The Concept of Compiled Data
Individual analyses -  Pre-compiled

Individual analyses

This option will return a data table that contains all analytical values available for the samples and for the chemical parameters you selected organized by reference and method. This means that each individual row of the result table will contain only those analytical values for a sample that were analyzed with the same method and reported in same reference.

If you select 'Individual Analyses', you will get a table that lists all analyses available for the samples and for the chemical items you selected organized by reference and method. If multiple measurements have been made for a certain chemical item on the same sample (e.g. Nb measured by different methods and published in different papers), they will all be listed in the table. One row in the data table will only contain values from one publication and only data acquired by the same method. A table with individual analyses will generally report data for the same sample in multiple rows.

Pre-compiled

This option will return a data table with only one row for each sample that contains a compilation of analytical values measured by different methods or reported in different references. If multiple values for the same chemical parameter exist, one of the values is selected on the basis of rules that we established (see below).

Example: You selected to get major elements, Nb, Rb, and Sr concentrations , and Sr and Nd isotope ratios for samples A,B, and C. Major elements analyzed by XRF and wet chemistry for these samples were published in reference 1, the trace elements analyzed by ICP-MS in reference 2, isotope ratios by mass spectrometry and Sr and Rb by isotope dilution MS in reference 3.

Sample Majors H2O Nb Rb Sr 87Sr/86Sr 143Nd/144Nd Method Ref
A XX             XRF 1
B YY             XRF 1
C ZZ             XRF 1
A   0.5           WET 1
B   0.4           WET 1
C   0.7           WET 1
A     0.3 2 98     ICP-MS 2
B     0.6 1.5 76     ICP-MS 2
C     0.5 1.7 82     ICP-MS 2
A           0.70305 0.51211 MS 3
B           0.70298 0.51193 MS 3
C           0.70311 0.51205 MS 3
A       1.98 96.8     MS-ID 3
B       1.45 74.2     MS-ID 3
C       1.80 83.5     MS-ID 3

   
Sample Majors H2O Nb Rb Sr 87Sr/86Sr 143Nd/144Nd Method Ref
A XX 0.5 0.3 1.98 96.8 0.70305 0.51211 XRF,etc 1,2,3
B YY 0.4 0.6 1.45 74.2 0.70298 0.51193 XRF,etc 1,2,3
C ZZ 0.7 0.5 1.80 83.5 0.70311 0.51205 XRF,etc 1,2,3


Rules to Select Data for Pre-Compilation
For isotope ratios:

  1. Publication year is compared. The latest value has the highest priority
  2. If there is more than one value published in the latest year, standard deviation is used as criteria.
For major elements, rare earth elements and other trace elements:
  1. Method: choose the values with highest method priority.
  2. If there is more than one value done by the same method (and which has the highest priority among all analyses for that element of that sample), then publication year is compared. The latest value has the highest priority
Method: listed below with priority from high to low.

Major elements:
  • XRF: X-RAY FLUORESCENCE
  • DCP: DIRECT CURRENT PLASMA
  • WET: WET CHEMISTRY
  • EMP: ELECTRON MICROPROBE
  • ES: EMISSION SPECTROMETRY
  • Other
Rare earth elements:
  • MS-ID: ISOTOPE DILUTION MASS SPECTROMETRY
  • MS: MASS SPECTROMETRY
  • ICPMS: INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY
  • DCP: DIRECT CURRENT PLASMA
  • SSMS: SPARC SOURCE MASS SPECTROMETRY
  • INAA: INSTRUMENTAL NEUTRON ACTIVATION ANALYSIS
  • Other
Other trace elements:
  • MS-ID: ISOTOPE DILUTION MASS SPECTROMETRY
  • MS: MASS SPECTROMETRY
  • ICPMS: INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY
  • SSMS: SPARC SOURCE MASS SPECTROMETRY
  • XRF: X-RAY FLUORESCENCE
  • DCP: DIRECT CURRENT PLASMA
  • INAA: INSTRUMENTAL NEUTRON ACTIVATION ANALYSIS
  • AAS: ATOMIC ABSORPTION
  • Other