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Quantitative Identification of the Annealing Degree of Apatite Fission Tracks Using Terahertz Time Domain Spectroscopy (THz-TDS)
- Source :
- Applied spectroscopy. 72(6)
- Publication Year :
- 2018
-
Abstract
- Apatite fission-track (AFT) analysis, a widely used low-temperature thermochronology method, can provide details of the hydrocarbon generation history of source rocks for use in hydrocarbon exploration. The AFT method is based on the annealing behavior of fission tracks generated by 238U fission in apatite particles during geological history. Due to the cumbersome experimental steps and high expense, it is imperative to find an efficient and inexpensive technique to determinate the annealing degree of AFT. In this study, on the basis of the ellipsoid configuration of tracks, the track volume fraction model (TVFM) is established and the fission-track volume index is proposed. Furthermore, terahertz time domain spectroscopy (THz-TDS) is used for the first time to identify the variation of the AFT annealing degree of Durango apatite particles heated at 20, 275, 300, 325, 450, and 500 ℃ for 10 h. The THz absorbance of the sample increases with the degree of annealing. In addition, the THz absorption index is exponentially related to annealing temperature and can be used to characterize the fission-track volume index. Terahertz time domain spectroscopy can be an ancillary technique for AFT thermochronological research. More work is urgently needed to extrapolate experimental data to geological conditions.
- Subjects :
- Materials science
010504 meteorology & atmospheric sciences
Fission
Terahertz radiation
Annealing (metallurgy)
Mineralogy
010502 geochemistry & geophysics
01 natural sciences
Apatite
Terahertz spectroscopy and technology
Thermochronology
visual_art
visual_art.visual_art_medium
Emission spectrum
Terahertz time-domain spectroscopy
Instrumentation
Spectroscopy
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 19433530
- Volume :
- 72
- Issue :
- 6
- Database :
- OpenAIRE
- Journal :
- Applied spectroscopy
- Accession number :
- edsair.doi.dedup.....48a52c2aa5c2e61109ab705097323671