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A line on a diagram or map connecting points relating to the same time or equal times.
- ‘Age of movement has been deduced from Rb-Sr mineral isochrons.’
- ‘An isochron defined by only two rutile points yields an age of 384 + / - 4 Ma.’
- ‘Steve Austin describes the three methods of radioactive dating: 1) the model age, 2) the whole rock isochron, and 3) the mineral isochron.’
- ‘But now we know that meaningless isochrons can be ‘inherited’ from pre-existing rocks.’
- ‘Although areas of slow propagation (crowding of isochrones) can be identified, no reentrant activity can be seen on the surface.’
Late 17th century (as an adjective in the sense ‘isochronous’): from Greek isokhronos, from isos ‘equal’ + khronos ‘time’.
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