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SUMMARY:The magic of log ratios: A different look at geochemistry - Dr Max
  Frenzel - Helmholtz-Zentrum Dresden-Rossendorf
DTSTART:20250127T180000Z
DTEND:20250127T190000Z
UID:TALK227560@talks.cam.ac.uk
CONTACT:124546
DESCRIPTION:The compositions of Earth materials are usually described in t
 erms of specific components\, normalised to a whole. This means that indiv
 idual components must always be positive\, and their sum cannot exceed 100
 %. While these properties are obvious\, their wider implications are often
  misunderstood. In this talk\, I will first show how most geochemical data
 sets are not nearly as amenable to standard statistical analysis and inter
 pretation as they may initially appear. I will then show how the magic of 
 log-ratios can help us to address these difficulties. Finally\, I will dis
 cuss the physico-chemical meaning of log-ratios and give some examples of 
 how they can be used to better describe\, understand\, and model various g
 eochemical fractionation processes. This will inevitably raise questions r
 egarding the standard\, classical approaches still used for these tasks.
LOCATION:Harker 1 lecture room\, Department of Earth Sciences\, Downing Si
 te
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