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Artykuły w czasopismach na temat "Géochimie de l'environnement – Nouvelle-Calédonie"
Andreoli, Rémi, Benoît Ducarouge, Jonathan Maura, Audrey Leopold, Pierre-Nicolas Mougel, Arnaud Durand, Cyril Marchand i in. "L'imagerie spatiale à très haute résolution au coeur du dispositif de Geospatial Cloud Computing QëhnelöTM : application aux données Pléiades en Nouvelle-Calédonie." Revue Française de Photogrammétrie et de Télédétection, nr 209 (11.01.2015): 47–57. http://dx.doi.org/10.52638/rfpt.2015.185.
Pełny tekst źródłaKowasch, Matthias. "Le développement de l'industrie du nickel et la transformation de la valeur environnementale en NouvelleCalédonie". Journal of Political Ecology 19, nr 1 (1.12.2012): 202. http://dx.doi.org/10.2458/v19i1.21727.
Pełny tekst źródłaBriseul, Jean-Paul. "Arrêté d'autorisation d'exploitation d'une usine de traitement de minerai de nickel et de cobalt. / Implantation du site dans un lagon. / Recours en annulation contre l'arrêté. / Application du droit calédonien relatif aux installations classées pour la protection de l'environnement / Enquête publique : motivation insuffisante de l'avis favorable du commissaire-enquêteur. / Etude d'impact : rejets de résidus d'effluents issus du processus de lavage acide sous pression dans le milieu marin. / Analyse de l'écotoxicité réalisée à partir d'un échantillon d'effluents sur des espèces dont le choix n'est pas représentatif et au moyen de tests dont l'approche est contestable. / Insuffisance de l'étude d'écotoxicité. / Vice substantiel. / Annulation de l'arrêté d'autorisation. Tribunal administratif de Nouvelle-Calédonie, 14 juin 2006, Comité Rheebu Nuu et M. Raphaël X., n° 0536. Avec conclusions". Revue Juridique de l'Environnement 32, nr 2 (2007): 225–37. http://dx.doi.org/10.3406/rjenv.2007.4639.
Pełny tekst źródła"8. Textes de droit de l'environnement applicables en Nouvelle-Calédonie". Revue Juridique de l'Environnement 18, nr 1 (1993): 128–29. http://dx.doi.org/10.3406/rjenv.1993.2916.
Pełny tekst źródłaRozprawy doktorskie na temat "Géochimie de l'environnement – Nouvelle-Calédonie"
Klein, Perrine. "Dynamique du nickel, chrome, cuivre et zinc : du processus de compostage à l'épandage des matières fertilisantes d'origine résiduaire (MAFOR) dans des agrosystèmes de Nouvelle-Calédonie". Electronic Thesis or Diss., Nouvelle Calédonie, 2023. http://www.theses.fr/2023NCAL0004.
Pełny tekst źródłaRecycling waste-derived fertilizers (mafor) by returning them to the soil is a key practice for preserving soil organicmatter stocks while ensuring agricultural production. In New Caledonia, soils and mafor can contain high concentrationsof metallic elements (ME), notably nickel (Ni) and chromium (Cr). Copper (Cu) and zinc (Zn) are classically present inmafor. The aim of this thesis was to clarify the origin and behavior of Ni, Cr, Cu and Zn, from the production of compostfrom green waste and sewage sludge, to its use in agriculture. First, the results obtained on the compost showed thegeogenic nature of Cr and Ni, as opposed to the anthropogenic origin of Cu and Zn. The composting process doubled therapidly mobilizable Cr reservoir. Secondly, monitoring the application of compost on two contrasting soils showed thatmobilizable reservoirs depend on ME considered and soil type. Finally, the fate of available and mobilizable MEs wasstudied in an orchard with different fertilization and soil management practices. Agro-ecological practices appeared toimpact the transfer of MEs to orange trees, with facilitated uptake of (1) Ni, Cu and Zn when leguminous were cocultivated,and (2) Cr when straw was used. In the short term, the addition of compost has not resulted in any transfer of ME to the fruit. However, there is still a need for further research into the fate of MEs, with a view to establishing a local regulatory framework for the recovery of mafor
Traoré, Daouda. "Serpentinisation hydrothermale et altération latéritique des roches ultrabasiques en milieu tropical : Evolution géochimique et minéralogique de la minéralisation en platine de la Rivière des Pirogues (Nouvelle-Calédonie)". Phd thesis, Nouvelle Calédonie, 2005. http://portail-documentaire.univ-nc.nc/files/public/bu/theses_unc/TheseDaoudaTraore2005.pdf.
Pełny tekst źródłaFandeur, Dik Stefano. "Géochimie et cristallochimie du chrome au cours de l'altération de roches ultrabasiques en Nouvelle-calédonie (Massif du Koniambo)". Paris 7, 2009. http://www.theses.fr/2009PA077035.
Pełny tekst źródłaIn New-Caledonia, 35 Ma of deep weathering of ultramafic rocks yield soils strongly enriched in metallic trace elements (Ni, Co, Cr, Mn). In these soils, these large amounts of metallic trace elements constitute a significant risk for the environmental quality of this peculiar environment. Among these metallic trace elements, chromium is the most problematic because it is the most abundant (up to 3,8 wt% of Cr₂O₃), but also that showing the largest toxicity potential, depending on its redox state. After studying the redistribution of major and trace elements upon the formation of a 64 meters depth regolith in the Koniambo outcrop, a detailed study of the crystal-chemistry of chromium allowed to better understand thé behavior of this element along the weathering sequence. Initially as Cr(III), Cr is partially oxidized to Cr(VI) after redox reactions with Mn-oxyhydroxydes which accumulate at the boundary between the saprolitic and lateritic levels of the sequence. These Mn-oxyhydroxydes are also suspected to significantly increase the solubility of chromite, a mineral species usually considered as almost insoluble Regarding the very large solubility of Cr(VI), such an oxidation of Cr(III) should significantly increase the leaching of chromium along the sequence. However, mass balance with the Brimhall method indicate a quite restricted mobility for chromium, although slightly larger in the Mn-enriched levels. These observations are explained by the results of spatially-resolved analyses which show that, once oxidized by the Mn-oxyhydroxydes, Cr(VI) is re-adsorbed by the Fe-oxyhydroxydes (mainly goethite), abundant in these lateritic environments, underlying the importance of Fe-oxyhydroxydes to mitigate this leaching
Hédouin, Laetitia. "Caractérisation d'espèces bioindicatrices pour la surveillance des activités minières et la gestion de l'environnement en milieu récifal et lagonaire : application au lagon de Nouvelle-Calédonie". La Rochelle, 2006. http://www.theses.fr/2006LAROS161.
Pełny tekst źródłaMining activities constitute the major economic resource of New Caledonia. This doctoral research was realized in order to develop a programme for biomonitoring mining contamination in the New Caledonia coastal waters using marine organisms as “bioindicators”: the brown alga Lobophora variegata, the oysters Malleus regula and Isognomon isognomon and the clam Gafrarium tumidum. In this context, the bioindicative value of these four organisms for Ag, As, Cd, Co, Cr, Mn, Ni and Zn has been investigated through both laboratory and field experiments. Laboratory investigations of the bioaccumulation behaviour of the four organisms using radiotracer techniques demonstrated their high bioaccumulation and retention capacities for the contaminants tested. Moreover, the organisms respond to the most relevant criteria of a bioindicator species: the contaminant concentrations in organisms actually reflect those occurring in the environment. Field experiments showed that the analysis of contaminant concentrations in resident populations of clams, oysters and algae allowed discriminating sites according to their degree of contamination. In addition, transplantations of organisms between clean and contaminated sites indicated that the species displayed efficient bioaccumulation capacities for the contaminants in situ, and consequently, they can be used to monitor sites where the species were not naturally present. Overall, it is concluded that L. Variegata, G. Tumidum and I. Isognomon are efficient and reliable bioindicator species that may be used for active and passive biomonitoring of mining contamination in the lagoon of New Caledonia
Castellaro, Christine (1970. "Reconstitutions paléoclimatiques et paléoenvironnementales à l'Halocène et au Pléistocène terminale en Nouvelle-Calédonie et aux Seychelles (région indo-pacifique) : l'enregistrement par les coraux". Aix-Marseille 1, 1999. http://www.theses.fr/1999AIX11056.
Pełny tekst źródłaPascal, Frédéric. "Minéralogie, géochimie et dynamique sédimentaire des carbonates actuels et récents du bassin des Loyauté (Nouvelle-Calédonie, Pacifique sud-ouest)". Lyon 1, 1990. http://www.theses.fr/1990LYO10069.
Pełny tekst źródłaBréau, Ludovic. "Etude de la bioaccumulation des métaux dans quelques espèces marines tropicales : recherche de bioindicateurs de contamination et application à la surveillance de l'environnement côtier dans le lagon sud-ouest de la Nouvelle-Calédonie". La Rochelle, 2003. http://www.theses.fr/2003LAROS109.
Pełny tekst źródłaThe present work has two goals : i) identify few macrobenthic species as potential biomonitors of metal contamination of the coastal environment in New Caledonia ; ii) use jointly these species to assess bioavailable metal inputs in different areas of the SW lagoon. On the basis of biological inventories carried out in six different coastal sites, ten species (macroalgae, bivalves, echinoderms and octocorals) commonly found in these sites were selected. The study of concentration levels and geographical variability of Al, Co, Cr, Cu, Fe, Mn, Ni and Zn in soft tissues of these species showed that most of them appear to be suitable biomonitors, especially the alga Lobophora variegata and the bivalve Isognomon isognomon. Metal concentrations and spatial differences in these species revealed that two significant part of terrigenous metal inputs to the lagoon is bioavailable to these species
Quesnel, Benoît. "Altération supergène, circulation des fluides et déformation interne du massif de Koniambo, Nouvelle-Calédonie : implication sur les gisements nickélifères latéritiques". Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S103/document.
Pełny tekst źródłaThe New Caledonia nickel laterite ore deposit, developed at the top of the Peridotite Nappe, hosts about 20% of the nickel resources worldwide. In order to better understand the formation of this eposit, our study, focusing on the Koniambo Massif, is not restricted to the ore zone but concerned with the whole peridotite pile. Our approach combined: i) the analysis of the internal deformation of the massif, ii) the isotopic characterization of quartz and magnesite veins which are suspected to represent by-products of the laterization process, iii) the 3D modelling of the lateritenickel ore deposit, based on a dataset of ~6000 subsurface boreholes and the study of some outcrops located into the mineralized area. The spatial and temporal evolution of the deformation associated with serpentinization is described across the ~800 m-thick rock pile of the Koniambo Massif. The upper part of the massif is densely faulted and preserves the record of two early deformation events. The first one is associated with synantigorite faults and the second one with syn-polygonal serpentine faults. The ~200m-thick serpentine sole is composed of breccias and mylonites and records pervasive tangential shearing associated with polygonal serpentine and magnesite. Thus, the serpentine sole represents a major décollement at the base of the nappe. Between the sole and the upper part of the massif, anintermediate structural level is identified, characterized by the presence of plurimetric shear zones that probably merge with the sole.The 3D characterization of the nickel distribution in the saprolite level, at both deposit and outcrop scales, gives evidence for processes implying not only vertical (as commonly assumed) but also lateral nickel redistribution. This lateral transport ismechanical or associated with fluids and leads to significant local enrichments. The isotopic characterization of the quartz veins associated with garnieritic ore shows that they formed under low temperature hydrothermal conditions. The structural and isotopic (coupling “stable isotope” and “clumped isotope thermometry”) characterization of the magnesite veins located at the serpentine sole shows that they are syn-tectonic and derived from low temperature meteoric water. As a result, we propose that active tectonics has enhanced the infiltration of the meteoric waters involved in the laterization process down to the base of the nappe
Lelabousse, Clement. "Diagenèse et reconstruction de variables environnementales à partir de la géochimie du corail Porites sp. (Nouvelle-Calédonie, Pacifique Sud-Ouest )". Phd thesis, Paris, ENSAM, 2012. http://tel.archives-ouvertes.fr/tel-00787482.
Pełny tekst źródłaJacotot, Adrien. "Dynamique du carbone dans les mangroves de Nouvelle-Calédonie : Passé, présent, futur". Thesis, Nouvelle Calédonie, 2017. http://www.theses.fr/2017NCAL0004/document.
Pełny tekst źródłaMangroves are complex and unique ecosystems that develop on intertidal areas along (sub)tropical coastlines. Due to their position, they are considered as major ecosystems in the coastal carbon cycle. Thanks to their high primary productivity, coupled with a high carbon sequestrating capacity in both biomass and soils, mangroves have been called “Blue Carbon” ecosystems. However, future climate change, and particularly increases in atmospheric CO2 concentrations, temperatures and sea-level rise, may alter its functioning. Within this context, the objectives were to (i) understand how eustatic variations may have impacted soil carbon stocks by the past, in order to better predict the effects of future sea-level rise, (ii) characterize CO2 and CH4 emissions from the soil and also from the water column within the mangrove forest, and (iii) evaluate the impact of future increase in atmospheric CO2 concentrations and in sea-level may affect the physiology of young mangrove seedlings. Increases in atmospheric CO2 concentrations will modify either the seedlings productivity and photosynthetic activity, therefore facilitating their ability to colonize new accommodation spaces due to the rising sea-level. This increase in sea-level will also have a consequent impact on soil carbon stocks, as we showed for the past eustatic variations of the late Holocene, also implying a migration of mangroves stands. Eventually, CO2 and CH4 emissions to the atmosphere were non-neglectable, particularly the one emitted from the water column