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Pronunciation varies by accent · noun
(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.
The entire plane is foliated by isochrons.
Use isochron when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Isochron means (geology, geochemistry) A line on a chart linking rock of the same age (as determined from isotope ratios)..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
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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