Developing an internally consistent methodology for K-feldspar MAAD TL thermochronology

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1016/j.radmeas.2022.106751. This is version 2 of this Preprint.

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Authors

Nathan David Brown , Edward John Rhodes

Abstract

Luminescence thermochronology and thermometry can quantify recent changes in rock exhumation rates and rock surface temperatures, but these methods require accurate determination of several kinetic parameters. For K-feldspar thermoluminescence (TL) glow curves, which comprise overlapping signals of different thermal stability, it is challenging to develop measurements that capture these parameter values. Here, we present multiple-aliquot additive-dose (MAAD) TL dose response and fading measurements from bedrock-extracted K-feldspars. These measurements are compared with Monte Carlo simulations to identify best-fit values for recombination center density ($\rho$) and activation energy ($\Delta E$). This is done for each dataset separately, and then by combining dose-response and fading misfits to yield more precise $\rho$ and $\Delta E$ values consistent with both experiments. Finally, these values are used to estimate the characteristic dose ($D_0$) of samples. This approach produces kinetic parameter values consistent with comparable studies and results in expected fractional saturation differences between samples.

DOI

https://doi.org/10.31223/X5GP8P

Subjects

Geology

Keywords

Feldspar thermoluminescence, low-temperature thermochronology, Kinetic parameters

Dates

Published: 2021-12-06 09:49

Last Updated: 2022-04-11 19:10

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License

CC BY Attribution 4.0 International

Additional Metadata

Conflict of interest statement:
None

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