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Single-track length measurements of step-etched fission tracks in Durango apatite: “Vorsprung durch Technik”

  • Raymond Jonckheere EMAIL logo , Murat T. Tamer , Bastian Wauschkuhn , Florentine Wauschkuhn and Lothar Ratschbacher
Published/Copyright: May 6, 2017
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American Mineralogist
From the journal American Mineralogist Volume 102 Issue 5

Abstract

Fossil and induced confined fission-tracks in the Durango apatite do not etch to their full etchable lengths with the current protocols. Their mean lengths continue to increase at a diminished rate past the break in slope in a length vs. etch-time plot. The mean length of the fossil tracks increases from 14.5(1) to 16.2(1) μm and that of the induced tracks from 15.7(1) to 17.9(1) μm between 20 and 60 s etching (5.5 M HNO3; 21 °C); both are projected to converge toward ~18 μm after ~180 s. This increase is due to track etching, not bulk etching. The irregular length increments of individual tracks reveal a discontinuous track structure in the investigated length intervals. The mean lengths of the fossil and induced tracks for the standard etch time (20 s) for the (5.5 M HNO3; 21 °C) etch are thus not the result of a shortening of the latent fission tracks but instead of a lowering of the effective track-etch rate νT. The rate of length increase of individual fossil confined tracks correlates with their length: older tracks are shorter because they etch slower. Step etching thus makes it possible to some extent to distinguish between older and younger fossil fission tracks. Along-track νT measurements could reveal further useful paleo-temperature information. Because the etched length of a track at standard etch conditions is not its full etchable length, geometrical statistics based on continuous line segments of fixed length are less secure than hitherto held.

Keywords: Durango apatite; fission track; step etching; confined-track length

Special collection papers can be found online at http://www.minsocam.org/MSA/AmMin/special-collections.html.

Acknowledgments

Work supported by the German Research Foundation (DFG grants JO 358/3 and RA 442/27). We are obligated to B. Van Houdt (BR-1 reactor; SCK·CEN Mol, Belgium) for the thermal-neutron irradiation, and to P. Van den haute (Ghent University, Belgium) for discussion of the manuscript. We are indebted to E. Sobel (University of Potsdam) and an unnamed referee for their insightful comments.

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Received: 2016-10-18
Accepted: 2016-12-28
Published Online: 2017-5-6
Published in Print: 2017-5-24

© 2017 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2017-5988
Keywords for this article
Durango apatite; fission track; step etching; confined-track length

Articles in the same Issue

  1. Highlights and Breakthroughs
  2. Defining minerals in the age of humans
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  4. Bottled samples of Earth’s lower mantle
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  8. Diamonds from the lower mantle?
  9. Review
  10. A review and update of mantle thermobarometry for primitive arc magmas
  11. Special collection: New advances in subduction zone magma genesis
  12. Using mineral geochemistry to decipher slab, mantle, and crustal input in the generation of high-Mg andesites and basaltic andesites from the northern Cascade Arc
  13. Special collection: From magmas to ore deposits
  14. Sperrylite saturation in magmatic sulfide melts: Implications for formation of PGE-bearing arsenides and sulfarsenides
  15. Special collection: Water in nominally hydrous and anhydrous minerals
  16. Water transport by subduction: Clues from garnet of Erzgebirge UHP eclogite
  17. Special collection: Apatite: A common mineral, uncommonly versatile
  18. Single-track length measurements of step-etched fission tracks in Durango apatite: “Vorsprung durch Technik”
  20. Transformation of halloysite and kaolinite into beidellite under hydrothermal condition
  22. Controls on trace-element partitioning among co-crystallizing minerals: Evidence from the Panzhihua layered intrusion, SW China
  24. Using mineral equilibria to estimate H2O activities in peridotites from the Western Gneiss Region of Norway
  26. Rowleyite, [Na(NH4,K)9Cl4][ V25+,4+(P,As)O8]6⋅n[H2O,Na,NH4,K,Cl], a new mineral with a microporous framework structure
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  32. Dry annealing of metamict zircon: A differential scanning calorimetry study
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