2. Open-system complex behavior Ar ... - University of Arizona
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2. Open-system complex behavior Ar can move around in samples prior to to analysis If this happens via thermally-activated volume diffusion, we can make sense of it.
Transcript of 2. Open-system complex behavior Ar ... - University of Arizona
2. Open-system complex behavior
Ar can move around in samples prior to to analysis
If this happens via thermally-activated volume diffusion, we can make sense of it.
If this is "true," we should be able to take the t-T history and predict the evolution of 40Ar* concentration within the single domain that is the K-spar, then use that to predict what the 40Ar/39Ar step heating spectrum should look like...
New Ar Arrhenius plot for MH-10.
Normalized age spectrum example.
τ = time required to diminish D by a factor of e.
ρ = characteristic size of diffusion domains
A = geometry factor
Parsons et al., 1999
Harrison & Lovera, 2014
typical assumptions are that domains have identical Ea, D0, and no interaction (e.g., are not nested)
typical nomenclature for domains:size = ρjvolume fraction = φj
Cfg
Farley & McKeon, 2015
Farley & McKeon, 2015
Remember that, typically, monotonic cooling is assumed...
