Geochronology - The Solid Earth - page 266

10. Fission-track dating on four minerals from one rock sequence yielded the following
dates: zircon, 653 Ma; sphene, 646 Ma; hornblende, 309 Ma; and apatite, 299 Ma.
Comment on the cooling history of this rock. If you could have one isotopic date
determined for these rocks, which method would you choose and why?
References and bibliography
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