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The Promise and Potential Pitfalls of Acid Leaching for Pb-Pb Chronology
Ito K & Iizuka T
Ito K & Iizuka T (2020) Goldschmidt Abstracts, 2020 1153
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06n: Room 2, View in program
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Have you observed meteorite pyroxenes that do not present lamellae or structures induced by solid state dissolution? If yes, what kind of pyroxenes these are? Can we expect isotopic fractionation in such cases?
Thank you for the questions. In this study, we used three achondrites (D'Orbigny, Ibitira and Northwest Africa 6704) and each pyroxene has different textural features and chemical compositions. D'Orbigny and Northwest Africa 6704 don't have evident lamellae structures and show only igneous textures (Mittlefehldt et al. 2002: Hibiya et al. 2019). Isotopic variation was not observed in previous works of Pb-Pb dating about these meteorites (Amelin. 2008: Amelin et al. 2019) and I think that the possibility of scattered Pb isotopes is lower than the case of meteorites which experienced secondary metamorphic events.
Nice work! In some cases, such as shown in Koefoed et al. 2015 LPSC, the positions of HF leachate and residue on the diagram do not always form a meaningful metamorphic isochron like in your model. Do you have an explanation on what might cause this?
Thanks, Yankun! I agree your opinions. I take it that you mention the positions of HF and residue of a bulk sample in Koefoed et al. 2015. As the case of whole rock is more complicated than single mineral, it is difficult to give an clear explanation. Some mechanisms such as isotopic fractionation during acid leaching or mixing trends between terrestrial contamination Pb which lies below isochron are needed to explain this. I think trace elements data (especially REEs) in leachates and residue is useful to understand what is going on in each leaching step and determine the cause of isotopic variation.
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