Metamorphic rates in collisional orogeny from in situ allanite and monazite dating
The prograde sequence of rare earth minerals recorded in metapelites during regional metamorphism reveals a series of irreversible reactions among silicates and phosphates. In individual samples from the northern Lepontine (Central Alps), allanite is partly replaced by monazite at 560-580 °C. Relic allanite retains its characteristic growth zoning acquired at greenschist facies conditions (430-450 °C). Coexisting monazite and allanite were dated in situ to delimit in time successive stages of...[Show more]
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