Fully-automated counting for fission track dating and thermochronology

Gleadow, Andrew; Gleadow, S.J.; Belton, David; Kohn, Barry P.; Krochmal, M.S.; Brown, R. W.

doi:10.1016/j.gca.2006.06.413

Cited by 8 publications

(11 citation statements)

References 1 publication

(1 reference statement)

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“…The implanted tracks were oriented at approximately 30° to the surface and the mount was step‐etched in 15‐min increments. Imagery of each monazite grain was captured in transmitted and reflected light using a 100x dry objective on a Zeiss Axio Imager M1 m motorised microscope fitted with a PI piezo‐motor scanning stage and a 4 Megapixel IDS μEye USB 3 CMOS digital camera, interfaced to a control PC using TrackWorks software (Gleadow, Gleadow, Frei, Kohlmann, & Kohn, ). Each etching step was followed by image capture on the same grains and this was repeated until the tracks were over‐etched, after a total of 90 min.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Etching of fission tracks in monazite: An experimental study

et al. 2019

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This study reports a range of etching and annealing experiments to establish the optimum conditions for the etching of fission tracks in monazite. The previously reported concentrated (12 M) HCl etchant at 90°C was found to cause grain loss from epoxy mounts and high degrees of grain corrosion, as did much longer etching times at lower temperatures. Using implanted 252Cf semi‐tracks, a series of experiments were performed on internal prismatic faces of monazite‐(Ce) crystals from the Palaeozoic Harcourt Granodiorite (Victoria, Australia) using an alternative 6 M HCl etchant, also at 90°C. Step‐etch results show optimal etching at 60–90 min. Further, an isothermal annealing experiment illustrated that the degree of annealing that can be expected during etching at 90°C under laboratory time scales is negligible. The etching rate between grains is not uniform, with a correlation demonstrated between over‐etched grains and high U and Th concentrations.

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Section: Experiments and Resultsmentioning

confidence: 99%

Etching of fission tracks in monazite: An experimental study

et al. 2019

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“…At the UoM laboratory, track length measurements were carried out as refraction and dip-corrected 3D lengths using an automated image acquisition and processing system developed in house, which consists of a motorized Zeiss Axio-Imager M1m microscope controlled by the TrackWorks software package (Gleadow et al 2009a(Gleadow et al , 2009b Gleadow and Seiler 2015). The microscope is fitted with a motorized stage system with vertical movements in 25 nm steps.…”

Section: Length Measurements Using Conventional Wide Field Microscopymentioning

confidence: 99%

“…Archived fission track image sets were later retrieved and analyzed on a computer using the fission track image analysis and measurement software FastTracks (Gleadow et al 2009b; 2015; Gleadow and Seiler 2015). Track lengths were measured by focusing through the digital image stacks on the monitor and clicking at each end of the confined track with the cursor at a total effective magnification of ~6,000x -10,000x.…”

Section: Length Measurements Using Conventional Wide Field Microscopymentioning

confidence: 99%

Observations on three-dimensional measurement of confined fission track lengths in apatite using digital imagery

Gleadow

Seiler

et al. 2018

American Mineralogist

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We report the results of a comparative study to explore the usefulness of 3D measurements of confined fission track lengths (TINTs) relative to horizontal confined track length measurements (dips ≤10°), and evaluate their suitability for thermal history modelling. Confined fission track lengths were measured in ten annealed Fish Canyon Tuff apatites containing synthetic mixtures of different length components, and two Durango apatites containing spontaneous fission tracks. Measurements were primarily carried out using a digital image-based microscope system, and compared to those from a regular optical drawing tube-digitizing tablet setup and a confocal laser scanning microscope. The results indicate that 3D measurements of confined track lengths are closely comparable to / 38 conventional horizontal track measurements, and the mean track lengths of inclined (dips >10°) and horizontal (dips ≤10°) confined tracks from the one sample are equivalent within the measurement uncertainty. A strong dip-bias was observed, so that almost all the confined tracks measured were dipping at <30°, and the great majority (~70%) were dipping at ≤10°, thereby qualifying as 'horizontal' confined tracks. Our results suggest that a useful increase of more than 40% in sample size can be achieved from including dip-and refraction-corrected 3D track length measurements. Some evidence was seen for a small bias in favor of shorter tracks at higher dip angles but this has very little influence on the mean lengths or length distributions up to the practical limit of dips (~30°) observed in these measurements. Results obtained using the same measurement system by a single analyst over time, and between six different observers in the one laboratory, show good reproducibility. These results also agree well with conventional horizontal confined track length measurements in the same samples in the second laboratory involved. We conclude that 3D measurements of confined track lengths, including both horizontal and inclined tracks, are suitable for use in current fission track annealing models derived from experiments using horizontal confined tracks.

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“…The technique can reconstruct the geologic history of the upper crust as long as million yeas within the extension of 3−5 km (Kohn and Green, 2002). With the advancement of the Zeta calibration method and the application of the standard ages from Durango (Hurford and Green, 1983), since the 1980s, the AFT thermochronological studies have been gradually deepened and mainly focused on the single grains of clastic sediment for fission track dating (Brandon, 1996), the mechanisms and kinetics of apatite fission track annealing (Carlson, 1990), the automated counting for fission track dating (Gleadow et al, 2006), etc. Therefore, AFT thermochronology was rapidly developed based on those studies and widely applied in the reconstruction of the tectonic uplift history (Holford et al, 2005;Green et al, 2005;Grist and Zentilli, 2003;Shen Chuanbo et al, 2006b;Li Xiaoming and Song Yougui, 2006), which is the base of basin analysis and particularly important for estimating the formation time of trap and hydrocarbon accumulation.…”

Section: Introductionmentioning

confidence: 99%

Tectonic uplift history of the Yitong Basin since the Oligocene, Northeast China: Evidence from apatite fission track ages and geological relationship

Cao

Shen

et al. 2010

Chin. J. Geochem.

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The Yitong Basin is an oil-bearing basin with unique characteristics in Northeast China. On the basis of apatite fission track ages and geological relationship, the tectonic uplift history of the Yitong Basin since the Oligocene was discussed. Based on apatite fission track analysis of five samples from the Luxiang and Chaluhe fault depressions and basin modeling study, it can be concluded that since the Oligocene (36.6 Ma) in the Yitong Basin, the Chaluhe fault depression has undergone two episodes of uplift during 24.9-19.1 Ma and 6.9-4.9 Ma. And the Luxiang fault depression also had undergone two episodes of uplift during 30-27.8 Ma and 22.6-11.1 Ma. Moreover, the average apparent exhumation rates for the Chaluhe fault depression and Luxiang fault depression, could be calculated to be 70.34 and 60.33 m/Ma since 21.8 Ma and 18.9 Ma, respectively. The results of thermochronological analysis can also be supported by the evidence from geological relationships such as geodynamics, volcanic activity, and stratigraphic division and correlation.

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Fully-automated counting for fission track dating and thermochronology

Cited by 8 publications

References 1 publication

Etching of fission tracks in monazite: An experimental study

Etching of fission tracks in monazite: An experimental study

Observations on three-dimensional measurement of confined fission track lengths in apatite using digital imagery

Tectonic uplift history of the Yitong Basin since the Oligocene, Northeast China: Evidence from apatite fission track ages and geological relationship

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