Chapter

Geochemical Modelling of Igneous Processes – Principles And Recipes in R Language

Part of the series Springer Geochemistry pp 167-168

Date:

Reverse Models

  • Vojtěch JanoušekAffiliated withCzech Geological Survey Email author 
  • , Jean-François MoyenAffiliated withUniversité Jean-Monnet
  • , Hervé MartinAffiliated withUniversité Blaise-Pascal
  • , Vojtěch ErbanAffiliated withCzech Geological Survey
  • , Colin FarrowAffiliated with

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Abstract

This rather short chapter explains fundamentals of fitting binary mixing hyperbolae to real data arrays (e.g., in 87Sr/86Sr vs. 143Nd/144Nd plots). This is done by the least-square method, and the outputs are asymptotes with curvature. The second part of the text presents reverse solution of the AFC as described by Powell (1984), using the slope of the mixing line in the 1/C vs. I diagram (e.g., 1/Sr vs. 87Sr/86Sr plot).