Literatura científica selecionada sobre o tema "Géochimie des isotopes stables"
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Artigos de revistas sobre o assunto "Géochimie des isotopes stables"
Farid, Intissar, Kamel Zouari e Abderrahmen Kallali. "Origine de la salinité des eaux du bassin Chougafiya (Tunisie)". Revue des sciences de l’eau 25, n.º 3 (28 de novembro de 2012): 255–74. http://dx.doi.org/10.7202/1013106ar.
Texto completo da fonteGuillet, C., M. Debouit, M. Batisse, S. Walrand e Y. Boirie. "Isotopes stables et métabolisme : principe et applications". Médecine des Maladies Métaboliques 2, n.º 4 (setembro de 2008): 395–99. http://dx.doi.org/10.1016/s1957-2557(08)74041-0.
Texto completo da fonteBigot, Laurent. "La technologie de l’enrichissement de l’uranium au service de la production d’isotopes stables". Revue Générale Nucléaire, n.º 6 (novembro de 2020): 36–37. http://dx.doi.org/10.1051/rgn/20206036.
Texto completo da fonteBocherens, Hervé. "Isotopes stables et reconstitution du régime alimentaire des hominidés fossiles: une revue". Bulletins et Mémoires de la Société d'anthropologie de Paris 11, n.º 3 (1999): 261–87. http://dx.doi.org/10.3406/bmsap.1999.2552.
Texto completo da fonteTamponnet, C. "Behaviour of Lead-210 in continental environment: Comparison with stables isotopes of lead". Radioprotection 44, n.º 5 (2009): 285–89. http://dx.doi.org/10.1051/radiopro/20095055.
Texto completo da fonteCouchoud, Isabelle. "Les isotopes stables de l’oxygène et du carbone dans les spéléothèmes : des archives paléoenvironnementales". Quaternaire, n.º 19/4 (1 de dezembro de 2008): 275–91. http://dx.doi.org/10.4000/quaternaire.4532.
Texto completo da fonteGunepin, M., F. Derache, Y. Schuliar e X. Holy. "Intérêt de l'analyse des isotopes stables en identification médico-légale: Exemple du carbone 13". Canadian Society of Forensic Science Journal 46, n.º 4 (janeiro de 2013): 197–208. http://dx.doi.org/10.1080/00085030.2013.10799548.
Texto completo da fonteDrucker, Dorothée G., Hervé Bocherens e Stéphane Péan. "Isotopes stables (13C, 15N) du collagène des mammouths de Mezhyrich (Epigravettien, Ukraine) : implications paléoécologiques". L'Anthropologie 118, n.º 5 (novembro de 2014): 504–17. http://dx.doi.org/10.1016/j.anthro.2014.04.001.
Texto completo da fonteWinckel, Anne, Christelle Marlin, Laurent Dever, Jean-Luc Morel, Karim Morabiti, Mohamed Ben Makhlouf e Ahmed Chalouan. "Apport des isotopes stables dans l'estimation des altitudes de recharge de sources thermales du Maroc". Comptes Rendus Geoscience 334, n.º 7 (janeiro de 2002): 469–74. http://dx.doi.org/10.1016/s1631-0713(02)01764-9.
Texto completo da fonteFontugne, Michel, Christine Hatté, Hélène Valladas, Nadine Tisnérat-Laborde, Antoine Zazzo, Christine Oberlin, Emmanuelle Delque-Kolic, Christophe Moreau e Bernard Berthier. "De l’utilisation des isotopes stables du carbone dans la datation par la méthode du radiocarbone". L'Anthropologie 118, n.º 2 (abril de 2014): 194–200. http://dx.doi.org/10.1016/j.anthro.2014.03.004.
Texto completo da fonteTeses / dissertações sobre o assunto "Géochimie des isotopes stables"
Fleurent, Léonora. "Mécanismes d’enregistrement géochimique liés à des processus cinétiques au moment de la précipitation des travertins". Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS204/document.
Texto completo da fonteThe response of continental groundwater systems to recent climate fluctuations can be reconstructed via the continuous measurement of groundwater level, spring flow and climatic chronicles. When any data exist, recent reconstructions of groundwater dynamics may be reached through various recorders of environmental and hydrological conditions such as travertine. Although the relationship between geochemical records in travertine and environmental parameters seems to be accepted, the details of processes and their respective weight in the paleo-information are not clearly established.Rate of CO2 degassing in CO2-rich spring likely influences calcite precipitation rate and the related δ18O and δ13C composition. Isotopic equilibrium is rarely maintained during travertine deposition and the degassing rate is the main controlling factor of the disequilibrium. Due to the lack of knowledge, fractionation processes, either kinetic or equilibrium, occurring between CO2-rich water, gas and travertine required specific pH and temperature-controlled laboratory tests. These tests were conducted on synthetic water at different pH to focus only on the degassing processes. Other tests were conducted on trace elements partitioning during calcite precipitation, to identify the origin of isotopic signature variability, and to constraint the way of recording past conditions.All these tests confirmed that during a degassing leading to travertine precipitation, the speciation of dissolved inorganic carbon species is a major parameter to be tackled since a linear relationship between εDIC-CO2(g) and pH is observed. Indeed, we highlighted that for a high degassing rate, the isotopic equilibrium is not reached because the reaction greater involves light isotopes than heavy ones. There is thus different reaction rate between the species of dissolved inorganic carbon, the reactions occurring faster in the water than the one between water and gas, the latter being controlled by diffusion
Guzman, Guerra Nury. "Validation d'une approche scléroclimatique sur la côte du Chili et du Pérou par l'analyse microstructurale et biogéochimique des coquilles du gastéropode Concholepas concholepas [Bruguière, 1789]". Paris 11, 2004. http://www.theses.fr/2004PA112077.
Texto completo da fonteThe structure and composition of carbonate tests built by marine organisms may reflect environmental variations. The microstructural and geochemical study of Concholepas concholepas shells (gastropod living on the coasts of Chile and Peru) was undertaken with the aim to document the reconstruction of paleoceanographic and paleoenvironmental conditions during the Holocene. This requires, primarily, the calibration of a geochemical marker ("proxy") with a given physicochemical parameter of the environment. The understanding of the growth modalities of C. Concholepas and the establishment of the basis of a sclerochronology for this species were based upon marking experiments with fluorochroms. These experiments of weekly markings further provided an adequate chronological framework for the geochemical study of shells. Measurements by laser ablation ICP-MS, electronic microprobe and SIMS thus allowed us to obtain elementary and isotopic profiles in the calcite of C concholepas shells at a very high resolution (few hours) time-scale. The geochemical measurements within the calcite of C. Concholepas indicate that Mg abundance and delta 18O contents grossly covary with the recorded temperature. However, these relations are not completely linear. Factors probably related to metabolic activity of the organisms interfere at several levels in the incorporation of minor and trace elements and in the isotopic fractionation phenomena during the biomineralisation processes
Belmecheri, Soumaya. "Reconstitution du dernier cycle climatique dans le sud des Balkans : géochimie des ostracodes lacustres (Ohrid)". Paris 11, 2008. http://www.theses.fr/2008PA112302.
Texto completo da fonteBenetti, Marion. "Les isotopes stables de l'eau en Atlantique Nord". Electronic Thesis or Diss., Paris 6, 2015. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2015PA066022.pdf.
Texto completo da fonteThis thesis focuses on two regions of the North Atlantic: the subtropical gyre and the subpolar gyre. This large coverage allows an investigation of the water cycle in different hydrological regimes, where various processes take place such as sea ice seasonal cycle, rivers runoff, continental ice melt and advection of air and water masses. In the subtropical region, the variability of the isotopic composition of the water vapor is studied to understand the role of evaporation and mixing with free troposphere in humidity and isotopic compositions at the ocean surface. In particular, new data collected during summer 2012 (STRASSE cruise) gave the opportunity to explore kinetic fractionation processes during oceanic evaporation and air renewal in the atmospheric boundary layer. In the subpolar region, the surface circulation is cyclonic and transfers cold and fresh water from the arctic region to the interior of the subpolar gyre. For this thesis, data were collected between 2010 and 2014 from oceanographic cruises and commercial vessels to study the gyre interior and the main coastal currents carrying water from the arctic to lower latitudes. The study is mainly focused on the Labrador Current. There, isotopic measurements are used to identify the freshwater sources and to consider the following questions: How is the salinity of fresh currents affected by the sea ice formation and melting? How is the contribution of meteoric waters changing in a context of an acceleration of the melting of continental glaciers?
Thomazo, Christophe. "Métabolismes à 2, 7 Ga dans leurs environnements". Paris 7, 2008. http://www.theses.fr/2008PA077182.
Texto completo da fonteSecular variations of δ13Corg, δ34S, Δ33S et du δ15N through geological times show large shifts around 2,7 Ga. These shifts were mostly reported from independent sediment sections. In this study, we measured isotopic ratios and elemental contents of C, S and N in the same samples from a pristine drill core retrieved from the Tumbiana Formation (2,73 Ga). Organic δ 13C values vary from -43 to -34%o, reflecting variable contribution of 13C-depleted methanotrophic biomass. Sulfide δ 34S show small variation from -5,8 to 2,7%o, suggesting that the 2,73 Ga environment of the Tumbiana Formation was sulfate-limited. Mass-Independent-Fractionation of S isotopes show anomalies ranging between -0. 24 and 1. 64%o, indicating anoxic environmental conditions. A positive correlation between the 12C-enrichment of organic matter and increasing MIF-S was observed, maybe due to the decrease in atmospheric methane concentration as a result of biotic methane assimilation. Sedimentary N show strong 15N enrichment with 815N values ranging between 8,6 and 50,4%o. I propose here a process of the oxidation of ammonium to nitrite to explain these high 515N values. This thesis reports, for the first time, integrated C, N and S isotopes measurements in the same sedimentary formation at 2,73 Ga. It shows that δ 15N and δ 13C strong excursions are synchronous with the onset of Δ 33S increase while δ 34S variations remain minor. These integrated isotopes approach facilitate to identify different types of metabolisms with respect to environmental conditions. Our results suggest that a stepwise increase in the oceanic oxidation degree could exist 400 Ma before the Great Oxidation Event
Rouxel, Olivier. "Géochimie isotopique des métaux (Fe, Cu, Sb) et des metalloides (S, Se) dans la croûte océanique". Vandoeuvre-les-Nancy, INPL, 2002. http://www.theses.fr/2002INPLA43N.
Texto completo da fonteHamelin, Cédric. "Géochimie isotopique du lithium dans les basaltes - Géochimie des MORBs du Pacifique Sud". Phd thesis, Université de Bretagne occidentale - Brest, 2008. http://tel.archives-ouvertes.fr/tel-00344949.
Texto completo da fonteBenetti, Marion. "Les isotopes stables de l'eau en Atlantique Nord". Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066022/document.
Texto completo da fonteThis thesis focuses on two regions of the North Atlantic: the subtropical gyre and the subpolar gyre. This large coverage allows an investigation of the water cycle in different hydrological regimes, where various processes take place such as sea ice seasonal cycle, rivers runoff, continental ice melt and advection of air and water masses. In the subtropical region, the variability of the isotopic composition of the water vapor is studied to understand the role of evaporation and mixing with free troposphere in humidity and isotopic compositions at the ocean surface. In particular, new data collected during summer 2012 (STRASSE cruise) gave the opportunity to explore kinetic fractionation processes during oceanic evaporation and air renewal in the atmospheric boundary layer. In the subpolar region, the surface circulation is cyclonic and transfers cold and fresh water from the arctic region to the interior of the subpolar gyre. For this thesis, data were collected between 2010 and 2014 from oceanographic cruises and commercial vessels to study the gyre interior and the main coastal currents carrying water from the arctic to lower latitudes. The study is mainly focused on the Labrador Current. There, isotopic measurements are used to identify the freshwater sources and to consider the following questions: How is the salinity of fresh currents affected by the sea ice formation and melting? How is the contribution of meteoric waters changing in a context of an acceleration of the melting of continental glaciers?
Simon, Laurent. "Quelques exemples de modélisations géochimiques des interactions entre les enveloppes terrestres". Lyon, École normale supérieure (sciences), 2003. http://www.theses.fr/2003ENSL0257.
Texto completo da fonteGuéguen, Bleuenn. "Apport de la géochimie isotopique du Nickel à l'étude des dépôts métallifères océaniques". Thesis, Brest, 2013. http://www.theses.fr/2013BRES0089/document.
Texto completo da fonteScientific explorations implemented for around forty years allow to identifying the diversity and the complexity of geological and geochemical processes conducting to metals concentration on the deep seafloor. Fe- and Mn-rich metalliferous deposits such as hydrogenetic and hydrothermal ferromanganese (Fe-Mn) crusts and polymetallic nodules, present various enrichment in elements of economic interests like Ni, Cu, Co, Te, Pt and Rare Earth Elements. Although the mineralogy and geochemistry of these deposits have been largely studied in the literature, metal sources remain poorly determined. Accordingly, understanding the geochemistry of these deposits implies to know which processes are involved in their formation but also to have a better knowledge of the sources (e.g. the continental and hydrothermal fluxes) and their importance in the global oceanic metal biogeochemical cycles. In order to fill this gap, our approach consisted in using metal stable isotope compositions as biogeochemical tracers. This project is organized around two hypotheses, (1) development and utilization of a new geochemical tool, namely Ni isotopes, for tracing metal enrichment sources and processes in oceanic metalliferous deposits; (2) combination of several isotope systematics such as Fe, Pb, Cu, Zn (and Ni) in Fe-Mn crusts as proxies of the deep seawater isotope composition. Upon developing an analytical method for measuring Ni isotopes by MC-ICP-MS and estimating the Ni isotopes variability in natural systems through the characterization of terrestrial reservoirs, we experimentally evaluated Ni isotope fractionation during adsorption on Fe- and Mn-oxyhydroxides since similar processes may potentially occur in natural Fe-Mn deposits. Results indicate that after Ni adsorption, the solid phase is enriched in light Ni isotopes relatively to the solution with fractionation factors (Δ60/58Nimin/sol) varying from -1 ‰ for birnessite, -0.9 ‰ for goethite and -0.4 ‰ for ferrihydrite. These results, and other recent studies, strengthen our hypothesis according to which Ni isotopes variability in Fe- and Mn-rich metalliferous deposits can be explained by enrichment and formation processes during metal incorporation in Fe and Mn mineral phases rather than variations in the isotopic composition of the sources. Thus, hydrogenetic Fe-Mn crusts formed slowly from seawater dissolved metals do not show significant Ni isotope fractionation, whereas hydrothermal deposits formed by relatively rapid processes as a result of hydrothermal inputs exhibit important Ni isotope fractionation
Livros sobre o assunto "Géochimie des isotopes stables"
Schimel, David Steven. Theory and application of tracers. San Diego: Academic Press, 1993.
Encontre o texto completo da fonteRadiogenic isotope geology. Cambridge: Cambridge University Press, 1995.
Encontre o texto completo da fonteRadiogenic isotope geology. 2a ed. Cambridge, UK: Cambridge University Press, 2005.
Encontre o texto completo da fonteRadiogenic isotope geology. Cambridge: Cambridge University Press, 1997.
Encontre o texto completo da fonteHandbook of Stable Isotope Analytical Techniques. Elsevier Science, 2006.
Encontre o texto completo da fonteGroot, P. A. de. Handbook of Stable Isotope Analytical Techniques. Elsevier Science, 2004.
Encontre o texto completo da fonteRadiogenic isotope geochemistry a guide for industry professionals. Cambridge University Press, 2016.
Encontre o texto completo da fonteCarter, James F., e Lesley A. Chesson. Food Forensics: Stable Isotopes As a Guide to Authenticity and Origin. Taylor & Francis Group, 2017.
Encontre o texto completo da fonteFood Forensics: Stable Isotopes As a Guide to Authenticity and Origin. Taylor & Francis Group, 2017.
Encontre o texto completo da fonteDickin, Alan P. Radiogenic Isotope Geology. Cambridge University Press, 2012.
Encontre o texto completo da fonte