ARGON RETENTION PROPERTIES OF SILICATE GLASSES AND IMPLICATIONS FOR 40AR/39AR AGE AND NOBLE GAS DIFFUSION STUDIES
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dc.contributor.author | Hazelton G.B. | |
dc.contributor.author | Axen G. | |
dc.contributor.author | Lovera O. | |
dc.date.accessioned | 2021-12-30T03:20:45Z | |
dc.date.available | 2021-12-30T03:20:45Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=5087249 | |
dc.identifier.citation | Contributions to Mineralogy and Petrology, 2003, 145, 1, 1-14 | |
dc.identifier.issn | 0010-7999 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/33944 | |
dc.description.abstract | Sized aggregates of glasses (47-84 wt% SiO2) were fused from igneous-derived cohesive fault rock and igneous rock, and step-heated from ~400 to >1,200 °C to obtain their 39Ar diffusion properties (average E=33,400 cal mol-1; Do=4.63×10-3 cm2 s-1). At T<~1,000 °C, glasses containing <~69 wt% SiO2 and abundant network-forming cations (Ca, Fe, Mg) reveal moderate to strong non-linear increases in D and E, reflecting structural modifications as the solid transitions to melt. Extrapolation of these Arrhenius properties down to typical geologic T-t conditions could result in a 1.5 log10 unit underestimation in the diffusion rate of Ar in similar materials. Numerical simulations based upon the diffusion results caution that some common geologic glasses will likely yield 40Ar/39Ar cooling ages rather than formation ages. However, if cooling rates are sufficiently high, ambient temperatures are sufficiently low (e.g., <65-175 °C), and coarse particles (e.g., radius (r)>~1 mm) are analyzed, glasses with compositions similar to ours may preserve their formation ages. | |
dc.title | ARGON RETENTION PROPERTIES OF SILICATE GLASSES AND IMPLICATIONS FOR 40AR/39AR AGE AND NOBLE GAS DIFFUSION STUDIES | |
dc.type | Статья |
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