| Project/Area Number |
26707027
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Partial Multi-year Fund |
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| Research Field |
Geology
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| Research Institution | Kumamoto University |
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Principal Investigator |
Onoue Tetsuji 熊本大学, その他の研究科, 准教授 (60404472)
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| Research Collaborator |
EBIHARA Mitsuru 首都大学東京, 大学院理工学研究科, 教授
NOZAKI Tatsuo 海洋研究開発機構, 海底資源研究開発センター, 研究員
SATO Honami 海洋研究開発機構, 海底資源研究開発センター, 日本学術振興会特別研究員
SUZUKI Katsuhiko 海洋研究開発機構, 海底資源研究開発センター, 研究開発センター長代理
YAMASHITA Katsuyuki 岡山大学, 大学院自然科学研究科, 准教授
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥24,440,000 (Direct Cost: ¥18,800,000、Indirect Cost: ¥5,640,000)
Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2015: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2014: ¥19,370,000 (Direct Cost: ¥14,900,000、Indirect Cost: ¥4,470,000)
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| Keywords | 天体衝突 / 三畳紀 / チャート / 絶滅 / 放散虫 / 地質学 / 地球化学 / 層位・古生物学 |
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| Outline of Final Research Achievements |
This study investigated the extraterrestrial matter in the Permian to Jurassic bedded chert sequences from the Mino Belt, central Japan. A large impact event was detected in the Upper Triassic bedded cherts using platinum group elements (PGE) and osmium (Os) isotope ratio as a tracer. The relatively flat CI-chondrite normalized patterns of the least mobile PGEs (Ir, Ru, and Rh) and the Ru/Ir ratio determined by linear regression analysis suggest that a chondritic impactor is the source of the PGE anomalies preserved in claystone samples from the study sections. The chondritic impactor of the suggested size (3.3-7.8 km in diameter) implies that a large amount of debris and/or climatically active gasses (e.g., sulfur oxides) would have been released from the impactor, which would have had a marked effect on the environment. An analysis of patterns of radiolarian extinction reveals a high extinction rate in the 1 Myr interval after the impact event.
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