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102 results on '"Bodinier, J. L."'

2. Petrology and geochemistry of a cumulate xenolith suite from Bute: evidence for late Palaeozoic crustal underplating beneath SW Scotland

Author

Downes, H., Upton, B.G.J., Connolly, J., Beard, A.D., and Bodinier, J.-L.

Subjects
Bute (Island) -- Natural history, Petrology -- Research, Geochemistry -- Research, Rocks, Igneous -- Inclusions, Rocks, Igneous -- Properties, Rocks, Igneous -- Composition, Earth sciences
Abstract

Xenoliths from Hawk's Nib (Bute, SW Scotland), entrained in alkali basalt of late Carboniferous early Permian age, generally possess unrecrystallized igneous cumulate textures. Most are inferred to derive from lower crustal (20-30 km) depths, with a small minority from the underlying restitic mantle. Compositions range from ultramafic cumulates (dunite, wehrlite, websterite, clinopyroxenite) to gabbros and anorthosites. The suite is unique in being dominated by poikilitic wehrlites and olivine clinopyroxenites. Major element variation in the cumulates is controlled by modal mineral variations. The ultramafic cumulates all have high REE contents and light REE (LREE)-enriched patterns, with websterites being the least enriched. Gabbroic xenoliths have uniform patterns in which both LREE and heavy REE are depleted relative to the middle REE, with small positive Eu anomalies. Present-day Sr-Nd isotopic data for the suite are the most depleted among Scottish xenoliths. The xenoliths are inferred to be products of young replenishments of the lower crust by basaltic magmas during continental underplating. Orthopyroxene-bearing lithologies crystallized from tholeiitic magmas whereas alkali basalts formed the elinopyroxene-rich samples; both parental magma-types were derived from similar mantle sources.

Published
2007

12. Translithospheric Mantle Diapirism: Geological Evidence and Numerical Modelling of the Kondyor Zoned Ultramafic Complex (Russian Far-East)

Author

Burg, J.-P, Bodinier, J.-L, Gerya, T., Bedini, R.-M, Boudier, F., Dautria, J.-M, Prikhodko, V., Efimov, A., Pupier, E., Balanec, J.-L, Burg, J.-P, Bodinier, J.-L, Gerya, T., Bedini, R.-M, Boudier, F., Dautria, J.-M, Prikhodko, V., Efimov, A., Pupier, E., and Balanec, J.-L

Abstract

We report new structural, microstructural, petrological, and major- and trace-element data on ultramafic rocks from the Kondyor zoned ultramafic complex in Far-East Russia. The ultramafic rocks are subdivided into three subconcentric lithologies, from core to rim: (1) a metasomatic domain where generally phlogopite-rich dykes pervasively intrude dunite; (2) a main dunite core; (3) a pyroxenite rim. The ultramafic rocks have nearly vertical contacts with the surrounding Archaean basement (gneisses, quartzites and marbles) and hornfelsed Riphean sediments. The hornfelsed sediments show a relatively steep (> 60°), outward dipping layering, which rapidly flattens to horizontal away from the inner contact. Although the Riphean sediments define a dome-like structure, the inward, shallow dipping foliation of the dunites indicates a synformal structure. Detailed petro-structural investigations indicate that the Kondyor dunites were deformed by solid-state flow under asthenospheric mantle conditions. The outward textural change from coarse- to fine-grained equigranular dunite and the outward-increasing abundance of subgrains and recrystallized olivine grains suggest dynamic recrystallization while fluid circulation was channelized within the core metasomatic zone, with a decreasing melt fraction from core to rim, and also suggest that solid-state deformation induced grain-size reduction towards the cooling border of the Kondyor massif. Based on their geochemistry, the dunites are interpreted as mantle rocks strongly affected by reaction with melts similar to the Jurassic-Cretaceous Aldan Shield lamproites. Rim pyroxenites were formed by a melt-consuming peritectic reaction, implying the existence of at least a small, conductive thermal gradient around the dunite body while the latter was still at near-solidus temperature conditions. This suggests that the zoned structure of Kondyor was initiated at mantle depths, most probably within the subcontinental lithosphere. Upon cool

Published
2017

26. Chapter 2.04: Orogenic, Ophiolitic, and Abyssal Peridotites.

Author

Bodinier, J.-L. and Godard, M.

Abstract

Chapter 4 of the book "Treatise on Geochemistry: The Mantle and the Core," Volume 2, is presented. The chapter focuses on orogenic, ophiolitiv and abyssal peridotites. It also explores the geochemistry of peridotites and pyrozenites. It present information on trace elements, isotope geochemistry and transition elements.

Published
2005

32. Preface

Author

Menzies, M.A., primary, Bodinier, J.-L., additional, Frey, F.A., additional, Gervilla, F., additional, and Kelemen, P.B., additional

Published
1996
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43. Geochemistry of spinel peridotite inclusions in basalts from Sardinia

Author

Dupuy, C., Dostal, J., and Bodinier, J. L.

Abstract

AbstractThe spinel peridotite inclusions in basalts from Sardinia are upper-mantle residues affected by metasomatism which led to an enrichment particularly of U and light REE. The metasomatism took place prior to the recrystallization which produced the primary mineral assemblage of the inclusions. The compositional variations imply that the xenoliths are residual after at least two melting events.

Published
1987
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46. Silicate, hydrous and carbonate metasomatism at Lherz, France: Contemporaneous derivatives of silicate melt-harzburgite reaction

Author

Bodinier, J. -L, Menzies, M. A., Shimizu, N., Frederick Frey, and Mcpherson, E.

Subjects
Peridotite, Provenance, mantle metasomatism, trace-element enrichment, isotopic contamination, wall-rock peridotite, Lherz peridotite, Outcrop, Geochemistry, Mantle (geology), Silicate, chemistry.chemical_compound, Geophysics, chemistry, Geochemistry and Petrology, Faculty of Science\Earth Sciences, Carbonate, Xenolith, Metasomatism, Geology
Abstract

Complex multi-stage models involving silicate, hydrous and carbonate melts of distinct provenance have been invoked to explain the metasomatism observed in mantle rocks. In contrast, relatively simple models requiring polybaric crystallization of alkaline silicate melts have been proposed to explain the occurrence of veined mantle rocks. To address the spatial and temporal relationships between veins and wall-rocks, a sequence of drill cores was obtained from Lherz, France. In outcrop the vein (amphibole---garnet pyroxenite dyke) is spatially associated with hornblendite veinlets (lherzite), and proximal amphibole-bearing and distal apatite-bearing wall-rock peridotite. Considerable elemental and isotopic heterogeneity exists in these wall-rock peridotites, in many instances equivalent to, or greater than, that observed in mantle xenoliths from worldwide localities. A single stage of reactive porous flow best explains the elemental and isotopic heterogeneity in the wall-rock. In essence it is proposed that emplacement of the silicate melt (dyke) was inextricably linked to chromatographic fractionation/reaction of derivatives which led to the coexistence, in space and time, of silicate, hydrous and carbonate melts. This model elegantly and simply describes the formation of complex metasomatic aureoles around mantle veins and negates the need, in the case of basalt-hosted (and kimberlite-hosted) xenoliths, for complex multi-stage models involving several episodes of melt influx with each melt being of different provenance.

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