CLEO: Common lead evaluation using Octave

Common lead isotopic data can provide important information on the history and the evolution of geological samples. Evaluation of common lead datasets need specific calculations e.g. iterative Pb 207 / Pb 206 age calculation, linear regression with correlated errors and sometimes principal component...

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Bibliographic Details
Published in:Computers & geosciences 2006-08, Vol.32 (7), p.993-1003
Main Authors: Gaab, A.S., Todt, W., Poller, U.
Format: Article
Language:English
Subjects:
Crystalline rocks
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geochemical modeling
Geochronology
Igneous and metamorphic rocks petrology, volcanic processes, magmas
Isotope geochemistry. Geochronology
Lead isotopes
Magmatic fractionation
Octave
Principal component analysis
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Summary:Common lead isotopic data can provide important information on the history and the evolution of geological samples. Evaluation of common lead datasets need specific calculations e.g. iterative Pb 207 / Pb 206 age calculation, linear regression with correlated errors and sometimes principal component analysis (PCA). These calculations can be performed by modern computers, but a set of pre-defined functions would be helpful, as these calculations are not always trivial. This paper presents an implementation of some basic functions for Octave, a GNU public license program, for the evaluation of common lead data. To show the capability of the script, a common lead dataset for the Dlhá Dolina intrusion is presented and evaluated using CLEO. The timing of this evolved magmatic body can be constrained by the WR–Pb–Pb method to a minimum age of 231 ± 6.5 Ma .
ISSN:0098-3004
1873-7803
DOI:10.1016/j.cageo.2005.10.014