Oxygen Isotopic Ratios for Ultramafic Xenoliths from the Korean Peninsula

Lee, Jeong-A; Kim, Kyu-Han; Lee, Jong-Ik; Choo, Mikyung

doi:10.5467/jkess.2013.34.1.28

Cited by 3 publications

(1 citation statement)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The three oxygen isotope analytical system for silicates using a CO 2 laser‐BrF 5 fluorination at the Korea Polar Research Institute (KOPRI, Incheon, Republic of Korea) was installed in 2007 and has been used for the measurement of the oxygen isotopes of terrestrial and extraterrestrial rocks and minerals . Recently, the system has been replaced completely, with a new metal vacuum line for O 2 extraction and purification.…”

Section: System Descriptionmentioning

confidence: 99%

An automated laser fluorination technique for high‐precision analysis of three oxygen isotopes in silicates

Kim

Kusakabe

Park

et al. 2019

Rapid Comm Mass Spectrometry

View full text Add to dashboard Cite

Rationale The three oxygen isotopes in terrestrial/extraterrestrial silicates can provide geochemical and cosmochemical information about their origin and secondary processes that result from isotopic exchange. A laser fluorination technique has been widely used to extract oxygen from silicates for δ17O and δ18O measurements by isotope ratio mass spectrometry. Continued improvement of the techniques is still important for high‐precision measurement of oxygen‐isotopic ratios. Methods We adopted an automated lasing technique to obtain reproducible fluorination of silicates using a CO2 laser‐BrF5 fluorination system connected online to an isotope ratio mass spectrometer. The automated lasing technique enables us to perform high‐precision analysis of the three oxygen isotopes of typical reference materials (e.g., UWG2 garnet, NBS28 quartz and San Carlos olivine) and in‐house references (mid‐ocean ridge basalt glass and obsidian). The technique uses a built‐in application of laser control with which the laser power can be varied in a programmed manner with a defocused beam which is in a fixed position. Results The oxygen isotope ratios of some international reference materials analyzed by the manual lasing technique were found to be isotopically lighter with wider variations in δ18O values, whereas those measured by the automated lasing technique gave better reproducibility (less than 0.2‰, 2SD). The Δ17O values, an excess of the δ17O value relative to the fractionation line, also showed high reproducibility (±0.02‰, 2SD). Conclusions The system described herein provides high‐precision δ17O and δ18O measurements of silicate materials. The use of the automated lasing technique followed by careful and controlled purification procedures is preferred to achieve satisfactory isotopic ratio results.

show abstract

Section: System Descriptionmentioning

confidence: 99%