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| Slab-derived osmium and isotopic disequilibrium in garnet pyroxenites from a Paleozoic convergent plate $...(350 Ma) of cumulate garnet pyroxenites enclosed in high-temperature peridotite massifs from a Paleozoic...isotopic compositions and negative Eu anomalies in plagioclase-free pyroxenites indicate that the Os was derived...indicating compatible behavior during pyroxene and garnet fractionation, likely because of coprecipitating...interaction with peridotite. D 2004 Elsevier B.V. All rights reserved. Keywords: Rhenium – Osmium; Garnet pyroxenites; |
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| crystallization vs. recrystallization origin of garnet pyroxenite-eclogite within subduction related lithologies...displaying transition between clinopyroxenite and eclogite within peridotite from felsic granulite in the...metamorphism. The selected mafic layer for this study is represented by garnet with omphacite in the core of...clinopyroxene in the matrix is diopside. In addition, garnet contains inclusions of omphacite, alkali feldspars...along with compositional zoning in garnet from the clinopyroxenite-eclogite layers favour solid-state |
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| homepage: www.elsevier.com/locate/epsl Garnet clinopyroxenite layers from the mantle sequences of the...This study aims to define the origin of garnet clinopyroxenite layers from the mantle sequences of the...exposed at a Jurassic ocean–continent transition. The garnet clinopyroxenites are mafic rocks with Mg# values...whole-rock REE variations are paralleled by the garnet REE compositions. We attribute the major and trace...trace element characteristics of the garnet clinopyroxenites to recycling of gabbroic protoliths that |
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| (Morocco) MICHEL LOUBET and CLAUDE J. ALLEGRE peridotite des Sciences de la Terre, Laboratoire de Geochimie...discuss the genesis of such massifs and because the peridotite and pyroxenite layers composi tions and types...outer sublayers and grades to an inner garnet clinopyroxenite through an inter mediate zone of websterite...compositions found in the sublayers of the complex layer can also form simple layers. The samples analyzed...gt cpx+gt (+sp) GARNET COMPLEX WEBSTERITE WEBSTERITE - z GARNET ~' *GARNET CLING PYROXENITE |
 | Downes, H., Bodinier, J.-L., Thirlwall, M. F., Lorand, J.-P., Fabries, J. (1991) REE and Sr-Nd Isotopic Geochemistry of Eastern Pyrenean Peridotite Massifs: Sub-Continental Lithospheric Mantle Modified by Continental Magmatism. Journal of Petrology, Special_Volume (2) 97-115 doi:10.1093/petrology/special_volume.2.97 | Journal (article/letter/editorial) |
| Sr-Nd Isotopic Geochemistry of Eastern Pyrenean Peridotite Massifs: Sub-Continental Lithospheric Mantle...segregates from tholeiitic magmas. Clinopyroxenes from garnet clinopyroxenites have bell-shaped REE patterns...basaltic magmas which have reacted with pre-existing peridotite. The metasomatism of the Caussou massif is also...E S ET AL. EASTERN PYRENEAN PERIDOTITE MASSIFS The Pyrenean peridotite massifs are tectonic ultramafic...of foliated spinel lherzolites, with spinel and garnet pyroxenites defining a layering concordant to foliation |
 | Zhao, Ruixuan, Liou, Juhn G., Tsujimori, Tatsuki, Zhang, Ru Y. (2007) Petrology and U-Pb SHRIMP Geochronology of a Garnet Peridotite, Sulu UHP Terrane, East-Central China. International Geology Review, 49 (8) 732-752 doi:10.2747/0020-6814.49.8.732 | Journal (article/letter/editorial) |
| Petrology and U-Pb SHRIMP Geochronology of a Garnet Peridotite, Sulu UHP Terrane, East-Central China a a...Petrology and U-Pb SHRIMP Geochronology of a Garnet Peridotite, Sulu UHP Terrane, East-Central China, International...Petrology and U-Pb SHRIMP Geochronology of a Garnet Peridotite, Sulu UHP Terrane, East-Central China RUIXUAN...Tasmania] at 04:27 16 January 2015 Abstract Garnet clinopyroxenite at Rizhao occurs as a lens 100 × 225 m2...m2 within a serpentinized peridotite body, in fault contact with felsic gneiss. Minor dunite also occurs |
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| of the mafic and ultramafic rocks in the Ronda peridotite C.J. Suen i.. a n d F.A. Frey 2 i Department...revised version accepted June 15, 1987 The Ronda peridotite massif in southern Spain originated from the...their origin as residues from partial melting of garnet lherzolite. About 5% of the massif consists of...clinopyroxene + orthopyroxene + spinel and clinopyroxene + garnet) along the walls of the conduits which are now...the mafic layers. 1. Introduction The Ronda peridotite massif in southern Spain is a large exposure |
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| Clinopyroxenes derived from peridotites of the spinel and garnet facies of the Ronda Ultramafic Complex yield Sr...to be ubiquitous throughout the massif. In the garnet facies, some of these variations are shown to be...in an isotopically depleted peridotite matrix. Ages obtained from garnet-clinopyroxene Sm-Nd isochrons...determinations of the time of crustal emplacement. In the plagioclase facies, where the Sr and Nd isotopic compositions...exists between clinopyroxene, orthopyroxene, and plagioclase. This indicates that the metasomatism occurred |
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| and osmium isotopic study of a thick pyroxenite layer from the Beni Bousera Ultramafic Complex of northern...pyroxenite layer from the Beni Bousera massif. The two main rock types included in the layer, garnet pyroxenites...are, in most respects, more refractory than the garnet pyroxenites, but, surprisingly, are more enriched...characteristics can be explained by formation of the layer by crystal deposition along a magma conduit at medium...age of formation of the layer. In contrast, Sm-Nd model ages from the layer are mutually conflicting |
 | Pearson, D.G., Davies, G.R., Nixon, P.H., Greenwood, P.B., Mattey, D.P. (1991) Oxygen isotope evidence for the origin of pyroxenites in the Beni Bousera peridotite massif, North Morocco: derivation from subducted oceanic lithosphere. Earth and Planetary Science Letters, 102 (3) 289-301 doi:10.1016/0012-821x(91)90024-c | Journal (article/letter/editorial) |
| the origin of pyroxenites in the Beni Bousera peridotite massif, North Morocco" derivation from subducted...pseudomorphs after diamond, in the Beni Bousera peridotite massif show marked oxygen isotope heterogeneity...values (+ 5.3 to + 6.1%o). Coexisting clinopyroxene-garnet and clinopyroxene-orthopyroxene mineral pairs from...stability field. 1. Introduction The Beni Bousera peridotite massif, is situated in the Rif Mountains of North...forms part of a SE-plunging antiform surrounded by garnet-sillimanite gneisses. Spinel lherzolite is the |
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| Diamond Fades Pyroxenites from the Beni Bousera Peridotite Massif, North Morocco Department of Earth Sciences...of pyroxenite layers within the Beni Bousera peridotite massif is investigated by means of elemental...crystallized clinopyroxene, orthopyroxene, and garnet. The pressure of crystallization is constrained...crystallized at pressures much greater than the plagioclase stability field (~ 45 kbar) suggests that the...extensive sample suite from the Beni Bousera peridotite massif, to place more stringent constraints on |
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| deck, consists of garnet-kyanite quartzofeldspathic gneiss, mafic two-pyroxene garnet granulite, and a...10–15 m-thick layer of eclogitic HIGH P–T GRANULITES IN THE SNOWBIRD TECTONIC ZONE 83 garnet clinopyroxenite...Godfrey granite (Fig. 2). of eclogitic garnet clinopyroxenite and associated sapphirine granulites which...been mapped along strike for c. 15 km (Fig. 2). Garnet–clinopyroxene exchange thermometry yields 950–1000...deformation occurred in the high pressure granulite field (garnet + clinopyroxene + quartz; 1.4–1.2 GPa at 750–800 |
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| 27100 Pavia, Italy record the infiltration of plagioclase-saturated hydrous melts, most likely evolved...and is locally characterised by the occurrence of garnet pyroxenite layers. A Lu–Hf whole 123 Contrib...isochron of 220 ± 13 Ma obtained for a garnet clinopyroxenite layer (Montanini et al. 2006) was interpreted...to date a nearly-isothermal decompression to plagioclase-facies conditions, probably in conjunction with...orthopyroxene, clinopyroxene and spinel as olivine ? plagioclase reaction products. The Fe-rich protoliths are |
