The PFA sheet: An improved mounting material for fission track analysisof zircon

Danhara, Tohru; Iwano, Hideki; Kasuya, Masao; Yamashita, Tsugito

doi:10.1016/1359-0189(93)90174-8

Cited by 19 publications

(8 citation statements)

References 6 publications

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“…Zircon grains from each sample were mounted in a PFA Teflon sheet (Danhara et al . ) with their external crystal surfaces exposed. The zircon mounts were irradiated with a thermal neutron fluence of 4.2–4.6 × 10 14 cm −2 .…”

Section: Dating Of Zircon Standardsmentioning

confidence: 99%

A review of the present state of the absolute calibration for zircon fission track geochronometry using the external detector method

Danhara¹,

Iwano²

2013

Island Arc

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The authors have developed and demonstrated an independent calibration of zircon fission track dating with the external detector method. During the past two decades, investigations have continued concerning the issues of the absolute age calibration of fission track dating. The derivation of accurate fission track age equations has been made possible by taking into account the relationships between the latent and etched track lengths. Our dating exercise involving 10 zircon reference samples supports our claim that absolute age determinations can be carried out based on the following three parameters:(1) the 238 U spontaneous fission decay constant of 8.5 ¥ 10 -17 a -1 (l f ) which is recommended by the IUPAC; (2) thermal neutron fluence values based on pre-irradiated IRMM540 dosimeter glass, which is equivalent to the Au and Co metal activation monitors in the 1990 IUGS recommendation; and (3) a [GQR] correction value of 1.35 which has been experimentally determined for the combination of zircon external surfaces irradiated with mica external detectors. Independent measurements of uranium concentration by the fission track method were also tested. A new method of fission track dating that uses mass spectrometry for uranium measurements was simulated with success using our zircon data. We propose that the Fission Track Community reassesses the situation and formulates a new recommendation, in which the established independent method is placed on at least an equal footing with the standard-based method.

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Section: Dating Of Zircon Standardsmentioning

confidence: 99%

A review of the present state of the absolute calibration for zircon fission track geochronometry using the external detector method

Danhara¹,

Iwano²

2013

Island Arc

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“…Zircon crystal were mounted in FEP Teflon and later in PFA Teflon (Danhara et al, 1993) and etched at 200ºC in NaOH-KOH-LiOH eutectic melt (Zaun and Wagner, 1985). Sphene and apatite crystals were mounted in epoxy resin.…”

Section: Analytical Proceduresmentioning

confidence: 99%

Cretaceous to Cenozoic thermal evolution of the southwestern South Carpathians: evidence from fission-track thermochronology

1998

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“…Thus, the grains were pressed onto a tetrafluoroethylene‐perfluoroalkoxyethylene (PFA) film by heating the sheet at 332 °C (Danhara et al . 1993). The mounting procedure onto PFA film or adhesive tape allows presentation of the natural surfaces of grains so that their outermost parts could be directly analysed (Danhara et al .…”

Section: Methodsmentioning

confidence: 99%

Depth‐Profiling Determinations of Rare Earth Element Abundances and U‐Pb Ages from Zircon Crystals Using Sensitivity‐Enhanced Inductively Coupled Plasma‐Time of Flight‐Mass Spectrometry

Nakazato

Asanuma

Niki

et al. 2022

Geostandard Geoanalytic Res

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Depth‐profiling measurements of both the abundances of rare earth elements (REEs) and U‐Pb ages from zircons were conducted using a time‐of‐flight based inductively coupled plasma‐mass spectrometer (ICP‐ToF‐MS) coupled with laser ablation sampling. To improve ion transmission, a dry plasma cone from Nu Instruments was applied to the ICP‐ToF‐MS system employed. The signal‐to‐noise ratios for the analytes were further improved using a multiple spot‐laser ablation (msLA) protocol. Moreover, constructing a ‘moat’ around an analysis area obviated the risk of mixing of particles released from different layers. With the technique developed here, reproducible analyses of REE abundances and U‐Pb ages for three reference material zircons (91500, Plešovice and OD‐3) were performed for sampling depths in the range 0.59–0.66 μm. The present technique was also applied to zircon samples collected from the Himalayan orogen. The combination of REE abundances and U‐Pb isotopic ratios suggested that the discordant trend in U‐Pb isotopic ratios observed in this study was mainly due to mixing among three components in grains (thin outer layer, inner rim and core). The geochemical data obtained demonstrate that the combination of the msLA technique and ICP‐ToF‐MS system is a powerful tool to decode the multiple thermal events contributing to sample formation.

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The PFA sheet: An improved mounting material for fission track analysisof zircon

Cited by 19 publications

References 6 publications

A review of the present state of the absolute calibration for zircon fission track geochronometry using the external detector method

A review of the present state of the absolute calibration for zircon fission track geochronometry using the external detector method

Cretaceous to Cenozoic thermal evolution of the southwestern South Carpathians: evidence from fission-track thermochronology

Depth‐Profiling Determinations of Rare Earth Element Abundances and U‐Pb Ages from Zircon Crystals Using Sensitivity‐Enhanced Inductively Coupled Plasma‐Time of Flight‐Mass Spectrometry

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