Estimated peak metamorphic temperature of the Sanbagawa schists from Nagatoro area, Kanto Mountains, using Raman microspectrometry on carbonaceous materials
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Izumi Rio : Kanagawa Prefectural Police
Watanabe Taiga : Chiba prefectural junior high school
抄録
The deformation regime of the Sanbagawa metamorphic rocks of the Kanto Mountains have long been controversial, whether it is one plastic continuous body or it is composed of several parts separated by faults or thrusts. One of the key must lie in the area where rocks with different mineral assemblage are found adjacent to each other. Most of the Nagatoro area is categorized as the lowest metamorphic grade zone which is defined by the mineral assemblage without garnet. Several outcrops in this area are known to contain garnet. It has been argued that the appearance of garnet indicates juxtaposition of rocks from different metamorphic grade, suggesting structural discontinuity. To investigate whether the local garnet occurrence was the discontinuity, Raman microspectrometry was applied carbonaceous materials in 27 rock samples in a continuous outcrop in this study. The estimated temperature was 400 to 460℃ with no structural gap or tendency recognizable when mapped. Samples with and without garnet both produced results comparable to each other. No evidence was obtained to show that the local garnet occurrence at the outcrop is due to structural discontinuity. The estimated temperature range was consistent with the beginning condition of the garnet formation. It is likely that the boundary between the garnet bearing rocks and those without garnet was originally continuous, with the condition just on the border to start growing garnet.
雑誌名
国士舘大学理工学部紀要
巻
11
ページ
55 - 60
発行年
2017-11-30
出版者
国士舘大学理工学部
ISSN
1882-4013
NCID
AA12316266
論文ID(NAID)
40021625215
NDC
455.1
フォーマット
application/pdf
著者版フラグ
publisher
キーワード
Garnet | Sanbagawa metamorphic belt | Kanto Mountains | temperature | Raman spectrometry | 関東山地 三波川変成帯
Estimated peak metamorphic temperature of the Sanbagawa schists from Nagatoro area, Kanto Mountains, using Raman microspectrometry on carbonaceous materials
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