Helium diffusion in natural zircon: radiation damage, anisotropy, and the interpretation of zircon (U-TH)/He thermochronology
Citations
1,320 citations
Cites background from "Helium diffusion in natural zircon:..."
..., 2015), radiation damage (Flowers et al., 2009; Guenthner et al., 2013), and breakage during mineral separation (Brown et al....
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Cites background from "Helium diffusion in natural zircon:..."
...damage [Reiners et al., 2004; Shuster et al., 2006; Flowers et al., 2007; 2009; Guenthner et al., 2013], or for AHe, the number of intact crystal terminations [Brown et al....
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...147 damage [Reiners et al., 2004; Shuster et al., 2006; Flowers et al., 2007; 2009; Guenthner et al., 2013], or for AHe, the number of intact crystal terminations [Brown et al., 2013] (see supporting information for relevant parameters)....
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108 citations
Cites background or methods from "Helium diffusion in natural zircon:..."
...Plausible explanations for this included heterogeneous distribution of parent nuclides and fragmentation of crystals (both complicating routine a-ejection correction) (11, 21, 29–33), radiation damage affectingHe retentivity and closure temperature (10, 34), and inclusions containing “excess” He (11, 35, 36)....
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...(10) corresponding to the thermal trajectories from (B) (color-coded)....
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...Intracrystal heterogeneity of radiation damage Intracrystal variation in the degree of radiationdamage can result in both positive and negative correlations between eU concentration and He retention (10, 40)....
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...This example allows a visual comparison between domains of zircon crystal damage and He abundance, reflecting differential He retentivity as a result of the metamictization process (10, 34)....
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...(10) was opted tomodelHe diffusion in zircon....
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References
5,195 citations
"Helium diffusion in natural zircon:..." refers background in this paper
...This is analogous to diffusion in a porous medium where effective diffusivity is expressed as (Cussler, 1984): De Dz ....
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1,107 citations
"Helium diffusion in natural zircon:..." refers methods in this paper
...For each zoned zircon, we model the uncorrected date, the FTZ corrected date using the “redistribution” option in HeFTy, and the FTH corrected date....
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...However, we discuss below the results from several HeFTy models to show how zonation affects differential damage accumulation within a zircon and sample date-eU correlations....
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...This issue can be dealt with by using a zoned alpha ejection correction (FTZ) that accounts for alpha particle redistribution, which is an option in HeFTy....
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...With an estimate of the diffusion coefficient from equation (8), we then solve the diffusion equation numerically for a spherical geometry with the Crank-Nicholson finite difference scheme used in the thermal modeling software package HeFTy (Ketcham, 2005)....
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1,096 citations
954 citations
"Helium diffusion in natural zircon:..." refers background in this paper
...…or ones similar to it, has been observed previously in zircon (Reiners and others, 2002; Reiners and others, 2004) and several other minerals, including titanite (Reiners and Farley, 1999), goethite (Shuster and others, 2005), magnetite (Blackburn and others, 2007), and apatite (Farley, 2000)....
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...These traps sequester He (governed by an equilibrium partition coefficient) and prevent or slow its diffusive migration out of the crystal (Farley, 2000)....
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755 citations