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• W2950089495 abstract "Hypogene and supergene alunite and jarosite grains in the 500–200, 200–100, 100–50, 50–10, and <10 µm sieve-size ranges were neutron-irradiated in vacuum-sealed Si-glass capsules to permit direct quantification of 39Ar displaced by recoil during irradiation. Coarsely crystalline hypogene alunite and jarosite samples break into single crystals or equant fragments of single crystals when sieve size is larger than 10 µm. Recoil losses from these samples is less than 0.5%, and only 0.1% for alunite and 0.19% for jarosite in the sieve-size fractions > 200 µm, the typical size used in single crystal 40Ar/39Ar geochronology. The < 10 µm sieve-size fraction is composed of crystal shards with large surface:volume ratios; these sample powders may undergo up to 2.44% (alunite) and 2.24% (jarosite) 39Ar recoil losses. Supergene alunite samples are composed of aggregates of 1–5 µm pseudo-cubic crystallites, and 39Ar recoil losses are ∼ 1.0 ± 0.2%, independently of the sieve-size fraction dated. Supergene jarosite, composed of aggregates of 1–30 µm hexagonal plates, undergoes < 2% 39Ar recoil loss in sieve-size samples > 10 µm. Single crystals and shards of jarosite crystals in sieve-size fractions smaller than 10 µm show the largest recoil losses at 4.22%. The large 39Ar recoil losses in sieve-size samples < 10 µm is irrelevant for geochronology since routine 40Ar/39Ar analysis does not target grains in that size range. SRIM and TRIM modeling shows that recoil range (mean displacement distance) is 0.16 µm in amorphous targets of both alunite [KAl3(SO4)2(OH)6] (ρ = 2.74 g/cm3) and jarosite [KFe3(SO4)2(OH)6] (ρ = 3.09 g/cm3) compositions, resulting in 39Ar-depleted rims of 0.114 µm in alunite and 0.116 µm in jarosite. Modeling results show that most of the 39Ar ions ejected by recoil from individual crystallites in supergene samples gets re-implanted in nearby crystallites, resulting in relatively low 39Ar losses. The experimental and modeling results confirm that 39Ar recoil loss is not an impediment in dating of hypogene and supergene alunites and jarosites to precision and accuracy comparable to that obtained for silicates commonly used in 40Ar/39Ar geochronology." @default.
• W2950089495 created "2019-06-27" @default.
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• W2950089495 date "2019-09-01" @default.
• W2950089495 modified "2023-09-27" @default.
• W2950089495 title "Quantifying 39Ar recoil in natural hypogene and supergene alunites and jarosites" @default.
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• W2950089495 doi "https://doi.org/10.1016/j.gca.2019.06.019" @default.
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