气候变化领域集成服务门户(CCPortal): Surface paleothermometry using low-Temperature thermoluminescence of feldspar

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DOI	10.5194/cp-16-2075-2020
	Surface paleothermometry using low-Temperature thermoluminescence of feldspar
	Biswas R.H.; Herman F.; King G.E.; Lehmann B.; Singhvi A.K.
发表日期	2020
ISSN	18149324
起始页码	2075
结束页码	2093
卷号	16 期号:6
英文摘要	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 18O 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. © 2020 BMJ Publishing Group. All rights reserved.
语种	英语
scopus关键词	Bayesian analysis; bootstrapping; climate variation; distribution system; electron; feldspar; high temperature; low temperature; oxygen isotope; paleotemperature; surface temperature; thermoluminescence; Alps; Auvergne-Rhone-Alpes; France; Haute Savoie; Mer de Glace; Mont Blanc; Savoy Alps; Western Alps
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146652
作者单位	Institute of Earth Surface Dynamics, University of Lausanne, Lausanne, Switzerland; Atomic Molecular and Optical Physics, Physical Research Laboratory, Ahmedabad, India
推荐引用方式 GB/T 7714	Biswas R.H.,Herman F.,King G.E.,et al. Surface paleothermometry using low-Temperature thermoluminescence of feldspar[J],2020,16(6).
APA	Biswas R.H.,Herman F.,King G.E.,Lehmann B.,&Singhvi A.K..(2020).Surface paleothermometry using low-Temperature thermoluminescence of feldspar.Climate of the Past,16(6).
MLA	Biswas R.H.,et al."Surface paleothermometry using low-Temperature thermoluminescence of feldspar".Climate of the Past 16.6(2020).