Deciphering a multi-event in a non-complex set of detrital zircon U/Pb ages

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The determination of U–Pb ages from detrital zircons of sedimentary rocks using LA–ICP–MS has been widely used to develop studies of provenance analysis. A problem that frequently arises is to find a population that appears to be noncomplex despite several perceptible age peaks in their spectrum. These peaks are qualitatively defined through diagrams of relative probability (probability density function or PDF), but it is difficult to quantify their statistical significance relative to a zircon-forming multipeak event. Therefore, the question arises as to whether we can decipher and characterize a multipeak event in a noncomplex set of detrital zircon U–Pb ages. This work is an attempt to answer the above question by means of a statistical analysis. The objectives are: (1) to determine the most appropriate minimum number of zircon age populations (peaks); (2) to characterize each peak in terms of age and event duration; and (3) to compare results obtained for two datasets showing similar zircon ages. The process starts by using a cluster analysis to group zircon ages into a set of consistent clusters. A Gaussian kernel function is then fitted to each cluster and summed to obtain a theoretical PDF. At the end of the process, the best modelled PDF must coincide with the original PDF at ≥95%, and the deciphered peaks can then be characterized.
Original languageUnknown
Title of host publicationSTRATI 2013: First International Congress on Stratigraphy: At the Cutting Edge of Stratigraphy
EditorsR Rocha, J Pais, S Finney, JC Kullberg
Place of PublicationHeidelberg
PublisherSpringer International Publishing
Pages717-722
ISBN (Print)978-3-319-04363-0/978-3-319-04364-7
Publication statusPublished - 1 Jan 2014

Publication series

NameSpringer Geology
PublisherSpringer International Publishing

Cite this

Chichorro, M. A. F. D. S. (2014). Deciphering a multi-event in a non-complex set of detrital zircon U/Pb ages. In R. Rocha, J. Pais, S. Finney, & JC. Kullberg (Eds.), STRATI 2013: First International Congress on Stratigraphy: At the Cutting Edge of Stratigraphy (pp. 717-722). (Springer Geology). Heidelberg: Springer International Publishing.