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作者:... Emmanuel Ponzevera , Charlotte Skonieczny , Luc André
来源:[J].Earth and Planetary Science Letters(IF 4.349), 2019, Vol.505, pp.30-41
摘要:Abstract(#br)There is increasing evidence that abrupt vegetation shifts and large-scale erosive phases occurred in Central Africa during the third millennium before present. Debate exists as to whether these events were caused by climate change and/or intensifying human acti...
作者:... Damien Cardinal , Axel Hofmann , Luc André
来源:[J].Chemical Geology(IF 3.154), 2016, Vol.420, pp.139-147
摘要:Abstract(#br)The influence of continental weathering on oceanic seawater compositions in the Precambrian is poorly understood. Here we combine Si isotopes and Ge/Si ratios of a Mesoarchean paleosol (~ 2.95 Ga) and overlying shales as proxies for weathering processes and Si m...
作者:... Sylvain Bermell , Emmanuel Ponzevera , Luc André
来源:[J].Earth and Planetary Science Letters(IF 4.349), 2016, Vol.438, pp.25-36
摘要:Abstract(#br)The hafnium and neodymium radiogenic isotope systems behave differently during Earth surface processes, causing a wide dispersion of Hf and Nd isotopic compositions in sediments and other sedimentary rocks. The decoupling between Hf and Nd isotopes in sediments ...
作者:Luc André , Benedicta Ronchi ...
来源:[J].Scientific Reports(IF 2.927), 2015, Vol.5 (1)
摘要:Despite increasing recognition of the relevance of biological cycling for Si cycling in ecosystems and for Si export from soils to fluvial systems, effects of human cultivation on the Si cycle are still relatively understudied. Here we examined stable Si isotope (δ30...
作者:Luc André , Benedicta Ronchi ...
来源:[J].Scientific Reports(IF 2.927), 2015, Vol.5 (1), pp.310-329
摘要:Abstract(#br)Despite increasing recognition of the relevance of biological cycling for Si cycling in ecosystems and for Si export from soils to fluvial systems, effects of human cultivation on the Si cycle are still relatively understudied. Here we examined stable Si isotope...
作者:Luc André , Damien Cardinal ...
来源:[J].Earth and Planetary Science Letters(IF 4.349), 2006, Vol.245 (1), pp.162-173
摘要:Abstract(#br)We report MC-ICP-MS Si-isotopic measurements ( δ 29 Si recalculated as δ 30 Si) on micro-subsamples (at 500 μm scale) from several major rock types of the ∼3.8-Ga-old Isua Greenstone Belt (IGB, southern West Greenland) and surrounding Eoarchaean terrains. W...
作者:Nathalie Fagel , Luc André , Pierre Debrabant
来源:[J].Geochimica et Cosmochimica Acta(IF 3.884), 1997, Vol.61 (5), pp.989-1008
摘要:Abstract(#br)This paper reports a geochemical study of oceanic clays. Major and trace elements were analyzed on smectite-rich, clay size (<2 μm) samples, bulk sediments, and leachate residues from the Central Indian Basin. SrNd isotopes were also studied to investigate thei...
作者:... Stijn Dewaele , Luc André , Philippe Muchez
来源:[J].Geochimica et Cosmochimica Acta(IF 3.884), 2014, Vol.132, pp.349-374
摘要:Abstract(#br)This study presents a general model for the evaluation of Rayleigh fractional crystallisation as the principal differentiation mechanism in the formation of regionally zoned common and rare-element pegmatites. The magmatic evolution of these systems from a grani...
作者:... Denis Langlet , Yves-Marie Paulet , Luc André
来源:[J].Geochimica et Cosmochimica Acta(IF 3.884), 2013, Vol.121, pp.374-397
摘要:Abstract(#br)We estimate the magnesium stable isotopic composition (δ 26 Mg) of the major compartments involved in the biomineralisation process of euryhaline bivalve, the manila clam Ruditapes philippinarum . Our aim is to identify the fractionation processes associated wit...

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