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plural isochrons
(geology, geochemistry) A line on a chart linking rock of the same age (as determined from isotope ratios). quotations
Recapitulating, any suite of comagmatic rocks with an age t {\displaystyle t} defines an isochron if its members all had the same initial Sr 87 / 86 Sr {\displaystyle {\ce {^{87}Sr/^{86}Sr}}} ratio and if it was closed to both Rb {\displaystyle {\ce {Rb}}} and Sr {\displaystyle {\ce {Sr}}} since crystallization occurred and neither element was introduced from any extraneous source. […] In this way, whole-rock Rb − Sr {\displaystyle {\ce {Rb-Sr}}} isochrons can produce rather reliable age data for rock samples.
1997, H.-G. Attendorn, R. Bowen, Radioactive and Stable Isotope Geology, Chapman & Hall, page 163
(mathematics, dynamical systems) A collection of points (such as a manifold), each point representing a set of initial conditions for a given dynamical system, such that every set results in the same long-term behaviour of the system. quotations examples
The entire plane is foliated by isochrons.
2007, Eugene M. Izhikevich, Dynamical Systems in Neuroscience, The MIT Press, page 446