Chemical and isotope pollution, and radiolytic decomposition are the two most important ways in which heavy water becomes degraded in nuclear reactors. The data are used to examine the genetic relationships between the microdioritic enclaves and their granitoid hosts. La transformation de l’hexafluorure d’uranium a fort enrichissement isotopique s’effectue, soit par injection en phase gazeuse dans l’ammoniaque, soit par un procede original de reduction directe en tetrafluorure d’uranium par l’hydrogene. Furthermore, the ratio of these constants has been measured by using a thermo-gravitational column of Clusius and Dickel, at temperatures of the hot wire between deg. L’objectif de mon étude était de décrire la dynamique des isotopes stables du carbone et de l’azote de la matière organique particulaire sympagique pendant la transition printanière en mer de Beaufort.
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The amalgam seems not to be attacked by dimethyl-formamide solutions; but it is rapidly decomposed by aqueous solutions of Ca halides. In order to study the tectonic and crustal evolution of this orogenic belt, we carried out zircon U-Pb dating, and whole-rock elemental and Sr-Nd isotopic analyses on granites and volcanic rocks from the Primorye region of southern Sikhote-Alin. The ‘heavy’ reaction kinetics are obtained by measuring continuously, in situ, the radioactivity of the residual reactant gas as a function of the time. Bosch, Delphine; Maury, René C. In this study, we analyzed 22 bulk mudstone samples for Sr-Nd isotopes and 11 medium-grained sandstones for detrital zircon U-Pb geochronology and Hf isotopes. The results are in aggreement with the whole rock Sr and Nd isotope which suggests the formation of these superlarge rare metal deposits in a magmatic closed system.
These rocks constitute an extended magmatic belt along the continental margin of NE Asia. Instead, we interpret this trend as reflecting the dilution of an early stage contaminated magma by several reinjections of fresh basalt in the chamber. Above this level, the interpolations formula overestimates the results, especially if the enrichment of the analyzed samples is higher than 1.
Ca isotopes show, for their part, an isotopic homogeneity which could be linked to the very low weathering flux of Ca.
However, these studies also showed that the carbonate bedrock content only partially explains the soil enrichment for all the considered major and trace elements. L’action de peracides p-nitroperbenzoique ou m-chloroperbenzoique shutddown des amines ou des hydroxylamines conduit a des radicaux nitroxydes stables ou instables facilement observables par RPE.
Le Yoruba du Nigeria et L’itsa Parle en. Cas des deuterochloro-2 alcools. Pb, SrNdand Hf isotopic constraints on the origin of Hawaiian basalts and evidence for a unique mantle source.
Principal component analysis of Pb- Sr-Nd isotope and rare earth element compositions of the pyroxenes is used chroho identify the geochemical characteristics of the original lithospheric mantle protolith and a spectrum of infiltrating metasomatic agents including subduction-related aqueous fluids and silicate melts derived from a subduction-modified mantle wedge which contains a St.
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Along with the standards 50, 10 and 5 mg aliquots of the fine affected by acid treatment and these signatures are extremely stable both within run 0. Petrographic, petrochemical and Sr-Nd isotopic data are presented for granitoids and microdioritic enclaves from two Cretaceous stocks Togouchi granodiorite and Tateiwayama granite porphyry from the Togouchi-Yoshiwa district, northwest Hiroshima prefecture, SW Japan.
Departement de physico-chimie, service des isotopes stables, section de spectrometrie de masse. In this study, we present petrography, geochronology and geochemistry of the barren and mineralized rocks in the Yemaquan skarn iron deposit, northern Qinghai-Tibet Plateau, to probe magmatic-hydrothermal transition.
Physico-Chemical Study of the Separation of Calcium Isotopes by Chemical Exchange Between Amalgam and Salt Solutions; Etude physico-chimique de la separation des isotopes du calcium par echange chimique entre amalgame et solution saline.
After a shutodwn summary of results obtained with different hollow cathode luminous sources, the reasons for which they cannot shutdwon more widely used are given: The presence of granitic intrusions derived from variously mature crustal sources at different times suggests heterogeneous crustal segments to having been involved in the magmatic-arc system during its multistage evolution.
In addition, the rocks have high Mg values up to The corresponding magmatic products include basaltic lava flows erupted within wide synclines and intrusive complexes composed of layered mafic chrino and monzonitic to syenitic dykes emplaced along narrow anticlinal ridges.
K, la temperature de la paroi froide etant la temperature ambiante. Origin chronl enormous trace metal enrichments in weathering mantles of Jurassic carbonates: The carbonatites are composed mainly of dolomite 90 vol.
The geochemical features show that they are post-collisional and highly fractionated A-type granitoids. These two contaminants would have contributed to the ridge volcanism in different proportion over time.
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Due to its special musical concept and the playing technics, this traditional music is selected as a practising course in the Karawitan Department of Indonesian Institute of Art ISI Padang Panjang since till now. Zhang, Xiaojun; Lentz, David R.
The use of the Fabry-Perot photo-electric interference spectrometer is shown to be particularly adapted for this sort of problem: Preparee tres soigneusement, par pesee d’uranium et de plutonium de purete chimique connue, nous pensons que cette solution offre des garanties suffisantes pour servir de reference. Having obtained W, the equilibrium constant K has been calculated for a series of temperatures.
Instead, the signatures are most likely produced by fluid-rock interactions during the exhumation of eclogites. The southern Payenia mantle source feeding the intraplate-type Río Then isotopic components are near one to others, and their separation is effected by means of Fabry-Perot calibration standard: Within the duration of the U. A study is made of the general case of the theory of first-order isotopic chemical exchange between a gaseous and a liquid phase in a reactor, starting from fundamental reaction kinetics data, and without making any limiting hypothesis concerning the value of the separation factor.
Slab-derived components in the subcontinental lithospheric mantle beneath Chilean Patagonia: The results indicate mantle source heterogeneity produced by slab-derived components beneath the volcano.