Oxygen- and magnesium-isotope compositions of calcium–aluminum-rich inclusions from CR2 carbonaceous chondrites
Makide, Kentaro, Nagashima, Kazuhide, Krot, Alexander N., , Bischoff, Addi(2009). Oxygen- and magnesium-isotope compositions of calcium–aluminum-rich inclusions from CR2 carbonaceous chondrites. Geochimica et Cosmochimica Acta, 73(17). https://doi.org/10.1016/j.gca.2009.01.042
Datasets
| number | title | Methods | variables analyzed | ||
|---|---|---|---|---|---|
| 2 | Oxygen-isotope compositions (in per mil) of individual minerals in CR2 CAIs | SIMS | DELTA_O18, DELTA_O17, CAP_DELTA_O17 | ||
| 3 | Magnesium-isotope data for CR2 CAIs | CALC, IMP | DELTA_Mg25, DELTA_Mg26, Al27_Mg24 | ||
| EA1 | Representative microprobe analyses of hibonite, grossite, perovskite, spinel and anorthite in CR2 CAIs | EMP | FeO, CaO, Al2O3, TiO2, TOTAL, Cr2O3, MgO, SiO2 | ||
| EA2 | Representative microprobe analyses of melilite in CR2 CAIs | EMP | Al2O3, SiO2, TOTAL, MgO, CaO, FeO, TiO2 | ||
| EA3 | Representative microprobe analyses of Al, Ti-diopside in CR2 CAIs | EMP | TOTAL, MgO, Al2O3, Cr2O3, CaO, SiO2, TiO2, FeO | ||
Methods
| method name | laboratory | method comment | More details are available for the following variables | ||
|---|---|---|---|---|---|
| CALCULATED | UNIVERSITY OF HAWAII | fractionation-corrected delta Mg Magnesium-isotope compositions are reported as deviations in parts per thousand (&) from the terrestrial magnesium isotopic ratios [25Mg/24Mg = 0.12663, 26Mg/24Mg = 0.13932 (Catanzaro et al., 1966) | |||
| ELECTRON MICROPROBE | UNIVERSITY OF HAWAII | Cameca SX-50 electron microprobe using a 15 keV accelerating voltage, 10–20 nA beam current, beam size of ~1– 2 lm and wavelength dispersive X-ray spectroscopy | Cr2O3[MAJ], FeO[MAJ] | ||
| ION MICROPROBE | UNIVERSITY OF HAWAII | in situ with the UH Cameca ims-1280 ion microprobe using primary 16O ion beam accelerated to 13 keV with an impact energy of 23 keV. Positively charged secondary ions were accelerated to +10 keV and an energy window of 50 eV was used | |||
| SECONDARY ION MASS SPECTROMETRY | UNIVERSITY OF HAWAII | Cameca ims-1280 ion microprobe using primary Cs+ ion beam accelerated to 10 keV and impacted the sample with an energy of 20 keV. Negatively charged secondary ions were accelerated to ~10 keV and an energy window of 50 eV was used | |||
