Petrogenesis of ultramafic rocks from the ultrahigh-pressure metamorphic kimi complex in Eastern Rhodope (NE Greece)

Baziotis, I; Mposkos, E; Asimow, PD

dc.contributor.author	Baziotis, I	en
dc.contributor.author	Mposkos, E	en
dc.contributor.author	Asimow, PD	en
dc.date.accessioned	2014-03-01T01:28:59Z
dc.date.available	2014-03-01T01:28:59Z
dc.date.issued	2008	en
dc.identifier.issn	0022-3530	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19068
dc.subject	Cumulate	en
dc.subject	Partial melting	en
dc.subject	Peridotite	en
dc.subject	Pyroxenite	en
dc.subject	UHP metamorphism	en
dc.subject.classification	Geochemistry & Geophysics	en
dc.subject.other	cumulate	en
dc.subject.other	fractionation	en
dc.subject.other	garnet	en
dc.subject.other	geochemistry	en
dc.subject.other	metaigneous rock	en
dc.subject.other	partial melting	en
dc.subject.other	peridotite	en
dc.subject.other	petrogenesis	en
dc.subject.other	pyroxenite	en
dc.subject.other	spinel	en
dc.subject.other	trace element	en
dc.subject.other	ultrahigh pressure metamorphism	en
dc.subject.other	Eastern Macedonia and Thrace	en
dc.subject.other	Eurasia	en
dc.subject.other	Europe	en
dc.subject.other	Greece	en
dc.subject.other	Rhodope	en
dc.subject.other	Southern Europe	en
dc.title	Petrogenesis of ultramafic rocks from the ultrahigh-pressure metamorphic kimi complex in Eastern Rhodope (NE Greece)	en
heal.type	journalArticle	en
heal.identifier.primary	10.1093/petrology/egn010	en
heal.identifier.secondary	http://dx.doi.org/10.1093/petrology/egn010	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	Widespread bodies of garnet-spinel metaperidotites with pyroxenitic layers occur in the ultrahigh-pressure metamorphic Kimi Complex. In this study we address the origin of such peridotite-pyroxenite associations in the context of polybaric melting regimes. We conduct a detailed geochemical investigation of major and trace element relations and compare them with a range of major element modelling scenarios. With increasing bulk-rock MgO content, the garnet-spinel metaperidotites exhibit decreasing CaO, Al2O3, TiO2, and Na2O along with increasing Ni and a gradually increasing Zr/Zr* anomaly, consistent with an origin as residues after variable degrees of melt extraction. The major element modelling further suggests a polybaric adiabatic decompression melting regime beginning at high to ultrahigh pressure, with an intermediate character between pure batch and fractional melting and a mean extent of melting of 9-11%. The pyroxenites exhibit major element compositions that cannot be reproduced by experimental or calculated melts of peridotite. Moreover, the Kimi pyroxenites have highly variable Ni and Sc contents and a wide range of Mg-number (0. 76-0.89), inconsistent with an origin as frozen melts or the products of melt-peridotite interaction. However, both the major element systematics and the observed rare earth element patterns, with both convex and concave shapes, can be explained by an origin as clinopyroxene-rich, high-pressure cumulates involving garnet and/or Cr-spinel. © The Author 2008. Published by Oxford University Press. All rights reserved.	en
heal.publisher	OXFORD UNIV PRESS	en
heal.journalName	Journal of Petrology	en
dc.identifier.doi	10.1093/petrology/egn010	en
dc.identifier.isi	ISI:000255152700002	en
dc.identifier.volume	49	en
dc.identifier.issue	5	en
dc.identifier.spage	885	en
dc.identifier.epage	909	en