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Title: Improved zircon fission-track annealing model based on reevaluation of annealing data

Abstract

The thermal recovery (annealing) of mineral structure modified by the passage of fission fragments has long been studied by the etching technique. In minerals like apatite and zircon, the annealing kinetics are fairly well constrained from the hour to the million-year timescale and have been described by empirical and semi-empirical equations. On the other hand, laboratory experiments, in which ion beams interact with minerals and synthetic ceramics, have shown that there is a threshold temperature beyond which thermal recovery impedes ion-induced amorphization. In this work, it is assumed that this behavior can be extended to the annealing of fission tracks in minerals. It is proposed that there is a threshold temperature, T0, beyond which fission tracks are erased within a time t0, which is independent of the current state of lattice deformation. This implies that iso-annealing curves should converge to a fanning point in the Arrhenius pseudo-space (ln t vs. 1/T). Based on the proposed hypothesis, and laboratory and geological data, annealing equations are reevaluated. The geological timescale estimations of a model arising from this study are discussed through the calculation of partial annealing zone and closure temperature, and comparison with geological sample constraints found in literature. It is shownmore » that the predictions given by this model are closer to field data on closure temperature and partial annealing zone than predictions given by previous models.« less

Authors:
 [1];  [2];  [3];  [1]
  1. Instituto de Fisica Gleb Wataghin, Unicamp, Brazil
  2. Pacific Northwest National Laboratory (PNNL)
  3. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1061561
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Physics and Chemistry of Minerals
Additional Journal Information:
Journal Volume: 40; Journal Issue: 2; Journal ID: ISSN 0342--1791
Country of Publication:
United States
Language:
English
Subject:
Fission tracks; zircon; annealing

Citation Formats

Guedes, Sandro, Moreira, Pedro A.F.P., Devanathan, Ram, Weber, William J, and Hadler, Julio C. Improved zircon fission-track annealing model based on reevaluation of annealing data. United States: N. p., 2013. Web. doi:10.1007/s00269-012-0550-8.
Guedes, Sandro, Moreira, Pedro A.F.P., Devanathan, Ram, Weber, William J, & Hadler, Julio C. Improved zircon fission-track annealing model based on reevaluation of annealing data. United States. https://doi.org/10.1007/s00269-012-0550-8
Guedes, Sandro, Moreira, Pedro A.F.P., Devanathan, Ram, Weber, William J, and Hadler, Julio C. 2013. "Improved zircon fission-track annealing model based on reevaluation of annealing data". United States. https://doi.org/10.1007/s00269-012-0550-8.
@article{osti_1061561,
title = {Improved zircon fission-track annealing model based on reevaluation of annealing data},
author = {Guedes, Sandro and Moreira, Pedro A.F.P. and Devanathan, Ram and Weber, William J and Hadler, Julio C},
abstractNote = {The thermal recovery (annealing) of mineral structure modified by the passage of fission fragments has long been studied by the etching technique. In minerals like apatite and zircon, the annealing kinetics are fairly well constrained from the hour to the million-year timescale and have been described by empirical and semi-empirical equations. On the other hand, laboratory experiments, in which ion beams interact with minerals and synthetic ceramics, have shown that there is a threshold temperature beyond which thermal recovery impedes ion-induced amorphization. In this work, it is assumed that this behavior can be extended to the annealing of fission tracks in minerals. It is proposed that there is a threshold temperature, T0, beyond which fission tracks are erased within a time t0, which is independent of the current state of lattice deformation. This implies that iso-annealing curves should converge to a fanning point in the Arrhenius pseudo-space (ln t vs. 1/T). Based on the proposed hypothesis, and laboratory and geological data, annealing equations are reevaluated. The geological timescale estimations of a model arising from this study are discussed through the calculation of partial annealing zone and closure temperature, and comparison with geological sample constraints found in literature. It is shown that the predictions given by this model are closer to field data on closure temperature and partial annealing zone than predictions given by previous models.},
doi = {10.1007/s00269-012-0550-8},
url = {https://www.osti.gov/biblio/1061561}, journal = {Physics and Chemistry of Minerals},
issn = {0342--1791},
number = 2,
volume = 40,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 2013},
month = {Tue Jan 01 00:00:00 EST 2013}
}