Simplified technique for the measurements of Re-Os isotope by multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS)

Abstract

A method for the rapid determination of Re-Os isotopes by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) was developed. For Os measurements, samples were introduced into the plasma through conventional solution mode. The main Os memory occurs in the nebulizer; therefore, the use of a glass nebulizer rather than a Teflon nebulizer leads to a significant reduction in the Os memory effect. The Os memory is quickly and easily eliminated by washing the inlet system with 5% HCl-EtOH. The external reproducibility of the 187 Os/ 188 Os ratio of the Johnson-Matthey Chemical ICP (JMC) Os standard solution, as measured using the multi-ion counter system, is 0.07% (2σ, n = 12) for analyte amounts ranging from 0.1 to 1 ng total Os. Using MC-ICP-MS, the mean values of 187 Os/ 188 Os obtained for standards were found to be within analytical uncertainty of values obtained by negative thermal ionization mass spectrometry (N-TIMS). An improved mass-fractionation correction technique using Ir was applied to the isotopic analysis of Re. The present methods demonstrate the feasibility of MC-ICP-MS for precision measurements of the 187 Re-187 Os isotope system.

Disequilibrium-induced initial Os isotopic heterogeneity in gram aliquots of single basaltic rock powders: Implications for dating and source tracing

“…Os was loaded onto Pt filaments and measured as OsO 3 − ions by negative-thermal ionization mass spectrometry (N-TIMS) using the electron multiplier mode on a Thermo-Finnigan Triton (Creaser et al, 1991;Volkening et al, 1991) Os value of 0.1202 ± 3 (2 SD, n = 12) for the period of analysis. These values are in good agreement with a value of 0.12022 ± 2 (2 SD, n = 14) measured on the same mass spectrometer in Faraday cup mode (Li et al, 2010).…”

Recycling of oceanic crust from a stagnant slab in the mantle transition zone: Evidence from Cenozoic continental basalts in Zhejiang Province, SE China

“…Three analyses on NISTSRM981 during ; (b) Cenozoic basalts and sample locations in Zhejiang Province, modified after Liu et al (2012b), and the whole-rock Ar-Ar age data come from Ho et al (2003); (c) East-west vertical cross section of P-wave velocity tomography along 29°N, indicating high and low-velocity zones beneath Zhejiang Province. The figure is slightly modified from Huang and Zhao (2006 Bulk-rock Re-Os isotopes were analyzed at the Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS), following the analytical procedures described by (Li et al, 2010). An ICP-MS (ThermoScientific Xseries-2) was used for isotope dilution analysis of Re.…”

Os isotopic evidence for a carbonaceous chondritic mantle source for the Nagqu ophiolite from Tibet and its implications

“…Re-Os isotopes were obtained by isotope dilution techniques at the Guangzhou Institute of Geochemistry, CAS, where an increasing volume of Re-Os isotopic data has been published [10,21,[39][40][41]. The experimental procedure is described by Li et al [4,42].…”