isochron

名詞

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

日本語の意味

地質学・地球化学において、同位体比に基づいて同じ年代の岩石（または鉱物）のデータ点を結んだ線（等年代線）

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The lab report included an isochron linking several rock samples, indicating they formed at the same time.

Google翻訳 / DeepL翻訳

報告書には、同位体比によって決定された同じ年齢の複数の岩石試料を結ぶ等時線が示されており、それらが同時に形成されたことを示していた。

詳細

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.

Google翻訳 / DeepL翻訳

詳細

意味（2）

(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.