A zircon study from the Rhodope metamorphic complex, N-Greece: Time record of a multistage evolution

Bauer, Christoph; Rubatto, Daniela; Krenn, Kurt; Proyer, Alexander; Hoinkes, G.

doi:10.1016/j.lithos.2007.05.003

Cited by 93 publications

(114 citation statements)

References 44 publications

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“…The prograde P-T path is clearly constrained to pressure and temperature below 1.5-1.7 GPa and 690-720 -0 C by the absence of the clinopyroxene. This indicates that peak P-T conditions were lower than those recorded in the Jurassic eclogites (>1.75 GPa and 700 0 C, Bauer et al 2007) and much lower than those recorded in the Jurassic diamond-bearing Grt-Ky gneisses (> 4 GPa and ~1000 0 C, Mposkos and Krohe, 2006). If the mineral assemblage of the Gorgona metaperidotite was formed during the Mesozoic metamorphic cycle then it was subducted to (much) lower depth within the subduction channel than the associated eclogites and diamond-bearing gneisses.…”

Section: Tectonic Implicationsmentioning

confidence: 72%

“…Minimum pressures of 1.3 GPa and temperatures of 650-700 o C are obtained from the amphibolitized eclogites for the HP event (Liati and Mposkos, 1990). In the tectonometamorphically equivalent Kimi area (eastern Rhodope) P-T conditions of ~700 o C and >1.75 GPa are reported for the eclogite stage followed by a temperature increase (~750 0 C) during the first stage of decompression (Bauer et al, 2007). Therefore, a relatively cool subduction gradient of around 12°C/km was logically assumed for the prograde part of the P-T path.…”

Section: Metamorphic Evolutionmentioning

confidence: 99%

“…Both mineral phases can be formed during decompression. In eclogites, the first stage of decompression is indicated by a temperature increase up to 750 0 C (Bauer et al 2007). Following a decompression path similar to that recorded in the associated eclogites, dolomite is formed before the decomposition of chlorite to olivine+spinel (Fig.…”

Section: Decompression Stagementioning

confidence: 99%

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Study of the Metamorphic Evolution of a Carbonate-Bearing Metaperidotite From the Sidironero Complex (Central Rhodope, Greece) Using P-T and P(t)-Xco2 Pseudosections

Μπόσκος¹,

Baziotis²

2017

geosociety

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The carbonate-bearing metaperidotite from Sidironero Complex, north of the Xanthi town is composed primarily of olivine and orthopyroxene megacrysts and of Ti-clinohumite, tremolite, chlorite, dolomite, magnesite, talc, antigorite and spinel group minerals. The metaperidotite underwent a prograde HP metamorphism probably isofacial with the neighboring amphibolitized eclogites. Calculated P-T and P(T)-X CO2 phase diagram sections (pseudosections) for the bulk rock composition showed that X CO2 in the fluid phase was extremely low (≤0.008) at the first stages of the metamorphism and increased up to 0.022 at the peak P-T conditions ~1.5 GPa and 6900 C. The prograde metamorphism probably started from a hydrated and carbonated assemblage including talc+chlo-rite+magnesite+dolomite and proceeded with tremolite and antigorite formation before olivine growth, and orthopyroxene formation after olivine growth . Matrix dolomite, breakdown of chlorite to Cr-spinel+olivine and of Ti-clinohumite to olivine+Mg-ilmenite occurred during decompression. The P-T path is constrained by the absence of clinopyroxene in the metaperidotite.

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Section: Tectonic Implicationsmentioning

confidence: 72%

Section: Metamorphic Evolutionmentioning

confidence: 99%

Section: Decompression Stagementioning

confidence: 99%

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Study of the Metamorphic Evolution of a Carbonate-Bearing Metaperidotite From the Sidironero Complex (Central Rhodope, Greece) Using P-T and P(t)-Xco2 Pseudosections

Μπόσκος¹,

Baziotis²

2017

geosociety

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“…The rocks within the suture zone experienced HP to UHP metamorphism with subsequent high-grade amphibolite-facies overprint, as recorded in metasediments and mafic rocks (Mposkos annd Kostopoulos, 2001;Liati and Seidel, 1996;Mposkos and Krohe, 2006). Recent studies on metamorphic zircons from the suture zone give ages of 171 Ma related to a posteclogite facies metamorphic stage and an age of 79 Ma attributed to amphibolite-facies metamorphism (Bauer et al 2007). The eclogite-facies metamorphic event took place at 19 kbar and 700 °C (Liati and Mposkos, 1990), and was followed by granulite facies-(P>15 kbar, T>800 °C) and amphibolite-facies overprint (8-11 kbar and 580-690 °C) as recorded from relict kyanite-eclogites (Liati and Seidel, 1996).…”

Section: XLVII No 1 -488mentioning

confidence: 98%

A new occurrence of pyrophanite from the amphibolite-hosted skarn in Western Kimmeria, Xanthi, Northern Greece.

et al. 2013

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A new occurrence of pyrophanite (MnTiO3) in Greece is described from the garnetclinopyroxene-wollastonite exoskarn of western Kimmeria. Hostrock of the pyrophanite-bearing skarn is amphibolite (retrogressed eclogites) of the Nestos suture zone in the Rhodope massif. In addition endo- and exo-skarns occur both in the Xanthi granodiorite and the surrouding marbles and consinst of diopside-vesuvianitequartz and wollastonite-garnet-calcite-quartz respectively. Pyrophanite formed in the prograde stage, together with garnet, pyroxene, wollastonite, titanite, zircon, rutile, thorite and ouranothorianite. Retrograde minerals are quartz, epidote, calcite, hematite, and sulfides. Chlorite-geothermometry revealed temperatures in the range from 300 to 350 oC for the retrograde event. Calcic garnets (andraditegrossular solid solutions) from the prograde amphibolite-hosted skarn are chemically zoned with either isotropic or anisotropic cores surrounded by non-cubic anisotropic rims, thus suggesting chemical disequilibrium or disordering phenomena during crystal growth. The pyrophanite crystals are included in titanite and are accompanied by U-rich thorium minerals (uranothorianite, thorite) and by rutile. Electron microprobe analyses indicate that the studied pyrophanites are solid solutions between end-member pyrophanite and ilmenite, with isomorphous substitution of Mn2+ by Fe2+. No Mg has been detected (geikielite end-member). The alteration of pyrophanite and rutile to titanite suggests an increase of fO2 values of the fluids, probably due to increased incursion of meteoric waters to the system. The assemblage thorite, uranothorianite, pyrophanite and zircon indicates a magmatic contribution from the Xanthi granodiorite.

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“…High-P metamorphism with peak conditions of 585 ± 32°C and 21.7 ± 1.1 kbar in kyanite eclogite and 619 ± 53°C and 16.9 ± 1.7 kbar in common eclogite from the Kechros Complex in the eastern Rhodope (Mposkos et al, 2012). Moreover, HP/UHP metamorphism has been reported from the Kimi Complex, which has minimum temperature of 800°C and pressure of 23 kbar (Bauer, Rubatto, Krenn, Proyer, & Hoinkes, 2007;Kreen, Bauer, Proyer, Klötzli, & Hoinkes, 2010).…”

Section: Tectonometamorphic Evolutionmentioning

confidence: 99%

Petrology and geochemistry of eclogites from the Biga Peninsula, Northwest Turkey

et al. 2012

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The Biga Peninsula in northwest Turkey contains high-pressure metabasic eclogite that occur in two localities; as lenses within a 2 km long, 500 m thick quartz-phengite schist slice that is in turn found in the greenschist-facies metasedimentary rocks of the Çamlıca metamorphics, in Çamlıca area, and in two north-south elongated eclogites occurring as a tectonic slice between Kazdağ Massif and Çetmi Group, in Çetmi area. The P-T conditions under which these two exposures of eclogites formed are important to quantify the tectonic processes of subduction, exhumation and emplacement that highpressure rocks of the Biga Peninsula record. New geochemical data suggest that both protoliths were N-type MORB basalt with high TiO 2 and K 2 O-Na 2 O content and Nb/Y ratios. Most eclogite samples have tholeiitic signatures volcanic arc settings. ∑REE abundances range from 47.55 to 107.4 ppm. Europium anomalies are slightly variable (Eu/Eu * = 0.9-1.1) and trace element contents are similar to typical MORB based on tectonic discrimination diagrams. All eclogite protoliths were probably derived from depleted mantle source, modified by fluids within the subduction zone. The high-P mineral assemblage in eclogites from both regions is omphacite + garnet + glaucophane + phengite + epidote + zoisite + quartz. The inclusions in garnet are glaucophane, quartz, phengite, Ca-amphibole and rutile. P-T conditions are similar to each other and constrained at 550-700°C and 16-24 kbar. Geochemical data and mineral chemistry indicate that the eclogites in the Biga Peninsula represent oceanic crust processed at significant depths (50-80 km) within the subduction channel and were juxtaposed with greenschist facies as a tectonic slice in the accretionary complex at higher structural levels.

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A zircon study from the Rhodope metamorphic complex, N-Greece: Time record of a multistage evolution

Cited by 93 publications

References 44 publications

Study of the Metamorphic Evolution of a Carbonate-Bearing Metaperidotite From the Sidironero Complex (Central Rhodope, Greece) Using P-T and P(t)-Xco2 Pseudosections

Study of the Metamorphic Evolution of a Carbonate-Bearing Metaperidotite From the Sidironero Complex (Central Rhodope, Greece) Using P-T and P(t)-Xco2 Pseudosections

A new occurrence of pyrophanite from the amphibolite-hosted skarn in Western Kimmeria, Xanthi, Northern Greece.

Petrology and geochemistry of eclogites from the Biga Peninsula, Northwest Turkey

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