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The determination of strontium isotope ratios by means of quadrupole-based ICP-mass spectrometry: a geochronological case study

Frank Vanhaecke UGent, Günther De Wannemacker, Luc Moens UGent and Jan Hertogen (1999) JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY. 14(11). p.1691-1696
abstract
Quadrupole-based ICP-mass spectrometry (ICP-QMS) was used for the determination of Sr-87/Sr-86 isotope ratios in digests of rock samples originating from two magmatic silicate rock formations of the Vosges (the Kagenfels granite and the Nideck rhyolite). The rock formations studied are geographically close to one another and, overall, they show a similar chemical composition. In a preliminary study, the effect of various data acquisition parameters on the isotope ratio precision was systematically studied, permitting optimum conditions to be selected. Rh was used as an internal standard, allowing the blank correction to be made accurately. Cation exchange chromatography was used to avoid isobaric overlap of Rb-87(+) and Sr-87(+) ion signals to the largest possible extent, while mathematical correction was applied to correct for the remaining interference. The accuracy of the method developed was evaluated by means of isotopic analysis of an oceanic gabbro sample, for which the Sr-87/Sr-86 isotope ratio was previously characterized by means of thermal ionisation mass spectrometry (TIMS). An excellent agreement between the ICP-QMS and TIMS values was established. On the basis of the isochrons, constructed using the Sr-87/Sr-86 isotope ratio results and the contents of Rb and Sr (determined by energy-dispersive X-ray fluorescence spectrometry) obtained for the Kagenfels and Nideck samples, it could be concluded that for both rock formations, secondary processes (e.g., recrystallisation, high- and low-temperature alteration) have disturbed the Rb-Sr isotopic system. As a consequence, the uncertainties on (i) the initial Sr-87/Sr-86 isotope ratios and (ii) the ages thus determined are large. Nevertheless, the estimated ages appear to be geologically relevant and provide information on the timing of geological events that affected the rocks several tens of million years after the initial formation. Overall, this case study shows the merits of ICP-QMS for exploratory studies of Sr isotope systematics and geochronology in cases with sufficient variation in the Sr-87/Sr-86 isotope ratios.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
DATA-ACQUISITION, INDUCTIVELY-COUPLED PLASMA, LASER-ABLATION, MS, OPTIMIZATION, PRECISION, ACCURACY, ELEMENTS, RHENIUM
journal title
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
J. Anal. At. Spectrom.
volume
14
issue
11
pages
1691 - 1696
Web of Science type
Article
Web of Science id
000083208000005
ISSN
0267-9477
DOI
10.1039/a905184h
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
112402
handle
http://hdl.handle.net/1854/LU-112402
date created
2004-01-14 13:35:00
date last changed
2012-11-21 10:01:00
@article{112402,
  abstract     = {Quadrupole-based ICP-mass spectrometry (ICP-QMS) was used for the determination of Sr-87/Sr-86 isotope ratios in digests of rock samples originating from two magmatic silicate rock formations of the Vosges (the Kagenfels granite and the Nideck rhyolite). The rock formations studied are geographically close to one another and, overall, they show a similar chemical composition. In a preliminary study, the effect of various data acquisition parameters on the isotope ratio precision was systematically studied, permitting optimum conditions to be selected. Rh was used as an internal standard, allowing the blank correction to be made accurately. Cation exchange chromatography was used to avoid isobaric overlap of Rb-87(+) and Sr-87(+) ion signals to the largest possible extent, while mathematical correction was applied to correct for the remaining interference. The accuracy of the method developed was evaluated by means of isotopic analysis of an oceanic gabbro sample, for which the Sr-87/Sr-86 isotope ratio was previously characterized by means of thermal ionisation mass spectrometry (TIMS). An excellent agreement between the ICP-QMS and TIMS values was established. On the basis of the isochrons, constructed using the Sr-87/Sr-86 isotope ratio results and the contents of Rb and Sr (determined by energy-dispersive X-ray fluorescence spectrometry) obtained for the Kagenfels and Nideck samples, it could be concluded that for both rock formations, secondary processes (e.g., recrystallisation, high- and low-temperature alteration) have disturbed the Rb-Sr isotopic system. As a consequence, the uncertainties on (i) the initial Sr-87/Sr-86 isotope ratios and (ii) the ages thus determined are large. Nevertheless, the estimated ages appear to be geologically relevant and provide information on the timing of geological events that affected the rocks several tens of million years after the initial formation. Overall, this case study shows the merits of ICP-QMS for exploratory studies of Sr isotope systematics and geochronology in cases with sufficient variation in the Sr-87/Sr-86 isotope ratios.},
  author       = {Vanhaecke, Frank and De Wannemacker, G{\"u}nther and Moens, Luc and Hertogen, Jan},
  issn         = {0267-9477},
  journal      = {JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY},
  keyword      = {DATA-ACQUISITION,INDUCTIVELY-COUPLED PLASMA,LASER-ABLATION,MS,OPTIMIZATION,PRECISION,ACCURACY,ELEMENTS,RHENIUM},
  language     = {eng},
  number       = {11},
  pages        = {1691--1696},
  title        = {The determination of strontium isotope ratios by means of quadrupole-based ICP-mass spectrometry: a geochronological case study},
  url          = {http://dx.doi.org/10.1039/a905184h},
  volume       = {14},
  year         = {1999},
}

Chicago
Vanhaecke, Frank, Günther De Wannemacker, Luc Moens, and Jan Hertogen. 1999. “The Determination of Strontium Isotope Ratios by Means of Quadrupole-based ICP-mass Spectrometry: a Geochronological Case Study.” Journal of Analytical Atomic Spectrometry 14 (11): 1691–1696.
APA
Vanhaecke, Frank, De Wannemacker, G., Moens, L., & Hertogen, J. (1999). The determination of strontium isotope ratios by means of quadrupole-based ICP-mass spectrometry: a geochronological case study. JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, 14(11), 1691–1696.
Vancouver
1.
Vanhaecke F, De Wannemacker G, Moens L, Hertogen J. The determination of strontium isotope ratios by means of quadrupole-based ICP-mass spectrometry: a geochronological case study. JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY. 1999;14(11):1691–6.
MLA
Vanhaecke, Frank, Günther De Wannemacker, Luc Moens, et al. “The Determination of Strontium Isotope Ratios by Means of Quadrupole-based ICP-mass Spectrometry: a Geochronological Case Study.” JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY 14.11 (1999): 1691–1696. Print.