Eclogite facies metamorphism of the lithosphere forms dense mineral assemblages at high- (1.6–2.4 GPa) to ultra-high-pressure (>2.4–12 GPa: UHP) conditions that drive slab-pull forces during

450-550 o C. Conclusively, the Lower Seve Nappe was metamorphosed in upper greenschist-amphibolite to lower eclogite facies conditions at depths around

The importance of water in eclo-gite metamorphism is illustrated by a complex of partly eclogitized maﬁc granulites in 2021-04-08 · Our work on these eclogites and their enclosing gneisses includes: (1) Detailed mapping (1:24,000) to determine the distribution of eclogite facies rocks and their enclosing gneisses selected quadrangles, (2) Calculation of paleo P-T-t paths based on chemical zonations in the primary mineral phases, retrograde mineral compositions, and on mineral inclusions in garnet; search for possible ultra Eclogite is an unusually dense metamorphic rock, typically of basaltic composition, that represents a recorder and/or driving force for planetary-scale processes and evolution. Eclogite-facies metamorphic conditions encompass a wide range of pressure–temperature space from deep crustal to mantle depths, reflecting tectonic setting. 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. The typical eclogite mineral assemblage is garnet (pyrope to almandine) plus clinopyroxene (omphacite).

Importance of eclogite [ edit ] Photomicrograph of a thin section of eclogite from Turkey. 2021-04-15 · The eclogite facies was initially recognized in rocks only of basaltic composition, which are transformed at the pressure-temperature conditions of the eclogite facies into spectacular red and green rocks composed of the anhydrous mineral assemblage garnet plus omphacite. The garnet is rich in…. Read More. It is a rock type that gave name to a metamorphic facies.

In metamorphic rock: Eclogite facies The eclogite facies was initially recognized in rocks only of basaltic composition, which are transformed at the pressure-temperature conditions of the eclogite facies into spectacular red and green rocks composed of the anhydrous mineral assemblage garnet plus omphacite. The garnet is rich in…

6 B). reaching eclogite facies pressures. Because rapid eclogitization is dependent on water as a medium for advective ion transport, the very shallow dehydration in the Archean may have inhibited the formation of eclogite facies minerals. The importance of water in eclo-gite metamorphism is illustrated by a complex of partly eclogitized maﬁc granulites in 2021-04-08 · Our work on these eclogites and their enclosing gneisses includes: (1) Detailed mapping (1:24,000) to determine the distribution of eclogite facies rocks and their enclosing gneisses selected quadrangles, (2) Calculation of paleo P-T-t paths based on chemical zonations in the primary mineral phases, retrograde mineral compositions, and on mineral inclusions in garnet; search for possible ultra Eclogite is an unusually dense metamorphic rock, typically of basaltic composition, that represents a recorder and/or driving force for planetary-scale processes and evolution.

Read Online Eclogite Facies Rocks and Download Eclogite Facies Rocks book full in PDF formats.

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.

Eclogite facies is determined by the temperature and pressure conditions required to metamorphose basaltic rocks to an eclogite assemblage. The typical eclogite mineral assemblage is garnet (pyrope to almandine) plus clinopyroxene (omphacite). Eclogite facies The eclogite facies was initially recognized in rocks only of basaltic composition, which are transformed at the pressure-temperature conditions of the eclogite facies into spectacular red and green rocks composed of the anhydrous mineral assemblage garnet plus omphacite. In the geological record, eclogite-facies rocks are irrefutable indicators of subduction and collisional orogenesis, yet occurrences of eclogites in the ancient Earth (> 1.5 Ga) are rare. 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.
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In the geological record, eclogite-facies rocks are irrefutable indicators of subduction and collisional orogenesis, yet occurrences of eclogites in the ancient Earth (> 1.5 Ga) are rare. A coarse-grained greenish rock consisting primarily of garnet and sodic pyroxene, and often including quartz, kyanite, and rutile. [French éclogite, from Greek eklogē, selection (because the minerals it contains are not usually found together); see eclogue.] American Heritage® Dictionary of the English Language, Fifth Edition. The mafic rocks preserve evidence of a precursor eclogite-facies mineral assemblage containing garnet, omphacite, amphibole, quartz and rutile.

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). Indosinian epoch collsional orogenic belt in the Lhasa terrane, Tibet: geochronology, distribution and evolution The granulite-facies rocks show partial conversion to eclogite, but there are areas in excess of several hundred square meters where the granulite is preserved with no eclogite-facies overprint.
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21 Feb 2012 Rocks in and adjacent to the RISZ contain S2 amphibolite facies assemblages involving hornblende, plagioclase, clinozoisite, ilmenite and quartz

In the geological record, eclogite-facies rocks are irrefutable indicators of subduction and collisional orogenesis, yet occurrences of eclogites in the ancient Earth (> 1.5 Ga) are rare. eclogite facies A set of metamorphic mineral assemblages produced by metamorphism of basic igneous rocks under high-pressure, moderate-temperature conditions and typically characterized by the development of the mineral assemblage pyrope garnet and omphacite (an Na-rich, high-pressure pyroxene). The eclogites are usually encountered as bands or lenses in crystalline complexes belonging to the granulite, amphibolite or the lawsonite-glaucophane facies; often appearing as if they have been tectonically squeezed into an alien environment.