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ID 48719
本文ファイル
著者
Hirono, Tetsuro
Maekawa, Yuka
キーワード
carbonaceous material
Chelungpu fault
1999 Chi‐Chi earthquake
frictional heat
fault gouge
抄録(英)
To understand the mechanism of fault lubrication during the 1999 Taiwan Chi‐Chi earthquake, we developed a new temperature proxy for carbonaceous materials by using infrared and Raman spectroscopies together with heating and friction experiments. We found marked anomalies in the infrared and Raman spectra of carbonaceous materials retrieved from the primary slip zone of the earthquake: the infrared spectra exhibited very weak aliphatic CH2 and CH3 peaks and aromatic C=C absorbance peaks, and the Raman spectra exhibited very weak disordered and graphitic bands and a high ratio of disordered band area to graphitic band area. Those weak peaks and bands and the band area ratio were reproduced by heating carbonaceous materials from the nearby host rock to 700°C. These results suggest that the frictional heat in the slip zone reached approximately 700°C. We characterized the host rock's carbonaceous materials by means of elemental analysis, pyrolysis‐gas chromatography‐mass spectrometry, and simultaneous thermogravimetry‐differential scanning calorimetry and found that the H/C and O/C ratios were 1.29 and 0.30, respectively (which are close to the ratios for lignin) and that the volatile fraction was as high as 48 wt %. The pyrolysates obtained by heating from 100 to 400°C were dominated by phenols, fatty alcohols, and n‐alkanes. When the residue from pyrolysis at 100–400°C was rapidly heated to 700°C, the resulting pyrolysate was dominated by phenols, aromatic compounds, heterocyclic compounds, and n‐alkenes. This information suggests that change in the infrared and Raman spectra with increasing temperature may have been due to decomposition and aromatization reactions during pyrolysis. Rapid heating during earthquake slip may promote reactions of carbonaceous materials that are different from the reactions that occur during long‐term geological metamorphism.
内容記述
This research was supported by a Grant-in-Aid for Young Scientists (A) from the Japan Ministry of Education, Science, Sports, and Culture (23684039, 2013).
掲載誌名
Geochemistry, Geophysics, Geosystems
16巻
5号
開始ページ
1233
終了ページ
1253
出版年月日
2015-05-02
出版者
American Geophysical Union
ISSN
1525-2027
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
An edited version of this paper was published by AGU. Copyright 2015 American Geophysical Union.
関連情報URL
部局名
理学研究科