New techniques applied to the U-Pb Method at the Centre for Geochronological Research of the University of São Paulo: Chemical Digestions, TIMS Mass Spectrometry and Examples of Integrated Application of SHRIMP

Authors

  • Kei Sato Universidade de São Paulo; Instituto de Geociências; Centro de Pesquisas Geocronológicas
  • Miguel Angelo Stipp Basei Universidade de São Paulo; Instituto de Geociências; Centro de Pesquisas Geocronológicas
  • Oswaldo Siga Júnior Universidade de São Paulo; Instituto de Geociências; Centro de Pesquisas Geocronológicas
  • Walter Maurício Sproesser Universidade de São Paulo; Instituto de Geociências; Centro de Pesquisas Geocronológicas
  • Cláudia Regina Passarelli Universidade de São Paulo; Instituto de Geociências; Centro de Pesquisas Geocronológicas

DOI:

https://doi.org/10.5327/Z1519-874X2008000200006

Keywords:

zircon, geochronology, µHf, microwave oven, spike 205Pb, micro column, leaching

Abstract

The present work describes new techniques of U-Pb ID-TIMS developed at the CPGeo-IGc/USP. Techniques of partial and total chemical digestions, U and Pb concentration using anion exchange in a micro column, and the utilization of a 205Pb spike are discussed. Main geochronological equations used are also discussed. Examples of the application of U-Pb data, obtained by leaching technique using a microwave oven in zircon with isotopic inheritances in the core and border, are presented. The genesis of zircon based on the initial 176Hf/177Hf ratio is discussed. Finally complete listings of the mathematical formulations used in the PBDAT software are given in the appendix.

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Published

2008-10-01

Issue

Vol. 8 No. 2 (2008)

Section

Articles

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How to Cite

Sato, K., Basei, M. A. S., Siga Júnior, O., Sproesser, W. M., & Passarelli, C. R. (2008). New techniques applied to the U-Pb Method at the Centre for Geochronological Research of the University of São Paulo: Chemical Digestions, TIMS Mass Spectrometry and Examples of Integrated Application of SHRIMP . Geologia USP. Série Científica, 8(2), 76-99. https://doi.org/10.5327/Z1519-874X2008000200006