Physics
Scientific paper
Feb 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012e%26psl.319..178c&link_type=abstract
Earth and Planetary Science Letters, Volume 319, p. 178-184.
Physics
Scientific paper
We present new data for the age of the Mono Lake Excursion at its type locality. Using the (U-Th)/He system on allanite, we dated Wilson Creek Ash 15 (Lajoie, 1968) to 38.7 ± 1.2 ka (2 SE). The new age for this ash supports the hypothesis (Kent et al., 2002; Zimmerman et al., 2006) that the Mono Lake Excursion is coincident with, and probably the same event as, the Laschamp Geomagnetic Excursion (40.4 ± 2 ka), an event that shares similar magnetic characteristics with the excursion identified at Mono Lake. We also estimate an allanite magma residence time of slightly less than 30 ka based on 230Th/238U disequilibrium and the (U-Th)/He-based eruption age.
Cox Stephen E.
Farley Kenneth A.
Hemming Sidney R.
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