Abstract
We measured the apatite etch rate vR in 5.5 M HNO3 at 21 °C as a function of orientation. Results for Durango apatite evidence that vR varies by a factor >5 with angle to the c-axis. Our measurements also provided track etch rates vT and surface etch rates vS. However, these cannot be combined for calculating track etching or counting efficiencies. By inserting the measured etch rates in a recent model, we calculate the geometries and dimensions of surface tracks in different apatite faces. The proposed model must be recalibrated for different etching protocols and adapted for other minerals. We submit that the new model justifies reviewing track counting efficiencies based on the existing (vB-vT) etch model. We anticipate that this will have an effect on practical aspects of fission track dating. Single-track step-etch data show that the confined track lengths increase with etch time at a decreasing average rate vL that differs from the track etch rate vT and the apatite etch rate vR. Both vT and vL exhibit large track-to-track differences that produce irreducible length variation related to the latent-track structure resulting from formation and annealing. Step etching and track width measurements are effective for reducing or eliminating procedure-related artifacts from track length data, and so for accessing more fundamental track properties.
Acknowledgments and funding
Research funded by the German Research Council (DFG project Jo 358/4-1). We are much indebted to R. Ketcham and A.J.W. Gleadow for their professional reviews, which greatly improved our manuscript.
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- Gamma-enhancement of reflected light images: A rapid, effective tool for assessment of compositional heterogeneity in pyrite
- Thermal metamorphic history of Antarctic CV3 and CO3 chondrites inferred from the first- and second-order Raman peaks of polyaromatic organic carbon
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- Water quantification in olivine and wadsleyite by Raman spectroscopy and study of errors and uncertainties
- High-pressure and high-temperature vibrational properties and anharmonicity of carbonate minerals up to 6 GPa and 500 °C by Raman spectroscopy
- Vanadium-induced coloration in grossite (CaAl4O7) and hibonite (CaAl12O19)
- Incorporation mechanism of tungsten in W-Fe-Cr-V-bearing rutile
- Titanium diffusion profiles and melt inclusion chemistry and morphology in quartz from the Tshirege Member of the Bandelier Tuf
- Vasilseverginite, Cu9O4(AsO4)2(SO4)2, a new fumarolic mineral with a hybrid structure containing novel anion-centered tetrahedral structural units
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- Stöfflerite, (Ca,Na)(Si,Al)4O8 in the hollandite structure: A new high-pressure polymorph of anorthite from martian meteorite NWA 856
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