Cooling and exhumation of the Shuswap Metamorphic Core Complex constrained by 40 Ar/ 39 Ar thermochronology
The exhumation history of the Shuswap Metamorphic Core Complex (Shuswap MCC) is deciphered from structural analysis and 40Ar/39Ar thermochronology. With the exception of a few samples contaminated by excess argon, the analytical results indicate a consistent range of early Tertiary 40Ar/39Ar ages throughout the area. Hornblende yields ages ranging from ∼59-54 Ma; muscovite and biotite ages are clustered between 49.5 and 48 Ma, and are consistent with the timing of closure of K-feldspars,...[Show more]
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|Source:||Geological Society of America Bulletin|
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