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Issue 5, 2010
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A practical method for determination of molybdenite Re-Os age by inductively coupled plasma-mass spectrometry combined with Carius tube-HNO3 digestion

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Abstract

A simplified method for the determination of molybdenite Re-Os ages using inductively coupled plasma-mass spectrometry (ICP-MS) is presented. By the means of Carius tube method, molybdenite and pyrite were digested using concentrated HNO3, and were then changed into MoO3 and Fe(NO3)3 precipitates, respectively. Rhenium was determined directly by ICP-MS after removal of Os by heating for the molybdenite supernatant or by cation-exchange purification for the pyrite supernatant. Osmium distilled as OsO4 from the supernatant was trapped using pure water and could be directly analyzed by ICP-MS. This method was validated using two molybdenite reference materials, GBW 04435 and GBW 04436, and their Re-Os ages obtained are 220.3 ± 1.1 Ma (1.0%, 2s), and 140.5 ± 0.9 Ma (1.2%, 2s), respectively, consistent with literature values. The proposed Re-Os dating method was applied to molybdenite and pyrite sampled from a porphyry Mo-deposit. The results show that this deposit is the oldest Mo-deposit so far found in China.

Graphical abstract: A practical method for determination of molybdenite Re-Os age by inductively coupled plasma-mass spectrometry combined with Carius tube-HNO3 digestion

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Publication details

The article was received on 17 Nov 2009, accepted on 26 Jan 2010 and first published on 10 Feb 2010


Article type: Technical Note
DOI: 10.1039/B9AY00258H
Citation: Anal. Methods, 2010,2, 575-581
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    A practical method for determination of molybdenite Re-Os age by inductively coupled plasma-mass spectrometry combined with Carius tube-HNO3 digestion

    Y. Sun, P. Xu, J. Li, K. He, Z. Chu and C. Y. Wang, Anal. Methods, 2010, 2, 575
    DOI: 10.1039/B9AY00258H

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