Joint compositional calibration: a geochronological example

• Autores: Ramón Tolosana Delgado, K. G. van den Boogaart, E. Fiserova, Karel Hron, I. Dunk
• Localización: Proceedings of the 6th International Workshop on Compositional Data Analysis: Girona, 1-7 de juny de 2015 / coord. por Santiago Thió Fernández de Henestrosa, Josep Antoni Martín Fernández, 2015, ISBN 978-84-8458-451-3
• Idioma: inglés
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• Resumen

  • This contribution explores several issues arising in the measurement of a (geo)chemical composition, specially in the case that the quantities of interest are linear functions of (log)-ratios. This is the case of multi-isotopic geochronological analyses, where an age of a geological material is inferred as a function of several logratios in the isotopic system (Hg202, Pb204, Pb206, Pb207, Pb208, Th232, U235, U238), by using several ratios (e.g., Pb208/Pb206, Pb206/Pb204, Hg202/Pb204, U238/U235), quantities that are scaling invariant and subcompositionally coherent, but which in general cannot be estimated without taking into account additive noise effects incompatible with a purely compositional approach. The proposed ways to a solution heavily build upon the multiPoisson distribution, higlighting the counting nature of the readings delivered by these measuring machines