U pb dating of zircon

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The laser ablation pit sizes ranged from 30 to 40 μm in diameter.

Certainly it doesn’t make sense to say different zones within a tiny crystal formed at vastly different times.

By the same token, melt inclusions can be harnessed for insights into processes of magmatic degassing and assimiliation of hydrothermally altered magma chamber rinds. Work has been performed at La Pacana (Chile), the largest known terrestrial resurgent caldera, and at Toba (Indonesia), the source of a ~76 ka eruption thought by some to have pushed the then human population to the brink of extinction ( Rampino and Ambrose, 2000).

Ion microprobe group members are currently involved in studies of large-volume, Quaternary caldera systems underlying Long Valley and Yellowstone (U. Ion microprobe U-Pb zircon age results for the Bishop Tuff (Long Valley; Reid and Coath, 2000) and La Pacana (Schmitt et al., 2002) argue strongly against protracted preeruptive magma storage.

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