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Previous Courses (faculty only)Community Tools Hide blocks standard view Drag the correct number below onto the LETTER corresponding to the correct sochron on the graph: 1. Isochron at the formation of geological feature being sampled 2. Isochron indicating the greatest amount of time elapsed since the formation of the geological feature ect of ion 3. If line "C represents the age of the Earth, the isochron that you would see if you drove your time machine about a billion years into the past. 87Rb/86Sr Your answer is partially correct. You have correctly selected 1.

Explanation / Answer

Isochron is a method of radiometric dating. The rubidium-strontium dating is done by plotting the ratio of 87Sr/86Sr against 87Rb/86Rb. The slope of the line indicates the age of the sample. Therefore, in the given diagram, the point 2 corresponds to the line B and point 3 represents the line A.

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