Dictionary

isochron en · NOUN

Etymology

Etymology tree Ancient Greek ῐ̓́σος (ĭ́sos)lbor. English iso- English chron English isochron From iso- + chron.

Meanings

1. (qualifier: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. 1997, H.-G. Attendorn, R. Bowen, Radioactive and Stable Isotope Geology, Chapman & Hall, page 163:
2. (qualifier: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. 2007, Eugene M. Izhikevich, Dynamical Systems in Neuroscience, The MIT Press, page 446:

Forms

Deriveds

isochron dating · isochron diagram

Relateds

isochrone · isochronism · isochronous · isochrony

Translations (2)

de Isochrone (collection of points representing initial conditions of a dynamical system) · de Isochrone (line on a chart linking rock of the same age)