| Item type |
文献 / Documents(1) |
| 公開日 |
2024-06-28 |
| アクセス権 |
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|
アクセス権 |
open access |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
journal article |
| 出版社版DOI |
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|
関連識別子 |
https://doi.org/10.1186/s40645-024-00637-8 |
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|
関連名称 |
10.1186/s40645-024-00637-8 |
| 出版タイプ |
|
|
出版タイプ |
VoR |
|
出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| タイトル |
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|
タイトル |
An automatic peak deconvolution code for Raman spectra of carbonaceous material and a revised geothermometer for intermediate- to moderately high-grade metamorphism |
| 著者 |
カネキ, シュンヤ
コウケツ, ユイ
青矢, 睦月
ナカムラ, ヨシヒロ
Wallis, Simon R.
シムラ, ユウスケ
ヤマオカ, ケン
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| 抄録 |
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|
内容記述 |
Carbonaceous material (CM) undergoes progressive changes that reflect its thermal history. These changes are in general irreversible and provide valuable information for understanding diagenetic and metamorphic processes of crustal rocks. Among various approaches to quantify these changes, the R2 ratio, area ratio of specific peaks in CM Raman spectra, is widely used to estimate the maximum temperature of intermediate- to moderately high-grade metamorphism. The calculation of the R2 ratio requires peak deconvolution of the original spectrum, and the results depend on the details of how this is carried out. However, a clear protocol for selecting appropriate initial conditions has not been established and obtaining a reliable temperature estimate depends at least in part on the experience and skill of the operator. In this study, we developed a Python code that automatically calculates the R2 ratio from CM Raman spectra. Our code produces R2 ratios that are generally in good agreement with those of Aoya et al. (J Metamorph Geol 28:895–914, 2010, https://doi.org/10.1111/j.1525-1314.2010.00896.x) for the same Raman data, with much less time and effort than was the case in the previous studies. We have confirmed that the code is also applicable to other previous datasets from both contact and regional metamorphic regions. The overall trend of the recalculated data indicates that samples with R2 greater than ~ 0.7 are not sensitive to the changes in CM maturity and thus should not be used for the calibration of an R2-based geothermometer. We propose a modified geothermometer for contact metamorphism that is strictly applicable to samples with R2 from 0.023 to 0.516, with the proviso that a laser with a wavelength of 532 nm should be used. A slight extrapolation of the newly proposed geothermometer up to R2 of 0.57 provides a temperature estimate that is consistent with the geothermometer of Kaneki and Kouketsu (Island Arc 31:e12467, 2022; https://doi.org/10.1111/iar.12467); the boundary between the two geothermometers corresponds to a temperature of 391 °C. |
| キーワード |
|
|
主題 |
Automatic peak deconvolution |
| キーワード |
|
|
主題 |
Carbonaceous material |
| キーワード |
|
|
主題 |
Contact metamorphism |
| キーワード |
|
|
主題 |
Geothermometer |
| キーワード |
|
|
主題 |
Raman spectroscopy |
| 書誌情報 |
en : Progress in Earth and Planetary Science
巻 11,
p. 35,
発行日 2024-06-25
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| 収録物ID |
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収録物識別子タイプ |
ISSN |
|
収録物識別子 |
21974284 |
| 出版者 |
|
|
出版者 |
BioMed Central |
| 出版者 |
|
|
出版者 |
Springer Nature |
| 権利情報 |
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|
権利情報 |
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
| EID |
|
|
識別子 |
409050 |
| 言語 |
|
|
言語 |
eng |
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