Depositional processes of travertine developed at Shionoha hot spring, Nara Prefecture, Japan
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- Takashima Chizuru
- Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University
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- Kano Akihiro
- Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University
Bibliographic Information
- Other Title
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- 奈良県入之波温泉に発達するトラバーチンの堆積過程
- ナラケン シオノハ オンセン ニ ハッタツ スル トラバーチン ノ タイセキ カテイ
- Depositional process of travertine developed at Shionoha hot spring, Nara Prefecture, Japan
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Abstract
A large-scale travertine deposit is developed at Shionoha hot spring (Kawakami Village, Nara Prefecture). The water from the vent is relatively low in temperature (38~39ºC), high in CO2 and Ca2+, and DO-free. Chemical and stable isotopic compositions of the vent water indicate that water of a meteoric origin is circulated in deep, and that deep-originated CO2 is reacted with rock. The vent water, during flowing a 70 m-long valley, first deposits Fe-rich deposits and then calcitic travertines. Changes of dissolved Fe2+ and Ca2+ in the water along the valley are consistent with distributions of the Fe-rich deposits and the calcitic travertine.<br>Near the vent, Fe-rich deposit is formed partly due to quick uptake of oxygen from the atmosphere. However, its texture showing upward-branching filaments of 10-20 μm thick indicates that metabolism of iron-oxidizing bacteria probably controls formation of the iron precipitate. Results of XRD, EPMA and TEM-EDS indicate that the Fe-mineral is amorphous ferrihydrite. Calcite precipitation becomes dominant in the lower valley, and forms travertine domes. The travertines exhibit various textures, including of submilimeter-milimeter order lamination, which consists of bundles of needle-shape calcite crystals intercalating with fine-grained layers. Observation result indicates that about 40 bands were formed during a period of 41 days. Therefore, the banded texture was defined as daily rings. Depositional rates were evaluated about 5 mm/year for the Fe-rich deposit, and 20 cm/year for a laminated travertine.<br>
Journal
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- The Journal of the Geological Society of Japan
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The Journal of the Geological Society of Japan 111 (12), 751-764, 2005
The Geological Society of Japan
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Details 詳細情報について
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- CRID
- 1390001206238500992
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- NII Article ID
- 110003496090
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- NII Book ID
- AN00141768
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- COI
- 1:CAS:528:DC%2BD28XhtFKhsrY%3D
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- ISSN
- 13499963
- 00167630
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- NDL BIB ID
- 7781489
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed