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  1. University of Mandalay
  2. Department of Geology

Confined fission tracks in ion-irradiated and step-etched prismaticsections of Durango apatite

http://hdl.handle.net/20.500.12678/0000000708
http://hdl.handle.net/20.500.12678/0000000708
115d2134-f09c-40df-ba04-589420132e52
c4f464c3-53ff-43a5-81f1-3ed50cfa2b8a
Publication type
Journal article
Upload type
Publication
Title
Title Confined fission tracks in ion-irradiated and step-etched prismaticsections of Durango apatite
Language en
Publication date 2007
Authors
Myo Min
Jonckheerea, Raymond
Enkelmanna, Eva
Trautmann, Christina
Ratschbachera, Lothar
Description
Apatite fission-track analysis retraces the thermal histories of geological samples under ∼120 °C but low numbers of confined
tracks often lead to weak constraints on the modelling results. Ion irradiation and increasing etching time are effective means to
increase the number of etched confined tracks. Our results support a linear dependence of the number of intersected tracks on the
lengths and densities of both the ion and fission tracks. The effectiveness of ion irradiation also depends on the etched-track
geometries, i.e. on the beam orientation and etching conditions. Knife-blade shaped ion tracks parallel to the apatite c-axis are more
efficient than funnel-shaped tracks perpendicular to c but add to the angular bias in favour of high angles to c. The irradiation
conditions do not affect the mean track length at a given angle to c. The number of confined tracks increases in linear proportion to
etching time above a certain threshold, which we interpret as the time required to etch a track to measurable dimensions. Past this
threshold, the rate of confined track revelation is rapid. The high rate of increase is itself a direct consequence of the fact that
confined tracks are not measurable if etched for less than a certain minimum length of time. Etching time does not affect the
angular bias but it does increase the mean track lengths at all angles. The average rate of increase of the fossil track lengths exceeds
that of the induced tracks at the 2σ level. Under some conditions, ion irradiation leads to blocking of fission tracks and the
development of “semi-tracks”. The elliptical model of mean horizontal confined track length vs. angle to the c-axis in prismatic
apatite sections is over-constrained with respect to the known symmetries and does not provide the best possible fit to the dataset.
Some observations suggest a fundamental difference between fossil and induced tracks.
Keywords
Fission-track modelling
Identifier https://doi.org/10.1016/j.chemgeo.2007.03.015
Journal articles
Chemical Geology
242
Conference papaers
Books/reports/chapters
Thesis/dissertations
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