Definition of isochron in English:


Pronunciation /ˈīsəˌkrän/ /ˈaɪsəˌkrɑn/


  • 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’.