Use this geological calculation for a transparent first-pass interpretation of measured rock, soil, fluid, well, stratigraphic, isotopic, geophysical, or seismic data under an explicitly selected model.

lanthanum ppm

La (lanthanum) concentration in parts per million.

cerium ppm

Ce (cerium) concentration in parts per million.

praseodymium ppm

Pr (praseodymium) concentration in parts per million.

neodymium ppm

Nd (neodymium) concentration in parts per million.

samarium ppm

Sm (samarium) concentration in parts per million.

europium ppm

Eu (europium) concentration in parts per million.

gadolinium ppm

Gd (gadolinium) concentration in parts per million.

terbium ppm

Tb (terbium) concentration in parts per million.

dysprosium ppm

Dy (dysprosium) concentration in parts per million.

holmium ppm

Ho (holmium) concentration in parts per million.

erbium ppm

Er (erbium) concentration in parts per million.

thulium ppm

Tm (thulium) concentration in parts per million.

ytterbium ppm

Yb (ytterbium) concentration in parts per million.

lutetium ppm

Lu (lutetium) concentration in parts per million.

Reference

Reference material for normalization.

Normalize rare earth element concentrations to chondrite or PAAS and report Ce and Eu anomalies. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Normalized values

Normalized values ordered La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu.

Ce anomaly

Cerium anomaly Ce/Ce* against the geometric mean of La and Pr.

Eu anomaly

Europium anomaly Eu/Eu* against the geometric mean of Sm and Gd.

• Classification diagrams and geochemical ratios require appropriate normalization, oxidation-state treatment, volatile basis, analytical quality, alteration screening, mineral or whole-rock context, and a composition within the method's calibration domain.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Compare independent measurements and models, retain units and analytical metadata, propagate uncertainty, and validate interpretations against logs, cores, maps, laboratory data, or field observations.

• REE Anomaly Ce Calculator

  Compute the chondrite- or PAAS-normalized cerium anomaly Ce/Ce* from La, Ce and Pr concentrations.

• REE Anomaly Eu Calculator

  Compute the chondrite- or PAAS-normalized europium anomaly Eu/Eu* from Sm, Eu and Gd concentrations.

• Spider Diagram Normalization Calculator

  Normalize incompatible-trace-element concentrations to the Sun and McDonough (1989) primitive mantle for spider diagrams.