 | Carswell, D. A., Brueckner, H. K., Cuthbert, S. J., Mehta, K., O'Brien, P. J. (2003) The timing of stabilisation and the exhumation rate for ultra-high pressure rocks in the Western Gneiss Region of Norway. Journal of Metamorphic Geology, 21 (6) 601-612 doi:10.1046/j.1525-1314.2003.00467.x | Journal (article/letter/editorial) |
| pressure rocks in the Western Gneiss Region of Norway D. A. CARSWELL,1 H. K. BRUECKNER,2,3 S. J. CUTHBERT...(UHP) eclogites within the Western Gneiss Region of Norway probably occurred within the 400–410 Ma time frame...firstly amphibolite facies then quartz-stable, eclogite facies conditions. Currently, the best constrained...retain coesite inclusions) from the Hareidland eclogite. Exhumation must have followed shortly thereafter...pressure (UHP); Norway. INTRODUCTION The Western Gneiss Region (WGR) of western Norway comprises a large |
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| Žwestern Italian Alps. underwent a stage of Alpine eclogite-facies metamorphism Ž1.1–1.3 GPa and 450–5508C...reserved. Keywords: Subduction; Continental crust; Eclogite; Eclogitized granulite; Fluid inclusions; Brines;...msca@dister.unige.it. The study of fluid inclusions in eclogite-facies rocks allows direct insight on the chemistry...recrystallization of the Mt. Emilius unit under eclogite-facies conditions ŽCompagnoni et al., 1977; Dal...Mt. Emilius unit consists of garnet–biotite–sillimanite paragneisses associated with mafic granulites |
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| preserved in the geologic record, particularly in eclogite. Therefore, scarce fresh lawsonite eclogites in...comprised of ~30-50% lawsonite occur at pod margins where lawsonite eclogite has been partially transformed to...layer at the margin of a meter-scale lawsonite eclogite pod. Bulk rock and mineral major and trace element...(Gln + Grt + Lws + Ph + Rt), and the lawsonite eclogite host at varying distances from the layer (~1 –...away). The bulk-rock composition of the lawsonite eclogite indicates a basaltic protolith that experienced |
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| Orthopyroxene Eclogite Pods from the Basal Gneisses in the Selje District, Western Norway by M. A. LAPPIN...Geological Survey of Norway, P.O. Box 3006, 7001 Trondheim, Norway ABSTRACT 'Country-rock eclogite' pods occur...gneisses in the Basal Gneiss Region of Western Norway. Sixty-nine new microprobe analyses for garnets...and carbonates from a number of orthopyroxene eclogite pods in the Selje District are presented.The first...formed during a subsequent but still early stage in eclogite history. The primary minerals have a wider range |
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| Minerals of Norway - the (almost) complete inventory Gunnar Raade Preamble A monographic survey of the...the minerals of Norway (Norges Mineraler) was published by Neumann (1985), covering all minerals recorded...and synonyms. A large number of minerals new to Norway have been recorded since the book appeared. The...attempt to list all accepted mineral species from Norway, including those from Neumann (1985) and later...& Nickel 2001). Names of minerals discovered in Norway after the edition of Neumann's monograph are in |
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| www.elsevier.nlrlocaterlithos A possible UHP-eclogite in the Leaota Mts. žSouth Carpathians / and its...RO-78344 Bucharest 32, Romania Abstract An unusual eclogite pod containing impure jadeite to omphacite pyroxene...effective mechanism in detaching and enclosing small eclogite pods in metamorphic terrains. q 2000 Elsevier...and Dinica, ˘ 1997, unpublished manuscript. with eclogite locations. G. Sabaur ˘ ˘ Lithos 52 (2000) 253–276...containing subordinate marbles and quartzites. Several eclogite blocks embedded in this matrix were described |
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| Lawsonite eclogite pods ranging in size from 3 cm to 6 m occur in lawsonite blueschist and eclogite facies...lawsonite eclogite surrounded by alternating, centimeter-scale layers of lawsonite blueschist, eclogite, and...and transitional eclogite– blueschist, all with similar basaltic bulk composition. These pods also contain...lack reaction textures, but some blueschists near pod margins contain texturally complex garnet as well...of eclogite to blueschist. Phase diagrams (pseudosections) calculated for the lawsonite eclogite core |
 | Klonowska, I., Janák, M., Majka, J., Petrík, I., Froitzheim, N., Gee, D. G., Sasinková, V. (2017) Microdiamond on Åreskutan confirms regional UHP metamorphism in the Seve Nappe Complex of the Scandinavian Caledonides. Journal of Metamorphic Geology, 35 (5) 541-564 doi:10.1111/jmg.12244 | Journal (article/letter/editorial) |
| Mgpoor garnet+biotite+ plagioclase+K-feldspar+sillimanite+ilmenite+quartz. This overprint was the result...mineral assemblages that do not correspond to the eclogite facies but record lower pressure conditions. Often...garnet formed in quartzofeldspathic rocks under eclogite facies conditions may survive even severe retrogression...mountain belt in the Tromsø Nappe, in northern Norway (Ravna & Roux, 2006; Janák et al., 2012, 2013a)...hinterland, in the Western Gneiss Region of southwestern Norway (e.g. Smith, 1984; Dobrzhinetskaya et al., 1995; |
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| Time-Temperature Indicators of Blueschist- and Eclogite-Facies Metamorphism Michael A. Carpenter* Hoffman...indicators of thermal history for blueschist and eclogite metamorphism. In particular, the average size...metagabbro (4) < Tauern, eclogite (1) ~ Franciscan, eclogite (5)< Nyb6, Norway, eclogite (2) (numbers in brackets...occasionally up to 800 A. Omphacite crystals in 93620, an eclogite from Zermatt, have equiaxed APD's generally on...Exsolution 1. Alps (a) Tauern window 120853, eclogite 620_+30~ C 19.5 • Holland (I977), Holland (1979) |
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| if granulite facies rocks transform to denser eclogite facies during shortening, where the petrographic...combined with the resultant heating and eclogite to sillimanite-granulite/amphibolite transformation causes...southwestern Norway in which coherent regional-scale transformation of lower crustal rocks to eclogite facies...shortening is followed by heating, transformation of eclogite to amphibolite and granulite, extension, and crustal...model also explains strong lower crustal layering (eclogite and other lenses in horizontallyextended amphibolites) |
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| garnet omphacite-rutile-quartz in glaucophane eclogite and garnet-omphacite-zoisiterutile _+kyanite _+phengite..._+phengite _+ankerite in barroisite eclogite. Most samples contain a significant amount of amphibole...barroisite in most samples, but in relatively Fe-rich eclogite it is glaucophane with significant Na in the A...Kaghan nappe and metamorphic evolution of the eclogite-bearing units of the Neelum valley just to the...indicate that the eclogite occurrences of the Kaghan-Neelum area define an eclogite-bearing terrane of |
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| boudins and layers of amphibolite with relics of eclogite. Well-preserved eclogites crop out at the margin...quartz + garnet -+ staurolite -+ kyanite -+ sillimanite (fibrolite) -+ K-feldspar _+ amphibole; accessory...calcite has a composition 85% An (Wenk, 1962) and sillimanite is the typical aluminosilicate polymorph (Niggli...mass of Alpe Arami. They will be called hereafter eclogite s.s. They are fine-grained, light-green rocks...Alpe Arami--Gorduno eclogites and related rocks Eclogite Symplectitic amphibolites Garnet-bearing amphibolites |
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| to calculate metamorphic conditions for three eclogite localities. Using these reactions in conjunction...for eclogite-facies mica schists from the Tauern Window, Austria, and 46 kb and 850~ for eclogite-facies...E. Manning Introduction The high pressures of eclogite metamorphism have long attracted the attention...crustal lithologies that have been subjected to eclogite-facies metamorphic conditions (e.g., Schreyer...temperature eclogites. Recent studies indicate that eclogite-facies titanite may contain substantial concentrations |
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| supersilicic or subsilicic crystal-chemistry of eclogite minerals, and potential new UHPM pyroxene and...and lead to various exsolution phenomena during eclogite exhumation. iv 4þ Introduction Pyroxene fviii...AlP-garnet is not of interest in the context of eclogite facies metamorphism. It has long been known that...sanidine ‘‘subsiligar’’ spodumene serpentine sillimanite sphene spinel ‘‘supersiligar’’ spessartine stishovite...recorded, apparently for the first time, in an eclogite from Rendelven in S.E. Greenland by Smith and |
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| V., Amsterdam Amphibole evolution in Variscan eclogite-amphibolites from the Savona crystalline massif...Caucia, F., 1992. Amphibole evolution in Variscan eclogite-amphibolites from the Savona crystalline massif...27:215-230. The Variscan metamorphic evolution of eclogite-amphibolites from the Savona Crystalline Massif...evolution. A prograde stage of the evolution in the eclogite facies (temperature conditions estimated as ca...amphiboles reveal that the subsequent evolution in the eclogite facies contemplates a late re-equilibration under |
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| or more (Schreyer et al. 1984), and (3) Norway, in eclogite formed at pressures possibly as high as 30...is found with prismatic as well as fibrolitic sillimanite and muscovite. Kyanite relics are preserved in...experimental and theoretical curves: kyanite (Ky), sillimanite (Sil), and andalusite (And) (Holdaway 1971);...1971); muscovite (Ms) + quartz (Qtz) = sillimanite + K feldspar (Kfs) + H20 at mole fractions of water (XH2o)... garnet; CRD, cordierite; KY, kyanite; SIL, sillimanite; STA, staurolite; CHL, chlorite; and CDM, corundum |
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| using 40 Ar/39Ar phengite ages in blueschist‑ and eclogite‑facies rocks (Sivrihisar, Turkey) Katherine F...ages from a suite of lawsonite blueschist- and eclogite-facies rocks representing different protoliths...high-strain zone), and different textural positions (eclogite pod core vs. margin) to understand the timing of...40Ar/39Ar ages of phengite from the cores of lawsonite eclogite pods (90–93 Ma) are distinctly older than phengite...phengite from retrogressed, epidote eclogite (82 ± 2 Ma). These ages are interpreted as the age of peak |
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| magnesite in eclogites from the Jæren nappe, SW Norway: disequilibrium in the system CaCO3–MgCO3 and petrological...Jæren nappe in the Caledonian orogenic belt of SW Norway contain aragonite, magnesite and dolomite in quartz-rich...that occur interstitially between phases of the eclogite facies assemblage: garnet + omphacite + zoisite...Pressure and temperature conditions for the main eclogite stage are estimated to be 2.3–2.8 GPa and 585–655...result, recognition of magnesite and aragonite in eclogite facies rocks has been used as an indicator for |
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| Meta-anorthosite and related jotunites, Western Gneiss Region, Norway Spencer J. Cotkin Department of Geological Sciences...in the high-grade Western Gneiss Region (WGR) of Norway, and is adjacent to the 1.52 Ga Flat&et quartz...monzonite (mange&e). The WGR was metamorphosed to eclogite facies during Caledonian tectonism 414 &- 16 Ma...Seljeneset rocks display evidence of retrogression from eclogite through amphibolite facies. Meta-anorthosite consists...Mafic rocks vary from moderately well-preserved eclogite, through varieties containing symplectite, to |
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| equilibria such as almandine + rutile = ilmenite + sillimanite + quartz, garnet + quartz = ferrosilite + plagioclase...ilmenite + anorthite + quartz, and almandine + sillimanite = hercynite + quartz. An extensive survcy of...amphibolite and granulite facies give way to the eclogite facies over the pressure range of 12-16 kbar....almandine + rutile = ilmenite + kyanite or (5) sillimanite + quartz Fe3A12Si3012 + 3TIO2 = 3FeTiO3 + AI2SiO5...are reviewed in Essene (1982). 9 kyanite = sillimanite = andalusite Al2SiO5 = AI2SiO5 (Holdaway 1971 |
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| from a high-Al (Cr# of chromite ~0.4) chromitite pod of the Khoy meta-ophiolite in northwestern Iran....associated minerals fill cavities in the chromitite pod and are absent in the surrounding peridotites. The...formed during retrogressive metamorphism of the eclogite or amphibolite facies (Miller, 1990; 3 ACCEPTED...Allalinhorn, CE Switzerland (Meyer, 1983); Liset, Norway (Smith and Kechid, 1983); La Copointrie, AC Vedée... Guatemala (Harlow, 1994); Blengsvatn, Bamble, Norway (Visser et al., 1999); the Dabie UHP metamorphic |
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| metamorphic belt mainly consists of blueschist, eclogite and HP metasediments. Eclogites record metamorphic...SAT–NQD UHP metamorphic belt is characterized by eclogite and garnet peridotite enclosed within continental...the UHP metamorphism occurred at 500–423 Ma, and eclogite protolith ages of 850–750 Ma suggests protoliths...history and similar age to that IP T of UHP eclogite. Penecontemporaneous metamorphic ages but different...gradients between HP granulites and related UHP eclogite define a possible paired SC R metamorphic belt |
 | Di Vincenzo, G., Palmeri, R., Talarico, F., Andriessen, P.A.M., Ricci, G.A. (1997) Petrology and Geochronology of Eclogites from the Lanterman Range, Antarctica. Journal of Petrology, 38 (10) 1391-1417 doi:10.1093/petroj/38.10.1391 | Journal (article/letter/editorial) |
| remains unconstrained. In the well-preserved eclogite samples the reaction textures testify to three...three main metamorphic stages: (1) an eclogite facies stage, (2) a medium-pressure amphibolite facies stage...data place both the formation and exhumation of eclogite within a convergent plate margin setting, thus...chronology; eclogite; high-pressure metamorphism; Ross Orogen INTRODUCTION Metabasites with eclogite assemblages...38 during the high-pressure event (the in situ eclogite model) or whether the mafic eclogites were tectonically |
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| and the Western Gneiss Region of southwestern Norway all contain mineralogic/textural relics indicating...Western Alps, and the Western Gneiss Region of Norway. Figure 1 presents the global distribution of authenticated...farther north, greenschist, epidote amphibolite, and eclogite assemblages progressively replace lower-grade...1990; Zhang et al., 1994, 1995a). Blueschist + eclogite mineral parageneses, bulk-rock + phase chemistries...(Chopin, 1984) and in the Western Gneiss Region of Norway (Smith, 1984). Relict coesite finally was reported |
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| epidote–amphibolite facies progressing into the eclogite facies. Post-peak pressure reaction textures include...kelyphites. The replacement textures indicate that post-eclogite facies decompression took place while the rocks...evolution of the eclogites is in agreement with eclogite formation by thick-skinned crustal imbrication...exhumation to amphibolite facies by emplacement of the eclogite-bearing thrust sheet on the Laurentian margin...Elsevier Science B.V. All rights reserved. Keywords: Eclogite; P–T conditions; Symplectite; Sapphirine; Caledonian |
