Surface paleothermometry using low-temperature thermoluminescence of feldspar
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Published:2020-11-04
Issue:6
Volume:16
Page:2075-2093
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ISSN:1814-9332
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Container-title:Climate of the Past
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language:en
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Short-container-title:Clim. Past
Author:
Biswas Rabiul H.ORCID, Herman Frédéric, King Georgina E., Lehmann Benjamin, Singhvi Ashok K.ORCID
Abstract
Abstract. Thermoluminescence (TL) of feldspar is investigated for its potential
to extract temperature histories experienced by rocks exposed at
Earth's surface. TL signals from feldspar observed in the laboratory
arise from the release of trapped electrons from a continuous
distribution of trapping energies that have a range of thermal
stabilities. The distribution of trapping energies, or thermal
stabilities, is such that the lifetime of trapped electrons at room
temperature ranges from less than a year to several billion
years. Shorter lifetimes are associated with low-temperature TL
signals, or peaks, and longer lifetimes are associated with high
temperature TL signals. Here we show that trapping energies associated
with shorter lifetimes, or lower-temperature TL signals (i.e. between
200 and 250 ∘C), are sensitive to temperature
fluctuations occurring at Earth's surface over geological timescales.
Furthermore, we show that it is possible to reconstruct past surface
temperature histories in terrestrial settings by exploiting the
continuous distribution of trapping energies. The potential of this
method is first tested through theoretical experiments, in which a
periodic temperature history is applied to a kinetic model that
encapsulates the kinetic characteristics of TL thermometry. We then
use a Bayesian approach to invert TL measurements into temperature
histories of rocks, assuming that past temperature variations follow
climate variations observed in the δ18O records. Finally,
we test the approach on two samples collected at the Mer de Glace
(Mont Blanc massif, European Alps) and find similar temperature
histories for both samples. Our results show that the TL of feldspar may
be used as a paleothermometer.
Publisher
Copernicus GmbH
Subject
Paleontology,Stratigraphy,Global and Planetary Change
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