concordia
nounEtymology Borrowed from Latin concordia.
1
Geography, Geology, Natural sciences A set of plotted points, appearing as a curve on a concordia diagram or isochron diagram, representing sample data from rock of the same age; the condition of being a member of said set (or on said curve).
- Points above concordia indicate uranium loss and those below indicate uranium gain.1979, Contributions to Geology, Volumes 17-19; Volume 3, University of Wyoming, page 174:
- 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.
1 more example
- 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.2005, Gunter Faure, Teresa M. Mensing, Isotopes: Principles and Applications, 3rd edition, Wiley, page 521:
- Derived terms
- concordia diagram
- Related terms
- isochron
- Coordinate terms
- discordia