EarthRef.org Digital Archive (ERDA) -- The composition of the depleted mantle -- calculation spreadsheets

Description
This Microsoft Excel file contains four separate worksheets. The first worksheet 'Periodic table D-MORB' is the worksheet implementation of Figure 1 using the D-MORB estimate from the 'D-MORB.comp.xls' file. The calculated composition is displayed in the orange box in the columns labeled 'model' and these values are fixed. Changes in the constraining ratios (columns M and S) result in changes in the values in the 'Active' columns. The constraints derived from the isotopic compositions are described in the blue box and are linked to the appropriate ratios in the orange box. Changes in the isotope ratios (row 'MORB now' or changes in the average depletion age (X in years) results in changes in the constraining ratios and in the linked 'Active' cells. Some changes in the constraints will result in changes in Ce/Pb, La/Nb and Re/Yb. These ratios are displayed in the red box and for a viable model the 'Active' values should stay within the minimum and maximum. The worksheet labeled 'All MORB La < 5' and 'All-MORB' provides estimates based on the alternative compilations.

Project -- Earth Science Data Compilations -- Compendium of Geochemistry
The book focuses on compositional data and related references for such substances as solar photosphere, meteorites, igneous rocks, soils, sedimentary rocks, surficial waters, marine and terrestrial organisms (including humans), and aerosols. It emphasizes the use of original raw data as much as possible, and applies the statistical technique of factor analysis to elucidate any underlying interrelationships among chemical elements and given sample sets. Whenever applicable, simple chemical thermodynamic models are introduced to explain the observed partitioning of elements among different phases.