| 1. | In an isochron dating plot, the Al / Mg ratio plotted is /.
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| 2. | If all data points lie on a straight line, this line is called an isochron.
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| 3. | The isochron ages of these sills and dikes and the Cardenas Basalt lavas are basically identical.
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| 4. | Dating is achieved usually by trying to produce an isochron of several minerals within a rock specimen.
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| 5. | Ferroan anorthosites have been dated using the internal isochron method at " circa " 4.4 Ga.
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| 6. | As illustrated in figure 1, this point defines the lower ( left ) end of the isochron.
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| 7. | To mitigate this effect it is usual to date several minerals in the same sample, to provide an isochron.
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| 8. | Together, these samples define an isochron, whose slope gives the age of meteorites as 4.55 Byr.
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| 9. | Lead isotope isochron diagram used by C . C . Patterson to determine the age of the Earth in 1956.
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| 10. | Plotting an isochron is used to solve the age equation graphically and calculate the age of the sample and the original composition.
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