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Evidence that the foliated eclogite units originated as lavas or sediments implies that these units can be treated as a high‐grade part of the subduction‐related Sanbagawa metamorphism. Our results from the western terrane indicate high‐pressure eclogite facies peak conditions of ~800°C/22 kbar at ~25–20 Ma. Zircon grains from metapelitic samples from the western terrane also yield Early Jurassic metamorphic U‐Pb ages with REE signals that indicate coeval garnet growth. The eclogite facies is defined as a facies, in which the assemblages garnet + clinopyroxene + quartz and kyanite + clinopyroxene are stable in rocks with high Mg / Fe ratio. The assemblage olivine + garnet is also typomorphic to this facies This facies is characterized by the parageneses omphacite + garnet with kyanite or with orthorhombic pyroxene, which is due to the restricted range of bulk chemistry. However, the difficult problem concerning the eclogite facies stems from the fact that it cannot be referred to any of the metamorphic facies series. I investigated the metamorphic evolution of the eclogite-facies rocks in the St. Cyr klippe using isochemical phase equilibrium thermodynamic (pseudosection) modeling.

Eclogite facies

Knowledge of rock types other than basic rocks in this facies is very sparse. Yoder and Tilley (1962) give possible assemblages (Fig. 1). Eclogite Facies conditions of thermodynamic stability of eclogites, defined with respect to the principal factors of meta-morphism: pressure, temperature, and partial pressures of volatile components in fluids.

2011-07-02 · Most eclogite facies are eclogites– that is, they are basalts or gabbros which have experienced metamorphism at eclogite facies pressures and temperatures. However, sometimes other rock types (notably, granodiorites and pelites) may experience eclogite facies metamorphism, but these rocks are not proper eclogites, just eclogite facies rocks. The cogenetic eclogite-facies shear zones and pseudotachylytes were variably retrograded during Caledonian amphibolite-facies metamorphism.

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6 B). Eclogite Facies synonyms, Eclogite Facies pronunciation, Eclogite Facies translation, English dictionary definition of Eclogite Facies. n. A coarse-grained greenish rock consisting primarily of garnet and sodic pyroxene, and often including quartz, kyanite, and rutile. The metamorphic age of eclogite facies is 262+-5 Ma, which indicates the existence of a new Paleo-Tethyan suture zone in the Lhasa terrane (Yang et al., 2009).

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These rocks were investigated in detail and for the first time evidence for eclogite facies metamorphism at ca 25 kbar and 850 °C is provided. A Découvrez toute l’histoire de la pierre eclogite, son origine, sa composition, ses propriétés ainsi que ses vertus en lithothérapie. Pour en savoir plus Read Online Eclogite Facies Rocks and Download Eclogite Facies Rocks book full in PDF formats. To understand the relationships between eclogite‐facies mineral assemblages, deformation microstructures, and the seismic properties of subducting oceanic crust, eclogites from the Yuka terrane, North Qaidam ultrahigh‐pressure metamorphic belt, NW China, were studied. 2021-03-19 · The blueschist facies to eclogite facies transition involves glaucophane and paragonite reacting to form the garnet-omphacite assemblage: Gln + Pg = Prp + Jd+ Qtz + H2O at pressures greater than 1.2 GPa. But glaucophene alone may remain stable into the eclogite facies. (2005).

Consistent eclogite-facies metamorphic ages of 433–440 Ma are obtained for eclogite and orthogneiss collected from the Yuka terrane (Chen et al., 2009; Song et al., 2010, Song et al., 2012; Zhang et al., 2014; G. Zhang et al., 2016). Geochronology of eclogite facies metamorphism in the Sveconorwegian Province of SW Sweden Johansson, Leif LU ; Möller, Charlotte LU and Söderlund, Ulf LU ( 2001 ) In Precambrian Research 106 . p.261-275 Our results from the western terrane indicate high‐pressure eclogite facies peak conditions of ~800°C/22 kbar at ~25–20 Ma. Zircon grains from metapelitic samples from the western terrane also yield Early Jurassic metamorphic U‐Pb ages with REE signals that indicate coeval garnet growth.
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The eclogite-facies rocks occur 30-150 m thick shear zones surrounded by uneclogitized to partially eclogitized granulite-facies gabbroic anorthosites. In the eclogite facies, metabasaltic rocks contain the characteristic assemblage of omphacitic pyroxene + almandine-pyrope-grossular garnet, creating dense, beautiful green and red rocks (Table 1).Plagioclase is not present in the eclogite facies rocks due to his stability. The eclogite-bearing quartzofeldspathic schists form a 30 by 6 kilometer thick, northwest-striking, coherent package. The schists consist of metasediments and felsic intrusives that are intercalated on the tens of meter scale.

The mafic rocks preserve evidence of a precursor eclogite-facies mineral assemblage containing garnet, omphacite, amphibole, quartz and rutile. Mineral equilibria forward modelling and Zr-in-rutile thermometry indicate that the eclogite assemblage records peak pressure-temperature conditions of 16–18 kbar and 675–760 °C. In the eclogite facies, metabasaltic rocks contain the characteristic assemblage of omphacitic pyroxene + almandine-pyrope-grossular garnet, creating dense, beautiful green and red rocks (Table 1).Plagioclase is not present in the eclogite facies rocks due to his stability. About Eclogite Hide A high P/T metamorphic rock composed of more than 75% vol.
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eclogite facies. [ ′ek·lə‚jīt ‚fā·shēz] (petrology) A type of facies composed of eclogite and formed by regional metamorphism at extremely high temperature and pressure. McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc. Eclogite facies is determined by the temperature and pressure conditions required to metamorphose basaltic rocks to an eclogite assemblage.

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In the eclogite facies, metabasaltic rocks contain the characteristic assemblage of omphacitic pyroxene + almandine-pyrope-grossular garnet, creating dense, beautiful green and red rocks (Table 1).Plagioclase is not present in the eclogite facies rocks due to his stability. The eclogite-bearing quartzofeldspathic schists form a 30 by 6 kilometer thick, northwest-striking, coherent package. The schists consist of metasediments and felsic intrusives that are intercalated on the tens of meter scale. The eclogite facies is defined as a facies, in which the assemblages garnet + clinopyroxene + quartz and kyanite + clinopyroxene are stable in rocks with high Mg / Fe ratio.