References of "Namur, Olivier"
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See detailMagma storage conditions and processes at Calbuco volcano (Central Southern Volcanic Zone, Chile)
Montalbano, Salvatrice ULiege; Namur, Olivier ULiege; Schiano, Pierre et al

Poster (2017, August 16)

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See detailCompositional gap at La Picada (CSVZ, Chile) results from critical cristallinity and compaction
Vander Auwera, Jacqueline ULiege; Namur, Olivier ULiege; Coumont, Valentin et al

Poster (2017, August 16)

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See detailSilicate mineralogy at the surface of Mercury
Namur, Olivier ULiege; Charlier, Bernard ULiege

in Nature Geoscience (2017)

NASA’s MESSENGER spacecraft has revealed geochemical diversity across Mercury’s volcanic crust. Near-infrared to ultraviolet spectra and images have provided evidence for the Fe2+-poor nature of silicate ... [more ▼]

NASA’s MESSENGER spacecraft has revealed geochemical diversity across Mercury’s volcanic crust. Near-infrared to ultraviolet spectra and images have provided evidence for the Fe2+-poor nature of silicate minerals, magnesium sulfide minerals in hollows and a darkening component attributed to graphite, but existing spectral data is insufficient to build a mineralogical map for the planet. Here we investigate the mineralogical variability of silicates in Mercury’s crust using crystallization experiments on magmas with compositions and under reducing conditions expected for Mercury. We find a common crystallization sequence consisting of olivine, plagioclase, pyroxenes and tridymite for all magmas tested. Depending on the cooling rate, we suggest that lavas on Mercury are either fully crystallized or made of a glassy matrix with phenocrysts. Combining the experimental results with geochemical mapping, we can identify several mineralogical provinces: the Northern Volcanic Plains and Smooth Plains, dominated by plagioclase, the High-Mg province, strongly dominated by forsterite, and the Intermediate Plains, comprised of forsterite, plagioclase and enstatite. This implies a temporal evolution of the mineralogy from the oldest lavas, dominated by mafic minerals, to the youngest lavas, dominated by plagioclase, consistent with progressive shallowing and decreasing degree of mantle melting over time. [less ▲]

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See detailCrystallization history of enriched shergottites from Fe and Mg isotope fractionation in olivine megacrysts
Collinet, Max; Charlier, Bernard ULiege; Namur, Olivier ULiege et al

in Geochimica et Cosmochimica Acta (2017), 207

Martian meteorites are the only samples available from the surface of Mars. Among them, olivine-phyric shergottites are basalts containing large zoned olivine crystals with highly magnesian cores (Fo ... [more ▼]

Martian meteorites are the only samples available from the surface of Mars. Among them, olivine-phyric shergottites are basalts containing large zoned olivine crystals with highly magnesian cores (Fo 70–85) and rims richer in Fe (Fo 45–60). The Northwest Africa 1068 meteorite is one of the most primitive “enriched” shergottites (high initial 87Sr/86Sr and low initial ε143Nd). It contains olivine crystals as magnesian as Fo 77 and is a major source of information to constrain the composition of the parental melt, the composition and depth of the mantle source, and the cooling and crystallization history of one of the younger magmatic events on Mars (∼180 Ma). In this study, Fe-Mg isotope profiles analyzed in situ by femtosecond-laser ablation MC-ICP-MS are combined with compositional profiles of major and trace elements in olivine megacrysts. The cores of olivine megacrysts are enriched in light Fe isotopes (δ56FeIRMM-14 = −0.6 to −0.9‰) and heavy Mg isotopes (δ26MgDSM-3 = 0–0.2‰) relative to megacryst rims and to the bulk martian isotopic composition (δ56Fe = 0 ± 0.05‰, δ26Mg = −0.27 ± 0.04‰). The flat forsterite profiles of megacryst cores associated with anti-correlated fractionation of Fe-Mg isotopes indicate that these elements have been rehomogenized by diffusion at high temperature. We present a 1-D model of simultaneous diffusion and crystal growth that reproduces the observed element and isotope profiles. The simulation results suggest that the cooling rate during megacryst core crystallization was slow (43 ± 21 °C/year), and consistent with pooling in a deep crustal magma chamber. The megacryst rims then crystallized 1–2 orders of magnitude faster during magma transport toward the shallower site of final emplacement. Megacryst cores had a forsterite content 3.2 ± 1.5 mol% higher than their current composition and some were in equilibrium with the whole-rock composition of NWA 1068 (Fo 80 ± 1.5). NWA 1068 composition is thus close to a primary melt (i.e. in equilibrium with the mantle) from which other enriched shergottites derived. [less ▲]

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See detailA mineralogical and microstructural study of 7 eucrites (A-881394, Y-791195, Y-981617, Y-790266, Y-791186, Y-792510, Y-793591)
Foucart, Hélène ULiege; Holness, Marian; Namur, Olivier ULiege et al

Conference (2012)

The mineral chemistry and the detailed microstructure of seven eucrites (A-881394, Y-791195, Y-981617, Y-790266, Y-791186, Y-792510 and Y-793591) of the NIPR collection of Antarctic meteorites have been ... [more ▼]

The mineral chemistry and the detailed microstructure of seven eucrites (A-881394, Y-791195, Y-981617, Y-790266, Y-791186, Y-792510 and Y-793591) of the NIPR collection of Antarctic meteorites have been examined in order to constrain their modal mineralogy and chemistry and to explore the potential of microstructural analysis as a new tool for interpreting meteorites. [less ▲]

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See detailPrediction of plagioclase-melt equilibria in anhydrous silicate melts at 1 atm
Namur, Olivier ULiege; Charlier, Bernard ULiege; Toplis, Michael et al

in Contributions to Mineralogy & Petrology (2012), 163

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See detailDifferentiation of tholeiitic basalt to A-type granite in the Sept Iles layered intrusion, Canada
Namur, Olivier ULiege; Charlier, Bernard; Toplis, Michael et al

in Journal of Petrology (2011)

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See detailAnorthosite formation by plagioclase flotation in ferrobasalt and implications for the lunar crust
Namur, Olivier ULiege; Charlier, Bernard ULiege; Pirard, Cassian et al

in Geochimica et Cosmochimica Acta (2011), 75

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See detailCrystallization sequence and magma chamber processes in the ferrobasaltic Sept Iles layered intrusion, Canada
Namur, Olivier ULiege; Charlier, Bernard ULiege; Toplis, Michael et al

in Journal of Petrology (2010), 51

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See detailA-type granite of the ferrobasaltic Sept Iles layered intrusion: a product of large-scale silicate liquid immiscibility
Charlier, Bernard ULiege; Namur, Olivier ULiege; Schiano, P. et al

in EOS : Transactions, American Geophysical Union (2009), 90(52), 14-06

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See detailTi substitution mechanisms in phlogopites from the Suwalki massif-type anorthosite, NE Poland
Namur, Olivier ULiege; Hatert, Frédéric ULiege; Grandjean, Fernande ULiege et al

in European Journal of Mineralogy (2009), 21

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See detailCumulate origin and polybaric crystallization of Fe-Ti oxide ores in the Suwalki anorthosite, northeastern Poland
Charlier, Bernard ULiege; Namur, Olivier ULiege; Duchesne, Jean Clair et al

in Economic Geology (2009), 104

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See detailThe Sept Iles mafic layered intrusion; an example of ferrobasaltic differentiation
Namur, Olivier ULiege; Charlier, Bernard ULiege; Higgins, Michael et al

in Geochimica et Cosmochimica Acta (2007), 71(15S), 705

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See detailThe marginal gabbro of the Sept Iles intrusive suite (Quebec): constraints on the parent magma composition of the mafic layered intrusion
Namur, Olivier ULiege; Charlier, Bernard ULiege; Higgins, Michael et al

in Geologica Belgica (2006), 10(3-4), 207-208

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