Concordia

Have you heard about the sinking of the Costa Concordia luxury cruise ship?

Salvage workers have begun an effort to upright the wrecked cruise ship Costa Concordia, which ran aground 20 months ago off the coast of Italy.

Points above concordia indicate uranium loss and those below indicate uranium gain.

1994 [1988 Elsevier], H.-G. Attendorn, R. Bowen, Isotopes in the Earth Sciences, Chapman & Hall, page 131, Such lower intersections of resultant discordias with U-Th-Pb concordias are not significant in terms of geological time, merely changes which took place in the Th/U ratios or lead isotope ratios through the factors alluded to above.

The addition of U to a carbonate sample on concordia causes the point to move off concordia in the direction of the origin.[…]The patterns that develop in the ^{₂₃₁}Pa-^{₂₃₀}Th concordia diagrams are similar to the responses of Pa-Th concordias presented in Section 10.5a.