Showing results 1 to 20 of 26
  Anorthosite formation by plagioclase flotation in ferrobasalt and implications for the lunar crustNamur, Olivier  ; Charlier, Bernard ; et alin Geochimica et Cosmochimica Acta (2011), 75 Detailed reference viewed: 18 (2 ULg) Nd and Pb isotopic signatures of detrital fractions from Labrador Sea and Iceland Basin sediments: Deep oceanic circulation changes over the HoloceneFagel, Nathalie ; ; et alin Geochimica et Cosmochimica Acta (2008), 72(12), 251-251 Detailed reference viewed: 5 (0 ULg)Holocene records of regional dust deposition using peat bogs; ; et al in Geochimica et Cosmochimica Acta (2008), 72(12), 535-535 Detailed reference viewed: 12 (0 ULg) Spatial and temporal (30 yr.) variations of lead geochemical signature in a macrotidal highly polluted estuary; ; et al in Geochimica et Cosmochimica Acta (2007, August), 71(15, Suppl. S), 993-993 Detailed reference viewed: 3 (1 ULg)Genesis of intermediate to silicic igneous rocks at the end of the Sveconorwegian (grenvillian) orogenyVander Auwera, Jacqueline ; ; Bolle, Olivier in Geochimica et Cosmochimica Acta (2007, August), 71(15S), 1054 Detailed reference viewed: 9 (4 ULg)Mineralogy and Nd and Pb isotope signatures of clay-size fraction of northern North Atlantic sediments during the Holocene and Late Glacial: Implications for the inception of modern deep circulation patternFagel, Nathalie ; ; et alin Geochimica et Cosmochimica Acta (2007), 71(15), 265-265 Detailed reference viewed: 1 (1 ULg)Spatial and temporal (30 yr.) variations of lead geochemical signature in a macrotidal highly polluted estuary; ; et al in Geochimica et Cosmochimica Acta (2007), 71(15), 993-993 Detailed reference viewed: 1 (0 ULg)Tracking groundwater contribution to rivers by combining hydrogen isotopes and cation concentrations; ; et al in Geochimica et Cosmochimica Acta (2007), 71(15), 134-134 Detailed reference viewed: 4 (1 ULg)The Sept Iles mafic layered intrusion; an example of ferrobasaltic differentiationNamur, Olivier ; Charlier, Bernard ; et alin Geochimica et Cosmochimica Acta (2007), 71(15S), 705 Detailed reference viewed: 38 (7 ULg)Early saturation of ilmenite and plagioclase buoyancy in Fe-Ti deposits associated with Proterozoic anorthositesCharlier, Bernard ; Vander Auwera, Jacqueline in Geochimica et Cosmochimica Acta (2007), 71(15S), 161 Detailed reference viewed: 19 (1 ULg)Deciphering the record of early life in Precambrian oceans using combined microscopy and microchemistry of organic-walled microfossils.Javaux, Emmanuelle ; in Geochimica et Cosmochimica Acta (2007), 71(15), 442 Detailed reference viewed: 9 (1 ULg)Modelling continental weathering: from the lab to the field; ; François, Louis et alin Geochimica et Cosmochimica Acta (2007), 71(15), 333-333 Detailed reference viewed: 3 (0 ULg)Modelling weathering processes at the catchment scale: The WITCH numerical model; François, Louis ; et alin Geochimica et Cosmochimica Acta (2006), 70(5), 1128-1147 A numerical model of chemical weathering in soil horizons and underlying bedrock (WITCH) has been coupled to a numerical model of water and carbon cycles in forest ecosystems (ASPECTS) to simulate the ... [more ▼] A numerical model of chemical weathering in soil horizons and underlying bedrock (WITCH) has been coupled to a numerical model of water and carbon cycles in forest ecosystems (ASPECTS) to simulate the concentration of major species within the soil horizons and the stream of the Strengbach granitic watershed, located in the Vosges Mountains (France). For the first time, simulations of solute concentrations in soil layers and in the catchment river have been performed on a seasonal basis. The model is able to reproduce the concentrations of most major species within the soil horizons, as well as catching the first-order seasonal fluctuations of aqueous calcium, magnesium and silica concentrations. However, the WITCH model underestimates concentrations of Mg2+ and silica at the spring of the catchment stream, and significantly underestimates Ca2+ concentration. The deficit in calculated calcium can be compensated for by dissolution of trace apatite disseminated in the bedrock. However, the resulting increased Ca2+ release yields important smectite precipitation in the deepest model layer (in contact with the bedrock) and subsequent removal of large amount of silica and magnesium from solution. In contrast, the model accurately accounts for the concentrations of major species (Ca, Mg and silica) measured in the catchment stream when precipitation of clay minerals is not allowed. The model underestimation of Mg2+ and H4SiO4 concentrations when precipitation of well crystallized smectites is allowed strongly suggests that precipitation of well crystallized clay minerals is overestimated and that more soluble poorly crystallized and amorphous materials may be forming. In agreement with observations on other watersheds draining granitic rocks, this study indicates that highly soluble trace calcic phases control the aqueous calcium budget in the Strengbach watershed. (c) 2005 Elsevier Inc. All rights reserved. [less ▲] Detailed reference viewed: 23 (0 ULg)Evolution of paleoclimatic conditions and vegetation change in Himalaya from compound specific hydrogen and carbon analyses; ; et al in Geochimica et Cosmochimica Acta (2006), 70(18), 468-468 Supplied by the Ganga–Brahmaputra fluvial system, the Bengal Fan provides an integrated record of the Himalayan basin history through time. The active channel-levee system of the middle fan documents the ... [more ▼] Supplied by the Ganga–Brahmaputra fluvial system, the Bengal Fan provides an integrated record of the Himalayan basin history through time. The active channel-levee system of the middle fan documents the last glacial/interglacial cycle. Organic geochemistry studies have shown that the organic matter contained in the Bengal Fan sediments is mainly of terrestrial origin. We analysed terrestrial n-alkanes (C27–C33) from Bengal Fan sediments and modern Ganga–Brahmaputra sediments. Comparison of compound specific hydrogen and carbon isotopic ratios in these samples allow us to follow the evolution of paleoenvironmental conditions since the Last Glacial Maximum. Carbon molecular isotopic data on the odd-HMW n-alkanes show a shift of 4&, corresponding to an evolution in the Himalayan system from a C4-dominated vegetation at LGM to a C3- dominated vegetation during the Holocene. It is now well known that C4 plants are more adapted than C3 plants to low atmospheric CO2 concentrations and to relatively hot and dry climate. In the same time, molecular D/H isotopic ratios measured on the same samples show an increase of the deuterium content of about 20& during the Holocene, which is consistent with lower temperature at the end of the LGM in the Himalaya. As low temperature should favored C3 plants, the predominance of a C4 vegetation have to be linked with dryer conditions at the end of the LGM. Afterwards, the increase of the C3/C4 ratio in the Himalayan system is related to a concomitant increase of humidity and pCO2 during the Holocene. [less ▲] Detailed reference viewed: 9 (0 ULg)Similar sources for the Apuseni Mts and Banat (Romania) Late Cretaceous Banatitic magmatismVander Auwera, Jacqueline ; ; Marincea, Stefan et alin Geochimica et Cosmochimica Acta (2004, June), 68(11, Suppl. S), 684 Detailed reference viewed: 9 (0 ULg)REE in bulk cumulates and the trapped liquid shift in the Bjerkreim-Sokndal layered intrusion (Norway)Charlier, Bernard ; Vander Auwera, Jacqueline ; Duchesne, Jean-Clair in Geochimica et Cosmochimica Acta (2004, June), 68(11, Suppl. S), 632 Detailed reference viewed: 23 (8 ULg)Major element geochemistry of cumulates from the Bjerkreim-Sokndal layered intrusion (Norway)Duchesne, Jean-Clair ; Charlier, Bernard in Geochimica et Cosmochimica Acta (2004, June), 68(11, Suppl. S), 647 Detailed reference viewed: 7 (0 ULg)Geochemical and Pb isotopic investigations in peat bogs from Southern Chile: Identification of particles supplies and possible paleoclimate recordDe Vleeschouwer, François ; ; et alin Geochimica et Cosmochimica Acta (2004), 68(11), 478-478 Detailed reference viewed: 9 (4 ULg)Geochemical and Pb isotopic investigations in peat bogs from Southern Chile: Identification of particles supplies and possible paleoclimate record; ; et al in Geochimica et Cosmochimica Acta (2004), 68(11), 478-478 Detailed reference viewed: 15 (4 ULg)Holocene record of atmospheric flux by geochemical and Pb isostopes signatures in a Belgian Hautes Fagnes peat bog: Preliminary results; ; et al in Geochimica et Cosmochimica Acta (2004), 68(11), 485-485 Detailed reference viewed: 8 (3 ULg)
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