| Project/Area Number |
25800288
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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 |
Stratigraphy/Paleontology
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| Research Institution | Meiji University (2014-2016)
Kyushu University (2013) |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | ジュラ紀 / 温室期 / 古太平洋 / 海洋循環 / 石灰岩 / 炭素同位体比 / 地域間対比 / 厚歯二枚貝 / 研究計画の繰り越し / 古海洋学 / 炭酸塩 / 礁性生物相 / 白亜紀 / 鳥巣式石灰岩 / バウ石灰岩 |
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| Outline of Final Research Achievements |
Carbon isotope stratigraphy of the Late Jurassic and earliest Cretaceous was revealed from Torinosu-type limestone, which was deposited in a shallow-marine setting in the Paleo-Pacific Ocean, in Japan. The age-model was established using Sr isotope ratio and fossil occurrence. The composite δ13C profile from the two limestone sections can be correlated with the profiles of relevant ages from the Alpine Tethyan region. In addition, we found that δ13C values of the Torinosu-type limestone are ~1‰ lower than the Tethyan values in the late Kimmeridgian. This inter-regional difference gradually reduces and disappears in the late Tithonian. This isotopic homogenization is probably due to changes in the continental distribution and the global ocean circulation during this time.
In addition, I studied rudistid bivalve in Torinosu-type Limestone. I found primitive requieniidine rudists lived in shallow-water depositional environment in a calm setting on a small carbonate mound.
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