Concept of Precompiled Datasets

Multiple analyses of a sample reported in different publications are compiled so that for each whole-rock or volcanic glass sample only one value is displayed for a certain analyte. Multiple analyses of that element, oxide or ratio are compared by the following rules and only the value with highest priority is selected. Multiple analyses within the same publication are not compiled. Note that these compiled datasets will contain fewer records than a standard query result.

For isotope ratios:

• The publication years are compared. The most recent value has the highest priority.

For major elements, rare earth elements, and other trace elements:

1. The value with highest method priority is selected.
2. If several values have the highest priority, the publication years are compared. The most recent value is selected.

For age data and additional sample information:

• All distinct entries are reported, labelled by their respective publication.

Methods listed below with decreasing priority:

Major elements:

• XRF: X-RAY FLUORESCENCE
• WET: WET CHEMISTRY
• EMP: ELECTRON MICROPROBE
• AES: ATOMIC EMISSION SPECTROMETRY
• AAS: ATOMIC ABSORPTION SPECTROMETRY
• Others

Rare earth elements:

• TIMS, MS_ID: THERMAL IONIZATION - MASS SPECTROMETRY, ISOTOPE DILUTION -
• ICPMS: INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY
• AES: ATOMIC EMISSION SPECTROMETRY
• SSMS: SPARK SOURCE MASS SPECTROMETRY
• INAA: INSTRUMENTAL NEUTRON ACTIVATION ANALYSIS
• XRF: X-RAY FLUORESCENCE
• Others

Other trace elements:

• TIMS, MS-ID: THERMAL - IONIZATION MASS SPECTROMETRY, ISOTOPE DILUTION -
• ICPMS: INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY
• SSMS: SPARK SOURCE MASS SPECTROMETRY
• XRF: X-RAY FLUORESCENCE
• AES: ATOMIC EMISSION SPECTROMETRY
• INAA: INSTRUMENTAL NEUTRON ACTIVATION ANALYSIS
• AAS: ATOMIC ABSORPTION SPECTROMETRY
• SIMS: SECONDARY IONIZATION MASS SPECTROMETRY
• WET: WET CHEMISTRY
• Others