isochron

noun

(geology, geochemistry) A line on a chart linking rock of the same age (as determined from isotope ratios).

The isochron method is commonly used in geology to determine the age of rocks.

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意味（1）

(geology, geochemistry) A line on a chart linking rock of the same age (as determined from isotope ratios).

Recapitulating, any suite of comagmatic rocks with an age t defines an isochron if its members all had the same initial ^{₈₇}Sr/^{₈₆}Sr ratio and if it was closed to both Rb and Sr since crystallization occurred and neither element was introduced from any extraneous source. […] In this way, whole-rock Rb-Sr isochrons can produce rather reliable age data for rock samples.

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(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.

The entire plane is foliated by isochrons.

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isochron

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