Track counting efficiency and unetchable track range in apatite

Iwano, Hideki; Kasuya, Masao; Danhara, Tohru; Tamashita, T.; Tagami, Takahiro

doi:10.1016/1359-0189(93)90191-b

Cited by 19 publications

(11 citation statements)

References 13 publications

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“…4a curves (1) and (2)). This is in conflict with all experiments using the common etchants [12,19,24,32] and with the fact that alpha-recoil tracks are registered in the cleavage planes of muscovite [33] and [34] and but not in apatite. It is improbable that this is due to a misalignment of the apatite and muscovite during the track counts, because the 1.4 lm offset between the apatite and muscovite profiles alone requires a displacement of >13 lm in the direction of the maximum thickness gradient, which is not reconcilable with the near track-to-track match.…”

Section: Discussioncontrasting

confidence: 79%

“…However, the obvious cause for the difference between the measured and calculated transmission profiles is that the experiment compares the etchable track lengths with the calculated ranges of unetched latent 132 Xe and 238 U ion tracks. In materials with high registration thresholds, the distance to the point where the track-forming particle comes to rest exceeds the length over which its track is etchable; this difference is called the range deficit [17][18][19] or length deficit [12,20]. The dashed line (Fig.…”

Section: Discussionmentioning

confidence: 98%

See 1 more Smart Citation

Xe- and U-tracks in apatite and muscovite near the etching threshold

Wauschkuhn¹,

Jonckheere²,

Ratschbacher³

2015

Nuclear Instruments and Methods in Physics Research Section B:

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Section: Discussioncontrasting

confidence: 79%

Section: Discussionmentioning

confidence: 98%

Xe- and U-tracks in apatite and muscovite near the etching threshold

Wauschkuhn¹,

Jonckheere²,

Ratschbacher³

2015

Nuclear Instruments and Methods in Physics Research Section B:

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“…In principle, a threshold of energy loss is considered to be the mechanism responsible for triggering the faster dissolution of a track core in comparison with the bulk material. However, the range deficits in apatite for external irradiations (this work; Green and Durrani 1977;Green et al 1986;Singh et al 1986;Iwano et al 1993;Alencar et al 2012) are higher than those observed for confined fission tracks Carlson et al 1999;Barbarand et al 2003b;Jonckheere 2003;Tello et al 2006), which is inconsistent with a single threshold mechanism. Recently, Li et al (2012) showed a good agreement between high-resolution measurements with electron microscopy and calculations in the electronic (inelastic) stopping power regime for the angular dispersion and width reduction of latent (non-etched) ion tracks.…”

Section: Etchlable Lengthcontrasting

confidence: 69%

On the influence of etch pits in the overall dissolution rate of apatite basal sections

et al. 2015

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“…The relatively few direct measurements of this efficiency factor range from 0.90-0.99 (e.g. Iwano et al, 1993;Jonckheere and Van den haute, 2002). Hasebe et al (2004) used a value of 1.0.…”

Section: Discussionmentioning

confidence: 99%

The Fish Canyon Tuff: A new look at an old low-temperature thermochronology standard

Gleadow

Harrison

Kohn

et al. 2015

Earth and Planetary Science Letters

147

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The Fish Canyon Tuff (FCT) has served as an important source for geochronology standards, particularly for fission track, K-Ar and ( 40 Ar/ 39 Ar) dating, even though efforts to establish precise ages for its constituent minerals have proved to be unexpectedly complex. To evaluate the suitability of FCT apatite as a standard for apatite (U-Th-Sm)/He (AHe) thermochronometry, and to test underlying assumptions about its suitability for apatite fission track (AFT) thermochronometry, we analysed samples from a series of sites throughout the vertical and lateral extent of the host ignimbrite sheet. Samples were collected from the relatively lithic-rich, classic sampling location in the lower part of the thick proximal ignimbrite and a ∼330 m vertical section of FCT immediately above it. Average weighted mean AHe ages from multiple analyses at five sites in this profile range from 20.8 ± 0.4 Ma from the classic site at the base, to an average of 28.4 ± 0.2 Ma (all ±1σ ) in the upper part of the section. The AHe age at the classic site is substantially reduced at 20.8 ± 0.4 Ma relative to a reference age for ignimbrite emplacement of 28.2 Ma. Corresponding zircon (U-Th)/He (ZHe) ages for these samples are all concordant at 28.3 ± 0.4 Ma. By contrast, apatite fission track (AFT) ages from the same vertical section are all concordant at 27.4 ± 0.7 Ma with the central age of 28.8 ± 0.8 Ma at the classic site, except for the uppermost sample (23.2 ± 1.7 Ma) for which clear evidence for local, probably fire, disturbance is seen in the track length distribution. The AHe data at the classic site thus provide evidence for substantial post-eruptive Early Miocene cooling of the tuff consistent with its position at the bottom of a deeply incised valley with ∼800 m of local relief and probably >1000 m of removed section above it. The AFT age of the classic sampling site, however, is indistinguishable from ignimbrite emplacement and thus continues to be a useful standard for AFT (but not for AHe) geochronology. Apatites from this site have the highest measured Cl concentrations (0.82 wt%) of any of the FCT apatites analysed, contributing to this suitability. AFT and AHe ages at three distal localities, some 35-45 km to the East of the classic site, where the thickness of the FCT is reduced to <100 m, all yielded concordant ages with a weighted mean of 28.5 ± 0.11 Ma with no evidence for post-emplacement thermal disturbance. One of the distal sites -a quarry in the upper part of the FCT -appears to be an ideal locality for a standard reference material that would be suitable for both AFT and AHe low-temperature thermochronometers. U-Pb ages for zircons and 40 Ar/ 39 Ar step heating age spectra for sanidine at this new distal site are essentially identical to those found at the classic site.

show abstract

Track counting efficiency and unetchable track range in apatite

Cited by 19 publications

References 13 publications

Xe- and U-tracks in apatite and muscovite near the etching threshold

Xe- and U-tracks in apatite and muscovite near the etching threshold

On the influence of etch pits in the overall dissolution rate of apatite basal sections

The Fish Canyon Tuff: A new look at an old low-temperature thermochronology standard

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