Actinides in Geology, Energy, and the Environment. Further investigation of the initial fission-track length and geometry factor in apatite fission-track thermochronology
-
Cleber J. Soares
,
Sandro Guedes
Abstract
The external detector method (EDM) is a widely used technique in fission track thermochronology (FTT) in which two different minerals are concomitantly employed: spontaneous tracks are observed in apatite and induced ones in the muscovite external detector. They show intrinsic differences in detection and etching properties that should be taken into account. In this work, new geometry factor values, g, in apatite, were obtained by directly measuring the ρed/ρis ratios and independently determined [GQR]ed/is values through the measurement of projected lengths. Five mounts, two of which were large area prismatic sections and three samples composed of random-orientation pieces have been used to determine the g-values. A side effect of applying EDM is that the value of the initial confined induced fission track, L0, is not measured in routine analyses. The L0-value is an important parameter to quantify with good confidence the degree of annealing of the spontaneous fission tracks in unknown-age samples, and is essential for accurate thermal history modeling. The impact of using arbitrary L0-values on the inference of sample thermal history is investigated and discussed. The measurement of the L0-value for each sample to be dated using an extra irradiated apatite mount is proposed. This extra mount can be also used for determining the g value as an extension of the ρed/ρis ratio method. Eight apatite samples from crystalline basement, with grains at random orientation, were used to determine the g-values. The results found are statistically in agreement with the values found for apatite samples (from Durango, Mexico) measured in prismatic section and also measured at random orientation. There was no observable variation in efficiency regarding crystal orientation, showing that it is relatively safe using non-prismatic grains, especially in samples with paucity of grains, as it is the case of most basin samples. Implications for the ζ-calibration and for the calibration of the direct (spectrometer-based) fission-track dating are also discussed.
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Editorial. Why you should publish your best papers in American Mineralogist: An International Journal of Earth and Planetary Materials
- Highlights and Breakthroughs. New constraints on the size of chondrite parent bodies
- Actinides in Geology, Energy, and the Environment. Further investigation of the initial fission-track length and geometry factor in apatite fission-track thermochronology
- Versatile monazite: Resolving geological records and solving challenges in materials science. Carboniferous inherited grain and age zoning of monazite and xenotime from leucogranites in far-eastern Nepal: Constraints from electron probe microanalysis
- Versatile monazite: Resolving geological records and solving challenges in materials science. Diffusion of helium in natural monazite, and preliminary results on He diffusion in synthetic light rare earth phosphates
- Crystal structure of the high-pressure phase of calcium hydroxide, portlandite: In situ powder and single-crystal X-ray diffraction study
- Experimental development of patch perthite from synthetic cryptoperthite: Microstructural evolution and chemical re-equilibration
- Oxy-dravite, Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup
- Behavior of gold in a magma at sulfide-sulfate transition: Revisited
- A disordered nanoparticle model for 6-line ferrihydrite
- NanoSIMS Pb/Pb dating of tranquillityite in high-Ti lunar basalts: Implications for the chronology of high-Ti volcanism on the Moon
- Iron sulfide stoichiometry as a monitor of sulfur fugacity in gas-mixing experiments
- Relaxation effects and re-entrant spin glass behavior at low temperatures in natural strunzite, ferristrunzite, and ferrostrunzite
- Enthalpies of formation of Fe-Ni monosulfide solid solutions
- Influence of temperature and Cl on the hydrothermal replacement of calcite by apatite and the development of porous microstructures
- Ordering state in orthopyroxene as determined by precession electron diffraction
- Interlayer water molecules in organocation-exchanged vermiculite and montmorillonite: A case study of tetramethylammonium
- Spectroscopic and X-ray diffraction investigation of the behavior of hanksite and tychite at high pressures, and a model for the compressibility of sulfate minerals
- Low-temperature magnetism of alabandite: Crucial role of surface oxidation
- Crystallographic and spectroscopic characterization of Fe-bearing chromo-aluminopovondraite and its relations with oxy-chromium-dravite and oxy-dravite
- Experimental determination of siderite stability at high pressure
- Relationships among channel topology and atomic displacements in the structures of Pb5(BO4)3Cl with B = P (pyromorphite), V (vanadinite), and As (mimetite)
- The crystal structure of johnbaumite, Ca5(AsO4)3OH, the arsenate analogue of hydroxylapatite
- A comparison of the Ca3(PO4)2 and CaSiO3 systems, with a new structure refinement of tuite synthesized at 15 GPa and 1300 °C
- The system K2CO3-MgCO3 at 6 GPa and 900–1450 °C
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- Crystal chemistry of Cu-bearing tourmalines
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