| Project/Area Number |
14F04799
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Single-year Grants |
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| Section | 外国 |
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| Research Field |
Petrology/Mineralogy/Economic geology
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| Research Institution | Nagoya University |
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Principal Investigator |
WALLIS R・Simon 名古屋大学, 環境学研究科, 教授 (30263065)
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| Co-Investigator(Kenkyū-buntansha) |
CLARK NICOLA 名古屋大学, 環境学研究科, 外国人特別研究員
CLARK Nicola 名古屋大学, 環境学研究科, 外国人特別研究員
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| Project Period (FY) |
2014-04-25 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2016: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2015: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2014: ¥200,000 (Direct Cost: ¥200,000)
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| Keywords | Bolivia / Tufa / Altiplano / Paleoenvironment / tufa / paleoclimate / ostracods / bioherm / 南米 / 湖 / 古環境 / 古段丘 / 炭酸塩岩 / 安定同位体 |
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| Outline of Annual Research Achievements |
The 14C dating of tufa samples from Laguna Hedionda suggests that the age of this deposit is 10,036 to 9,642 cal yrs BP. Stable isotope analysis of tufa from Uyuni overlap with previous studies of tufa from the same area (δ18O +0.73 ± 0.05 to －2.59 ± 0.05‰ and δ13C +4.78 ± 0.02 to +2.94 ± 0.02‰) that formed during the last major lake phases. Analysis of tufa from the Lipez Lakes are internally consistent and, after secondary carbonate values are removed, illustrate a difference between the capping tufa found around Laguna Hedionda and Chiar Khota (δ18O +2.55 to －0.12‰ and δ13C +6.23 to +1.29‰) and the beach tufa found around Laguna Honda and Ramaditas (δ18O +2.93 to +1.29‰ and δ13C +5.23 to +1.60‰). For this study the capping tufa is the most appropriate to examine in more detail as it is less likely to have been contaminated by groundwater.
The data show a general signal of aridity across all tufa samples, as well as high-resolution evidence for annual or seasonal variations in rapidly formed laminated tufa. Combined with the age data from these deposits it can be suggested that the formation of these tufa, as well as Lipez Lakes above present day depths, is associated with the wet phase in the northern Chile basins to the south rather than the large lakes on the central and northern Altiplano to the north. Further work needs to be carried out in the remote regions on the Altiplano to find further high-resolution climate proxies to better understand regional climate systems.
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| Research Progress Status |
28年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
28年度が最終年度であるため、記入しない。
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