Pressure-temperature-deformation paths of closely associated ultra-high-pressure (diamond-bearing) crustal and mantle rocks of the Kimi complex: Implications for the tectonic history of the Rhodope Mountains, northern Greece

Mposkos, E; Krohe, A

dc.contributor.author	Mposkos, E	en
dc.contributor.author	Krohe, A	en
dc.date.accessioned	2014-03-01T01:24:53Z
dc.date.available	2014-03-01T01:24:53Z
dc.date.issued	2006	en
dc.identifier.issn	0008-4077	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17491
dc.subject	Ultra High Pressure	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.other	Deformation	en
dc.subject.other	Diamond deposits	en
dc.subject.other	Geochronology	en
dc.subject.other	Pressure effects	en
dc.subject.other	Rocks	en
dc.subject.other	Structural geology	en
dc.subject.other	Thermal effects	en
dc.subject.other	Crust rocks	en
dc.subject.other	Mantle rocks	en
dc.subject.other	Metamorphism	en
dc.subject.other	Subduction channel	en
dc.subject.other	Tectonics	en
dc.subject.other	deformation	en
dc.subject.other	diamond	en
dc.subject.other	eclogite	en
dc.subject.other	geochronology	en
dc.subject.other	mantle process	en
dc.subject.other	marble	en
dc.subject.other	orthogneiss	en
dc.subject.other	P-T conditions	en
dc.subject.other	P-T-t path	en
dc.subject.other	tectonic evolution	en
dc.subject.other	texture	en
dc.subject.other	ultrahigh pressure metamorphism	en
dc.subject.other	Eurasia	en
dc.subject.other	Europe	en
dc.subject.other	Greece	en
dc.subject.other	Rhodope Mountains	en
dc.subject.other	Southern Europe	en
dc.title	Pressure-temperature-deformation paths of closely associated ultra-high-pressure (diamond-bearing) crustal and mantle rocks of the Kimi complex: Implications for the tectonic history of the Rhodope Mountains, northern Greece	en
heal.type	journalArticle	en
heal.identifier.primary	10.1139/E06-064	en
heal.identifier.secondary	http://dx.doi.org/10.1139/E06-064	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	The ultra-high-pressure (UHP) Kimi complex (uppermost eastern Rhodope Mountains) is a tectonic mixture of crustal and mantle derived associations. Pressure-temperature (P-T) paths and microtextural and geochronological data reveal that crustal and mantle parts juxtaposed against each other at a depth corresponding to similar to 15 kbar (1 kbar = 100 MPa) had separate ascend histories. The crustal rocks comprise amphibolitised eclogites, orthogneisses, marbles, and migmatitic pelitic gneisses. The latter document UHP metamorphism within the dehydration-melting range of pelitic gneisses, with maximum P-T conditions of >45 kbar at similar to 1000 degrees degrees C, as determined by diamond inclusions in garnet and rutile needle exsolutions in Na-bearing garnet. Decompression was combined with only little cooling before 15 kbar, followed by more significant cooling between 15 and 10 kbar. This P-T path probably reflects ascent of UHP rocks within a subduction channel, followed by accretion in the lower crust of a thickened wedge. Although the first ascend phase was probably rapid, the overall time span for UHP metamorphism and final exhumation may have extended over more than 70 Ma. A U-Pb sensitive high-resolution ion microprobe (SHRIMP) age on zircons of +/- 149 Ma was suggested to date the UHP metamorphism, whereas Rb-Sr white mica and U-Pb zircon ages from syn-shearing pegmatites of +/- 65 Ma constrain medium- to low-grade shearing and final exhumation of UHP rocks. Mantle parts consisting of spinel-garnet metaperidotites and garnet pyroxenites reached maximum P-T conditions in the garnet-peridotite field at T > 1200 degrees C and P > 25 kbar. This was associated with plastic flow and followed by severe near isothermal cooling to T < 800 degrees C at 15 kbar and static annealing. A garnet-clinopyroxene whole-rock Sm-Nd age from a garnet pyroxenite of +/- 119 Ma probably reflects the age of metamorphic mantle processes (static annealing following the high P/high T strain episode), rather than constraining the age of UHP metamorphism.	en
heal.publisher	NATL RESEARCH COUNCIL CANADA-N R C RESEARCH PRESS	en
heal.journalName	Canadian Journal of Earth Sciences	en
dc.identifier.doi	10.1139/E06-064	en
dc.identifier.isi	ISI:000245120500001	en
dc.identifier.volume	43	en
dc.identifier.issue	12	en
dc.identifier.spage	1755	en
dc.identifier.epage	1776	en