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concordia diagram

名詞

concordia diagram (複数形 concordia diagrams)

(geology, geochronology) Any of several types of diagram, used in connection with uranium–lead dating, in which each axis encodes differently sourced information about the radiometric age of the mineral being dated.
- 1991, G. Brent Dalrymple, The Age of the Earth, Stanford University Press, page 117,
  The graphing of concordant U − Pb {\displaystyle {\ce {U-Pb}}} ${\ce {U-Pb}}$ data on a concordia diagram does not provide any information that is not obvious from the individual U − Pb {\displaystyle {\ce {U-Pb}}} ${\ce {U-Pb}}$ ages themselves. The principal value of the concordia diagram is its unique ability to yield crystallization ages from open systems.
- 2015, William M. White, Isotope Geochemistry, Wiley, page 78,
  A concordia diagram is simply a plot of Pb ∗ 206 / 238 U {\displaystyle {\ce {^{206}Pb^{\ast }/^{238}U}}} ${\ce {^{206}Pb^{\ast }/^{238}U}}$ versus Pb ∗ 207 / 235 U {\displaystyle {\ce {^{207}Pb^{\ast }/^{235}U}}} ${\ce {^{207}Pb^{\ast }/^{235}U}}$ ; that is, the number of atoms of radiogenic daughter produced to the number of atoms of radioactive parent. You should satisfy yourself that both of these ratios are proportional to time. In essence, the concordia diagram is a plot of the U 238 − 206 Pb {\displaystyle {\ce {^{238}U-\!^{206}Pb}}} ${\ce {^{238}U-\!^{206}Pb}}$ age against the U 235 − 207 Pb {\displaystyle {\ce {^{235}U-\!^{207}Pb}}} ${\ce {^{235}U-\!^{207}Pb}}$ age. The concordia curve on such a diagram […] is the locus of points where the U 238 − 206 Pb {\displaystyle {\ce {^{238}U-\!^{206}Pb}}} ${\ce {^{238}U-\!^{206}Pb}}$ age equals the U 235 − 207 Pb {\displaystyle {\ce {^{235}U-\!^{207}Pb}}} ${\ce {^{235}U-\!^{207}Pb}}$ age. Such ages are said to be concordant.
- 2018, Peter W. Reiners, Richard W. Carlson, Paul R. Renne, Kari M. Cooper, Darryl E. Granger, Noah M. McLean, Blair Schoene, Geochronology and Thermochronology, Wiley, page 177,
  Concordia diagrams are the most common way to present U − Pb {\displaystyle {\ce {U-Pb}}} ${\ce {U-Pb}}$ data in the modern literature, so understanding them is key to understanding the method.

使用する際の注意点

下位語

Tera–Wasserburg diagram, Tera–Wasserburg concordia diagram
Wetherill diagram, Wetherill concordia diagram

concordia diagramのページの著作権
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