Scholarship Foundation of Greece (IKY) and isotopic analyses by NERC (UK). We are particularly pleased to acknowledge Peter Greenwood and Barbara Barreiro (NERC Isotope Geoscience Laboratory). We would also like to acknowledge the authors of GCDkit software (V. Janoušek, G. Farrow and V. Erban) for providing free use of software to prepare geochemical plots. PDA acknowledges support from the US National Science Foundation, geoinformatics award EAR-1550934.
Funders:
Funding AgencyGrant Number
State Scholarship Foundation of GreeceUNSPECIFIED
Natural Environment Research Council (NERC)UNSPECIFIED
NSFEAR-1550934
Subject Keywords:I-type granodiorite; Mafic enclaves; MELTS modeling; Fractional crystallization; Assimilation; Sr–Nd–O isotopes; Subduction-related magmas
Record Number:CaltechAUTHORS:20171128-104218804
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20171128-104218804
Official Citation:Stouraiti, C., Baziotis, I., Asimow, P.D. et al. Int J Earth Sci (Geol Rundsch) (2018) 107: 1657. https://doi.org/10.1007/s00531-017-1565-7
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83508
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:28 Nov 2017 18:53
Last Modified:05 Jul 2018 17:56

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