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

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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 http://hdl.handle.net/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.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

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