The KTB apatite fission-track profiles: Building on a firm foundation?

Wauschkuhn, Bastian; Jonckheere, Raymond; Ratschbacher, Lothar

doi:10.1016/j.gca.2015.06.015

Cited by 29 publications

(24 citation statements)

References 152 publications

(317 reference statements)

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“…This meant that these problems remained unresolved but supported countless geological applications. The fact that the fission-track ages of the age standards need no correction for partial annealing explains that the ϕ-and ζ-ages of geological samples are consistent within error (De Grave and Van den haute, 2002;Enkelmann et al, 2005bEnkelmann et al, , 2006Grimmer et al, 2002;Wauschkuhn et al, 2015a). It also lends meaning to ζ-ages, which must otherwise be interpreted as part-corrected ages (Green, 1985(Green, , 1988, with an uncertain relationship to the apatite closure temperature.…”

Section: Discussionmentioning

confidence: 99%

“…(7) and (8) (Table 1) for calculating the length-corrected ages. For approximate isothermal holding, this estimate is almost independent of the annealing model and the length-bias model (ρ/ρ 0 vs. l/l 0 ) (Wauschkuhn et al, 2015a). The length-corrected ages, including the corrections for methodological factors, are listed in Table 5.…”

Section: Length-corrected Agementioning

confidence: 98%

“…10% shorter than the induced tracks Green, 1988;Green et al, 1986). The length-correction factor is thus given by: L ≈ l I /l S , although its exact value would be slightly higher due to the broadening of the fossil-track-length distribution, and somewhat dependent on the annealing equations and (T,t)-history (Wauschkuhn et al, 2015a).…”

Section: Adjusted Age Equationmentioning

confidence: 99%

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Standardless fission-track dating of the Durango apatite age standard

2015

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Five dating strategies were used for determining the standardless fission-track age of the Durango apatite. These use the same fossil-track densities but differ in the manner in which the induced-track densities are determined. A conventional age calculation, without correction for experimental factors, gives inconsistent ages with methodrelated differences N 15%. Correcting for these factors brings the ages in line with each other and with the reference age but leaves no room for a partial-annealing correction based on the confined-track lengths. Three further reasons suggest that a length correction is not appropriate. (1) The evidence for lengthbased corrections is inconclusive. (2) The plateau age of the Durango apatite is consistent with its apparent fission-track age to within 1%. (3) The calculated effective etchable length of the fossil tracks agrees within error with that of the induced tracks; both are further consistent with the measured mean length of confined induced tracks. The circumstance that the (U,Th)/He ages of the accepted and proposed apatite age standards are consistent with their reference ages leaves no margin for a lowered fission-track age resulting from partial annealing, although the case of the Durango apatite itself is inconclusive because of its exceptional crystal size. It is conjectured that the shortening of the fossil tacks in the Durango apatite is due to a lowering of the track etch rate over time. In this case, annealing equations fitted to induced-track data underestimate the extent of confined-track-length reduction in geological samples.

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Section: Discussionmentioning

confidence: 99%

Section: Length-corrected Agementioning

confidence: 98%

Section: Adjusted Age Equationmentioning

confidence: 99%

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Standardless fission-track dating of the Durango apatite age standard

2015

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“…The samples were processed for apatite and zircon. AFT ages and track lengths were determined following standard procedures in the Freiberg Track Laboratory, described in Wauschkuhn et al (2015) and Käßner et al (2016); Text S2 provides a summary. In essence, we liberated the grains by high‐voltage‐discharge rock fragmentation, etched the apatite mounts in 5.5 M HNO 3 at 21 °C for 20 s, and determined ages with the external detector method and the ζ calibration, using the Durango‐apatite and IRMM‐450R uranium‐glass standards.…”

Section: Samples and Methodsmentioning

confidence: 99%

Tajik Basin and Southwestern Tian Shan, Northwestern India‐Asia Collision Zone: 2. Timing of Basin Inversion, Tian Shan Mountain Building, and Relation to Pamir‐Plateau Advance and Deep India‐Asia Indentation

et al. 2020

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“…Further complications could arise depending on the repair processes involved in geological and lab annealing of fission tracks in apatite, and their effects on etching. Sub-threshold etching could offer an explanation for the unresolved difference between the length-density relationships for geological annealing of fossil fission tracks [6,[43][44][45] and for lab annealing of induced fission tracks [1,35,46].…”

Section: Discussionmentioning

confidence: 99%