Estimation of radiation damage in titanites using Raman spectroscopy
International audience Recent studies have shown that a-damage in titanite influences He diffusivity and thus the closure temperature of the (U-Th)/He system in titanite. We compare different methods for measuring the alpha-dose in titanite by Raman spectroscopy. Raman spectra of randomly oriented t...
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ftccsdartic:oai:HAL:hal-02158764v1 2023-05-15T17:00:24+02:00 Estimation of radiation damage in titanites using Raman spectroscopy Heller, Beatrix Muriel LüNsdorf, Nils Keno Dunkl, István Molnar, Ferenc von Eynatten, Hilmar Univ Gottingen, Geosci Ctr, Sedimentol & Environm Geol, Goldschmidtstr 3, D-37077 Gottingen, Germany. Géosciences Paris Sud (GEOPS) Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) Univ Gottingen, Geosci Ctr, Sedimentol & Environm Geol, Goldschmidtstr 3, D-37077 Gottingen, Germany Geol Survey Finland, POB 96, FI-02151 Espoo, Finland 2019-06-01 https://hal.archives-ouvertes.fr/hal-02158764 https://doi.org/10.2138/am-2019-6681 en eng HAL CCSD Mineralogical Society of America info:eu-repo/semantics/altIdentifier/doi/10.2138/am-2019-6681 hal-02158764 https://hal.archives-ouvertes.fr/hal-02158764 doi:10.2138/am-2019-6681 ISSN: 0003-004X American Mineralogist https://hal.archives-ouvertes.fr/hal-02158764 American Mineralogist, Mineralogical Society of America, 2019, 104 (6), pp.857-868. ⟨10.2138/am-2019-6681⟩ [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2019 ftccsdartic https://doi.org/10.2138/am-2019-6681 2021-05-01T22:52:19Z International audience Recent studies have shown that a-damage in titanite influences He diffusivity and thus the closure temperature of the (U-Th)/He system in titanite. We compare different methods for measuring the alpha-dose in titanite by Raman spectroscopy. Raman spectra of randomly oriented titanite fragments from the Archean Karelian domain in eastern Finland along with some well-studied young titanites and U-Pb standard reference materials were analyzed and related to the concentration of alpha-emitting elements (U and Th) that generated damage in the respective grains. Automated curve-fitting was performed by the IFORS software and different curve-fitting protocols were tested and compared.The Raman bands at 424 and 465 cm(-1) show a good correlation of full-width at half maximum (FWHM) and position with the alpha-dose. However, these bands are not always present because titanite is highly anisotropic implying that Raman spectra are sensitive to orientation. The intensity-weighted mean FWHM (iw-FWHM) of all Raman bands of a spectrum proves to be the most robust measure of the alpha-dose. A simplified fitting approach considering 15 peaks is sufficient to describe the accumulated alpha-dose. For alpha-doses below 5 x 10(16)alpha/g the iw-FWHM is independent of alpha-dose and ranges from 25 to 50 cm-1. Above this value the iw-FWHM increases linearly with increasing alpha-dose up to 3 x 10(18)alpha/g. The linear correlation can be described as iw-FWHM[cm(-1)] approximate to 39(+/- 1.2)[cm(-1)] + 3.84(+0.61,-0.26) x 10(-17)[cm(-1)/(alpha/g)] x alpha-dose[alpha/g]. The approach provides a pre-selection method to optimize the range of alpha-doses of titanite crystals to be dated by (U-Th)/He thermochronology. Article in Journal/Newspaper karelia* karelian Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) American Mineralogist 104 6 857 868 |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
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[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Heller, Beatrix Muriel LüNsdorf, Nils Keno Dunkl, István Molnar, Ferenc von Eynatten, Hilmar Estimation of radiation damage in titanites using Raman spectroscopy |
topic_facet |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Recent studies have shown that a-damage in titanite influences He diffusivity and thus the closure temperature of the (U-Th)/He system in titanite. We compare different methods for measuring the alpha-dose in titanite by Raman spectroscopy. Raman spectra of randomly oriented titanite fragments from the Archean Karelian domain in eastern Finland along with some well-studied young titanites and U-Pb standard reference materials were analyzed and related to the concentration of alpha-emitting elements (U and Th) that generated damage in the respective grains. Automated curve-fitting was performed by the IFORS software and different curve-fitting protocols were tested and compared.The Raman bands at 424 and 465 cm(-1) show a good correlation of full-width at half maximum (FWHM) and position with the alpha-dose. However, these bands are not always present because titanite is highly anisotropic implying that Raman spectra are sensitive to orientation. The intensity-weighted mean FWHM (iw-FWHM) of all Raman bands of a spectrum proves to be the most robust measure of the alpha-dose. A simplified fitting approach considering 15 peaks is sufficient to describe the accumulated alpha-dose. For alpha-doses below 5 x 10(16)alpha/g the iw-FWHM is independent of alpha-dose and ranges from 25 to 50 cm-1. Above this value the iw-FWHM increases linearly with increasing alpha-dose up to 3 x 10(18)alpha/g. The linear correlation can be described as iw-FWHM[cm(-1)] approximate to 39(+/- 1.2)[cm(-1)] + 3.84(+0.61,-0.26) x 10(-17)[cm(-1)/(alpha/g)] x alpha-dose[alpha/g]. The approach provides a pre-selection method to optimize the range of alpha-doses of titanite crystals to be dated by (U-Th)/He thermochronology. |
author2 |
Univ Gottingen, Geosci Ctr, Sedimentol & Environm Geol, Goldschmidtstr 3, D-37077 Gottingen, Germany. Géosciences Paris Sud (GEOPS) Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) Univ Gottingen, Geosci Ctr, Sedimentol & Environm Geol, Goldschmidtstr 3, D-37077 Gottingen, Germany Geol Survey Finland, POB 96, FI-02151 Espoo, Finland |
format |
Article in Journal/Newspaper |
author |
Heller, Beatrix Muriel LüNsdorf, Nils Keno Dunkl, István Molnar, Ferenc von Eynatten, Hilmar |
author_facet |
Heller, Beatrix Muriel LüNsdorf, Nils Keno Dunkl, István Molnar, Ferenc von Eynatten, Hilmar |
author_sort |
Heller, Beatrix Muriel |
title |
Estimation of radiation damage in titanites using Raman spectroscopy |
title_short |
Estimation of radiation damage in titanites using Raman spectroscopy |
title_full |
Estimation of radiation damage in titanites using Raman spectroscopy |
title_fullStr |
Estimation of radiation damage in titanites using Raman spectroscopy |
title_full_unstemmed |
Estimation of radiation damage in titanites using Raman spectroscopy |
title_sort |
estimation of radiation damage in titanites using raman spectroscopy |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.archives-ouvertes.fr/hal-02158764 https://doi.org/10.2138/am-2019-6681 |
genre |
karelia* karelian |
genre_facet |
karelia* karelian |
op_source |
ISSN: 0003-004X American Mineralogist https://hal.archives-ouvertes.fr/hal-02158764 American Mineralogist, Mineralogical Society of America, 2019, 104 (6), pp.857-868. ⟨10.2138/am-2019-6681⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.2138/am-2019-6681 hal-02158764 https://hal.archives-ouvertes.fr/hal-02158764 doi:10.2138/am-2019-6681 |
op_doi |
https://doi.org/10.2138/am-2019-6681 |
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American Mineralogist |
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104 |
container_issue |
6 |
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857 |
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868 |
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1766053059951067136 |