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Continental rift and oceanic protoliths of mafic–ultramafic rocks from the Kechros Complex, NE Rhodope (Greece): implications from petrography, major and trace-element systematics, and MELTS modeling

Baziotis, I. and Mposkos, E. and Asimow, P. D. (2014) Continental rift and oceanic protoliths of mafic–ultramafic rocks from the Kechros Complex, NE Rhodope (Greece): implications from petrography, major and trace-element systematics, and MELTS modeling. International Journal of Earth Sciences, 103 (4). pp. 981-1003. ISSN 1437-3254 . https://resolver.caltech.edu/CaltechAUTHORS:20140612-124914109

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Abstract

The whole-rock chemistry of eclogites, partially amphibolitized eclogites, and dyke amphibolites from the metamorphic Kechros complex in the eastern Rhodope Mountains preserves evidence of the geodynamic framework for the origin of their protoliths. Major and trace-element concentrations define two distinct protolith groups for the eclogites. The low-Fe–Ti (LFT) eclogites have low-TiO_2 content (<0.67 wt%), negative high field strength element anomalies, and variable enrichments in large ion lithophile elements (LILE). The rare earth element (REE) patterns are characterized by strong light-REE (LREE) enrichment and heavy-REE (HREE) depletion. The high-Fe–Ti (HFT) eclogites have small to moderate LILE enrichment and lack Nb anomalies. The REE patterns of the HFT eclogites are characterized by LREE depletion and relatively flat MREE–HREE patterns. The rock compositions and petrographic features of the LFT eclogites resemble gabbros formed in a continental rift environment with minor to moderate contamination of a mantle-derived mafic magma by continental crust, whereas the HFT eclogites resemble mafic rocks formed in extensional oceanic environments. We interpret the HFT suite to represent a later stage in an evolution from continental rift to open ocean, following the origin of the LFT suite. Dyke amphibolite compositions, except for probable SiO_2 loss associated with metamorphic dehydration reactions, appear to represent liquid compositions quenched in conduits through the lower crust. MELTS modeling shows that dyke amphibolite compositions can be related to each other by fractional crystallization under strongly oxidizing conditions at ~0.5 GPa pressure, and all can be derived from a low-degree melt of modified fertile peridotite from around 1.7 GPa. Cumulates crystallized from the parental liquids of the amphibolites under oxidizing conditions may have yielded the protoliths of the HFT suite.


Item Type:Article
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URLURL TypeDescription
http://dx.doi.org/10.1007/s00531-014-1007-8DOIArticle
http://link.springer.com/article/10.1007%2Fs00531-014-1007-8PublisherArticle
http://rdcu.be/twi6PublisherFree ReadCube access
ORCID:
AuthorORCID
Asimow, P. D.0000-0001-6025-8925
Additional Information:© 2014 Springer-Verlag Berlin Heidelberg. Received: 9 July 2013; Accepted: 15 February 2014; Published online: 7 March 2014.
Subject Keywords:Eclogites; Dyke amphibolites; MELTS modeling; Kechros complex; Rhodope
Issue or Number:4
Record Number:CaltechAUTHORS:20140612-124914109
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140612-124914109
Official Citation:Baziotis, I., Mposkos, E. & Asimow, P.D. Int J Earth Sci (Geol Rundsch) (2014) 103: 981. doi:10.1007/s00531-014-1007-8
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46244
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:12 Jun 2014 21:36
Last Modified:03 Oct 2019 06:42

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