TIMS Techniques for Measuring Strontium Isotope Ratios in Apatite Grains and Application to Igneous Rock Petrology
5 affiliations
- 1PPGG ‐ Programa de Pós‐graduação em Geociências (FGEL‐UERJ) Rio de Janeiro Brazil
- 2LAGIR ‐ Laboratório de Geocronologia e Isótopos Radiogênicos (FGEL‐UERJ) Rio de Janeiro Brazil
- 3TEKTOS ‐ Grupo de Pesquisa em Geotectônica (FGEL‐UERJ) Rio de Janeiro Brazil
- 4FAPERJ – Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro Rio de Janeiro Brazil
- 5CAp‐UERJ ‐ Departamento de Matemática e Desenho Universidade do Estado do Rio de Janeiro (UERJ) Rio de Janeiro Brazil
Abstract
Rationale: This study evaluates the potential of Sr isotopic compositions in apatite grains from magmatic rocks as a proxy for initial 87Sr/86Sr ratios, addressing the need for alternative approaches to conventional whole‐rock analyses in isotopic studies of granitoid systems.
Methods: Chemical and spectrometric procedures were optimized and validated for the determination of Sr isotopic ratios in apatite by TIMS. Three representative samples from the Ribeira Orogen, Brazil, were selected, and apatite Sr isotopic compositions were compared with initial whole‐rock 87Sr/86Sr ratios calculated from U–Pb zircon crystallization ages, whole‐rock isotopic ratios, and Rb and Sr concentrations. The reliability of the analytical approach was evaluated using the EN‐1 and Durango apatite reference materials.
Results: Apatite grains yielded Sr concentrations ranging from 80 to 950 μg g−1, with total Sr masses between 0.5 and 50 ng. Comparisons between apatite‐derived and whole‐rock initial 87Sr/86Sr ratios show isotopic variability below 0.05%, indicating high analytical precision. Validation results demonstrate consistent agreement between methods, with uncertainties within 0.5%.
Conclusions: The proposed TIMS‐based method for Sr isotope analysis in apatite grains provides a potential approach for investigating the initial Sr isotopic compositions of granitoid magmatic systems. This approach represents a cost‐effective and time‐efficient alternative to traditional whole‐rock analyses, with strong potential for large‐scale isotopic applications in orogenic terrains.
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BibTeX
@article{neto2026tims,
title = {{TIMS Techniques for Measuring Strontium Isotope Ratios in Apatite Grains and Application to Igneous Rock Petrology}},
author = {Carla Neto and Claudio de Morisson Valeriano and Gabriel Paravidini and Henrique Bruno and Manuela Carvalho and Rasec Almeida and Caroline Peixoto and Samuel Bersan and Mariana Carvalho and Monica Heilbron},
journal = {Rapid Communications in Mass Spectrometry},
year = {2026},
month = oct,
doi = {10.1002/rcm.70202},
url = {https://doi.org/10.1002/rcm.70202},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - TIMS Techniques for Measuring Strontium Isotope Ratios in Apatite Grains and Application to Igneous Rock Petrology
AU - Carla Neto
AU - Claudio de Morisson Valeriano
AU - Gabriel Paravidini
AU - Henrique Bruno
AU - Manuela Carvalho
AU - Rasec Almeida
AU - Caroline Peixoto
AU - Samuel Bersan
AU - Mariana Carvalho
AU - Monica Heilbron
PY - 2026
DA - 2026/10/25
JO - Rapid Communications in Mass Spectrometry
DO - 10.1002/rcm.70202
UR - https://doi.org/10.1002/rcm.70202
AB - Rationale: This study evaluates the potential of Sr isotopic compositions in apatite grains from magmatic rocks as a proxy for initial 87Sr/86Sr ratios, addressing the need for alternative approaches to conventional whole‐rock analyses in isotopic studies of granitoid systems. Methods: Chemical and spectrometric procedures were optimized and validated for the determination of Sr isotopic ratios in apatite by TIMS. Three representative samples from the Ribeira Orogen, Brazil, were selected, and apatite Sr isotopic compositions were compared with initial whole‐rock 87Sr/86Sr ratios calculated from U–Pb zircon crystallization ages, whole‐rock isotopic ratios, and Rb and Sr concentrations. The reliability of the analytical approach was evaluated using the EN‐1 and Durango apatite reference materials. Results: Apatite grains yielded Sr concentrations ranging from 80 to 950 μg g−1, with total Sr masses between 0.5 and 50 ng. Comparisons between apatite‐derived and whole‐rock initial 87Sr/86Sr ratios show isotopic variability below 0.05%, indicating high analytical precision. Validation results demonstrate consistent agreement between methods, with uncertainties within 0.5%. Conclusions: The proposed TIMS‐based method for Sr isotope analysis in apatite grains provides a potential approach for investigating the initial Sr isotopic compositions of granitoid magmatic systems. This approach represents a cost‐effective and time‐efficient alternative to traditional whole‐rock analyses, with strong potential for large‐scale isotopic applications in orogenic terrains.
SN - 0951-4198
SN - 1097-0231
ER -