Howieite in meta-manganese siliceous rocks of Kurosegawa belt, western Kyushu, Japan
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- IBUKI Masaru
- Division of Earth and Planetary Sciences, Department of Geology and Mineralogy, Graduate School of Science, Kyoto University
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- FUJIMOTO Yoshikazu
- Nittetsu-Kogyo co.
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- TAKAYA Masaki
- Division of Earth and Planetary Sciences, Department of Geology and Mineralogy, Graduate School of Science, Kyoto University
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- MIYAKE Akira
- Division of Earth and Planetary Sciences, Department of Geology and Mineralogy, Graduate School of Science, Kyoto University
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- HIRAJIMA Takao
- Division of Earth and Planetary Sciences, Department of Geology and Mineralogy, Graduate School of Science, Kyoto University
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説明
Howieite (Hw) was recently found in meta-manganese siliceous rocks intercalated with lawsonite blueschists in the Hakoishi serpentinite mélange of the Kurosegawa belt, Yatsushiro, Kyushu, Japan; the peak pressure and temperature conditions were around 0.7-0.9 GPa and <350 °C, respectively. Hw is closely associated with Mn-rich stilpnomelane (Mn-stp), riebeckite, lawsonite, aegirine, calcite, quartz, and opaque minerals. Both Hw and Mn-stp occur as acicular to fine-grained aggregates and show yellow to pale yellow pleochroism. Electron microprobe analysis suggests that the distribution of Hw is relatively homogeneous in each grain, with an average composition of (Na1.19K0.01)1.21(Fe2+4.87Mn4.07Mg0.71)9.65(Fe3+1.11Al0.89)2.00(Si12.06Ti0.07)12.12O31(OH)13.<br> Taneyamalite (Tn), a Mn-dominant member of Hw, has been reported from a Mn ore bed in the study area by Aoki et al. (1981). The difference in Mn content between Hw and Tn in the study area may be a consequence of the variety of host rock compositions present. The literature data and this study suggest that chlorite and white mica, which are representative hydrous phases in low-grade metamorphic rocks, are scarce or not present in meta-manganese siliceous rocks containing Hw or Tn. Therefore, we emphasize that Hw-Tn series minerals (along with Mn-stp) act as major water storage in meta-manganese siliceous rocks under low-temperature (<350 °C) conditions.
収録刊行物
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- Journal of Mineralogical and Petrological Sciences
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Journal of Mineralogical and Petrological Sciences 103 (5), 365-370, 2008
一般社団法人 日本鉱物科学会
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詳細情報 詳細情報について
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- CRID
- 1390001206546118144
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- NII論文ID
- 10022079566
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- NII書誌ID
- AA11460926
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- ISSN
- 13493825
- 13456296
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
- OpenAIRE
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- 抄録ライセンスフラグ
- 使用不可
