2 edition of development of a multi-collector ion microprobe for the study of oxygen isoltopes in nature. found in the catalog.
development of a multi-collector ion microprobe for the study of oxygen isoltopes in nature.
Manchester thesis (Ph.D.), Department of Geology.
|Contributions||University of Manchester. Department of Geology.|
|The Physical Object|
|Number of Pages||283|
Oxygen isotope compositions were obtained using a Cameca ion microprobe at the University of Edinburgh, and are reported relative to the internal standard zircon ( ± ‰). Oxygen isotope determinations were either made prior to laser ablation Hf isotope analysis, or adjacent to the laser ablation by: A mass dependent fractionation of oxygen isotopes results in an isotopic value that closely follows the relation δ 17 O =δ 18 O. Equilibrium chemical processes such as isotope exchange, diffusion, evaporation and condensation are sensitive to isotopic mass, and different isotopes may be incorporated into the molecules at different rates.
An ion microprobe is a mass spectrometer that uses the principle of secondary ion mass spectrometry (SIMS) and enables in situ elemental and isotopic analysis of a solid sample. Operation Principle Ions accelerated at ~10 kV under high vacuum (i.e., primary ions) are focused onto sample surface. OXYGEN ISOTOPE MICROANALYSIS BY SECONDARY ION MASS SPECTROMETRY SUGGESTS Oxygen isotopes preserve important information about the temperature at which minerals form and the nature of the ﬂuids from which they study and that modeled in the Kuhn et al. () study. Williston Basin is outlined in red.
In this study, the oxygen isotope (δ18O) composition of pink to red gem-quality rubies from Paranesti, Greece was investigated using in-situ secondary ionization mass spectrometry (SIMS) and laser-fluorination techniques. Paranesti rubies have a narrow range of δ18O values between ~0 and +1‰ and represent one of only a few cases worldwide where δ18O signatures can be used to Cited by: 3. Determinations of oxygen and carbon isotopes of carbonate cements were performed on seven samples using a CAMECA IMS ion microprobe at the CRPG-CNRS, Nancy, France.
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For oxygen isotope analyses, a primary Cs + ion beam (oxygen is an electronegative element) with energy from 10 to 20 keV is focused on a polished sample producing secondary negative ions.
Generally, slow secondary ions (few to ∼30 eV) are used, but use of high-energy secondary ions is also possible.
IN SITU OXYGEN ISOTOPE GEOCHEMISTRY BY ION MICROPROBE 21 FIG. Results from 48 hours of analysis of δ18O in quartz from 12 sample mounts by IMS at are from Rusk et al. The spots analyzed include from the quartz standard, UWQ-1 (solid dots).
Ion microprobe survey of the grain-scale oxygen isotope geochemistry of minerals in metamorphic rocks John M. Ferrya,⇑, Kouki Kitajimab, Ariel Stricklandb, John W.
Valleyb aDepartment of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MDUSA b WiscSIMS, Department of Geoscience, University of Wisconsin, Madison, WIUSA.
The ion microprobe is a SIMS instrument with a focused primary ion beam, which permits in situ microanalysis of minerals in samples prepared as standard polished sections.
Nearly all elements from H to U can be detected and many can be analysed quantitatively down to part-per-million levels, or by: In this study, 27 garnets were used to evaluate matrix effects in oxygen isotope analysis by ion microprobe ().All of these standards were evaluated for oxygen isotopic homogeneity by ion microprobe, and for cation homogeneity by electron microprobe (Supplementary Table A).Oxygen isotope ratios were determined by laser fluorination for all new standards, and in some cases existing Cited by: Accurate ion microprobe analysis of oxygen isotope ratios in garnet is possible if appropriate standards are employed to correct for instrumental bias, a component of which depends on the cation chemistry of the analyzed by: ().
"The Development of a Multi-Collector Ion Microprobe for the study of Oxygen Isotopes in Nature." (πιβλέπων: Prof. Grenville Turner) ;αν 89 – Σπ [ (@έθοδος II, με έρευνα). Πανεπιστήμιο του Manchester, Αγγλίας, Τομέας πιστημών της 3ης (). An ion microprobe study of oxygen isotopes in some inclusions in Kainsaz and Y CO3 chondrites.
Authors: Hiyagon, H. Publication: Antarctic Meteorites XXV. Papers presented to the 25th Symposium on Antarctic Meteorites, NIPR, Tokyo, June, p. Publication Date: 00/ Category: Meteorites: Origin: METBASE: Keywords. SOLID oxide electrolytes with predominantly oxide ion (O2−) conductivity should show isotope effects resulting from the different mobilities of 16O, 17O and 18O through the anion by: 1.
Ion Microprobe Analysis of Oxygen, Carbon, and Hydrogen Isotope Ratios. multi-collector ion microprobe, IMS used for oxygen isotopes. All samples were analyzed for U-Pb geochronology using the large geometry CAMECA IMS ion microprobe at the NordSIM Facility housed at the Swedish Museum of Natural History, Stockholm, by: The nature of the superconducting pairing mechanism in the high-temperature superconducting oxides is still an open question.
Shortly after Cited by: ABSTRACT This award will provide support for WiscSIMS, the Wisconsin Secondary-Ion Mass-Spectrometer National Ion Microprobe Facility. This laboratory houses the first, new-generation, CAMECA ims ion microprobe and is rapidly expanding its leadership role as a center of excellence for stable isotope geochemistry.
Ion microprobe analysis of one grain shows a gradient of 13‰ over μm and a greater range in δ 18 O than all quartz previously analyzed on the Isle of Skye. Other crystals from the same outcrop are homogeneous. Digitized cathodoluminescence images reveal patterns of magmatic zoning and brittle fracturing not otherwise by: Oxygen, carbon, and hydrogen are the most abundant elements in mineralizing fluids, and their isotope ratios provide a powerful tool for deciphering the complex histories of mineralizing systems (see Ohmoto, ; Kerrich, ; Taylor, ; Hebert and Ho, ).
In particular, stable isotope ratios can be used to constrain theories of fluid sources, pathways, and fluxes, mechanisms of Cited by: ADS Classic is now deprecated. It will be completely retired in October Please redirect your searches to the new ADS modern form or the classic info can be found on our blog.
The analytical capabilities of the ims ion microprobe (SIMS) in determining O and C isotope compositions in biogenic carbonate samples have been tested.
Results indicated that, with a spot size of ≊ 30 μm, the average reproducibility at the 1s level was ‰ for oxygen isotopes and ‰ for carbon by: Hafnium isotope ratios obtained from zircons in southern West Greenland suggest that Earth’s ancient crustal growth changed around Gyr ago. The quantitative analyses and other applications described in this article indicate a useful future for the ionmicroprobe mass analyzer in many areas of the science of solid materials.
It should be possible to analyze all the elements quantitatively, but detection sensitivities will vary depending on the matrix, the element, and the polarity of the sputtered ion being by: Ion microprobe analysis of oxygen isotope ratios in granulite facies magnetites: diffusive exchange as a guide to cooling history John W.
Valley I and Colin M. Graham 2. MAC37 (EL3) for oxygen isotope analysis. Element maps for all sections, BSE images of each clast and major mineral compositions (WDS) were collected using a combination of the Cameca SX electron probe (AMNH) and the JEOL DSM SEM (CUNY).
Oxygen isotopes silicates were analyzed in situ, using the Cameca IMS ion microprobe at the.The development of new techniques and instrumentation on the ANU SHRIMP II ion microprobe has made it possible to measure the oxygen isotope ratios of insulating and conducting phases (e.g.The rate of continental crust formation and the nature of the processes involved are the subjects of much debate.
The crux of the problem is reconciling the apparently contradictory and incomplete Cited by: