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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...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;...1016/j.chemgeo.2004.04.009 Recent studies of peridotite xenoliths from convergent plate margins have |
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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 |
 | 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... although the dominant lithologies, spinel lherzolite and spinel websterite, are isotopically much more...clinopyroxenes from protogranular and porphyroclastic spinel lherzolites. These rocks have high eNd and low...segregates from tholeiitic magmas. Clinopyroxenes from garnet clinopyroxenites have bell-shaped REE patterns...pyroxenites generally have higher ^ values than spinel peridotites, and show a wide range of aNd, resulting |
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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...constitute the most important part of these massifs are spinel lherzolites, with the following approximative modal...nature pyroxene 19-21%, clinopyroxene 12-15%, spinel 3-5%. The pyroxenite layers display a large variety...outer sublayers and grades to an inner garnet clinopyroxenite through an inter mediate zone of websterite |
 | 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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| 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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| 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...(mainly clinopyroxene + orthopyroxene + spinel and clinopyroxene + garnet) along the walls of the conduits which...the mafic layers. 1. Introduction The Ronda peridotite massif in southern Spain is a large exposure |
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| Mineralogist, Volume 88, pages 1591–1600, 2003 Clinopyroxenite from the Sulu ultrahigh-pressure terrane, eastern...eastern China: Origin and evolution of garnet exsolution in clinopyroxene RU Y. ZHANG* AND JUHN G. LIOU...California 94305, U.S.A. ABSTRACT The Rizhao garnet clinopyroxenite occurs as small mantle slices faulted into...ultrahigh-pressure (UHP) terrane, China. Two representative garnet clinopyroxenites with exsolution microstructures...grossularrich garnet (>20 vol%) + ilmenite (~3–4 vol%) in a fine-grained matrix of clinopyroxene + garnet + ilmenite; |
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| Clinopyroxenes derived from peridotites of the spinel and garnet facies of the Ronda Ultramafic Complex yield...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... culminating in a kinzigite layer immediately adjacent to the peridotite [11,12,16,17]. The second phase...fault dipping at an angle of 5-15 o beneath the peridotite [14]. The age of crustal emplacement has been |
 | 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...SE-plunging antiform surrounded by garnet-sillimanite gneisses. Spinel lherzolite is the dominant lithology |
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| peridotites were studied in garnet- and spinel-bearing high-temperature peridotite bodies in the southern...and the trace element and isotopic composition of garnet pyroxenite layers in the peridotites indicate that...Devonian^early Carboniferous subduction zone. The garnet pyroxenites are cumulates and their Eu anomalies...However, in some recent studies of lithospheric peridotite xenoliths, model age results cannot be related...the interaction with melt or £uid. Studies of peridotite xenoliths from convergent plate margins yielded |
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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 |
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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...extensive sample suite from the Beni Bousera peridotite massif, to place more stringent constraints on...July 10, 2014 The large dimensions of orogenic peridotite massifs allow in situ study of mantle compositions |
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| November 2008 Ó Springer-Verlag 2008 Abstract Spinel pyroxenites occur locally as clasts in polygenic...olivine and late crystallisation of orthopyroxene, spinel, Ti-pargasite and sulphides. Pyroxenites underwent...clinopyroxene, orthopyroxene, Ti-pargasite and spinel. U–Pb geochronology on zircons revealed the occurrence...Post-collisional magmatism Variscan evolution Introduction Spinel pyroxenites are present in lower crust gabbroic...pyroxenites are located near the crust–mantle boundary. Spinel pyroxenites were also found at deep levels of the |
