| Project/Area Number |
25800284
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Geology
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| Research Institution | Japan Agency for Marine-Earth Science and Technology |
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Principal Investigator |
TANIKAWA Wataru 独立行政法人海洋研究開発機構, 高知コア研究所, 主任研究員 (70435840)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Keywords | 間隙率 / 熱物性 / 水分活性 / 地下生命圏 / 続成作用 / 褐炭層 / 堆積盆地 / IODP第337次研究航海 / 熱伝導率 / 温度構造 / 透水係数 / 間隙径分布 / 海底下微生物 |
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| Outline of Final Research Achievements |
Microbial biomass in the deep ocean sediments is controlled by physical properties. Therefore, in this study, a series of physical property measurements (Thermal property, porosity, permeability, and water activity) were conducted on the sediment cores at site C0020 from IODP expedition 337 and at site 902 from the Chikyu shakedown cruise (CY06-06) in Sanriku-oki basin. Thermal property measurement revealed that temperature at depth is mainly controlled by the porosity and mineral composition of sediments. Water activity was very high for all the sediment, and we found that chemical composition of pore water controls the water activity. Positive correlation between porosity and microbial biomass was clearly observed, though the relationship between water activity and biomass was unclear. Our result suggests that porosity and pore diameter will mainly control the microbial activity at depth.
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