Sensitive High Resolution Ion Microprobe (SHRIMP IIe/MC) of the Institute of Geosciences of the University of São Paulo, Brazil: analytical method and first results

Authors

  • Kei Sato Universidade de São Paulo; Instituto de Geociências
  • Colombo Celso Gaeta Tassinari Universidade de São Paulo; Instituto de Geociências
  • Miguel Angelo Stipp Basei Universidade de São Paulo; Instituto de Geociências
  • Oswaldo Siga Júnior Universidade de São Paulo; Instituto de Geociências
  • Artur Takashi Onoe Universidade de São Paulo; Instituto de Geociências
  • Maurício Dias de Souza Universidade de São Paulo; Instituto de Geociências

DOI:

https://doi.org/10.5327/Z1519-874X201400030001

Abstract

This paper presents the characteristics of the high resolution secondary ion mass spectrometer coupled with an Ion Microprobe (SHRIMP IIe/MC), installed at the Institute of Geosciences of the University of São Paulo (IGc-USP), as well as the respective analytical procedures and the first results obtained with standard samples, making possible to conduct routine analysis of zircon samples. The standard of the Temora 2 zircon, with age of 416.78 Ma, was analyzed by the SHRIMP IIe/MC at the Institute of Geosciences of the University of São Paulo and yielded the age of 416.8 ± 3.8 Ma. Samples of the Archean zircon OG1 and the Neoproterozoic zircon Z6266, which yielded U-Pb ages of 3465.4 ± 0.6 Ma and of 559 ± 0.2 Ma, respectively, using Thermal Ionization Mass Spectrometry (TIMS), were analyzed by SHRIMP IIe/MC at the IG-USP and yielded U-Pb ages of 3462.6 ± 5.1 Ma and 561.0 ± 0.92 Ma, respectively, in Concordia diagrams. Therefore, these values and the literature values are very close. Both OG1 and Z6266 samples, due to the homogeneity in their composition and isotopic relationship, can be used as SHRIMP standard. These results indicate that data obtained using SHRIMP IIe at the IGc-USP are reliable and compatible with international standards. Dating of samples with ages ranging from Cenozoic to Archean, obtained using SHRIMP IIe/MC U-Pb geochronology on zircon crystals, is presented here to illustrate this point.

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Published

2014-09-01

Issue

Vol. 14 No. 3 (2014)

Section

Articles

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How to Cite

Sato, K., Tassinari, C. C. G., Basei, M. A. S., Siga Júnior, O., Onoe, A. T., & Souza, M. D. de. (2014). Sensitive High Resolution Ion Microprobe (SHRIMP IIe/MC) of the Institute of Geosciences of the University of São Paulo, Brazil: analytical method and first results . Geologia USP. Série Científica, 14(3), 3-18. https://doi.org/10.5327/Z1519-874X201400030001