isochron
/ˈʌɪsə(ʊ)krɒn
/noun chiefly Geology
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.
Origin
Late 17th century (as an adjective in the sense 'isochronous'): from Greek isokhronos, from isos 'equal' + khronos 'time'.
- count something out
- count the cost
- count the days (or hours)
- count the pennies
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