Onset and termination of harsh environments during the latest Paleozoic to earliest Mesozoic Panthalassic Ocean
| Project/Area Number |
24540499
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | Kyushu University |
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Principal Investigator |
Sano Hiroyoshi 九州大学, 理学(系)研究科(研究院), 教授 (80136423)
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| Co-Investigator(Kenkyū-buntansha) |
SASHIDA Katsuo 筑波大学, 大学院生命科学研究科, 教授 (60134201)
AGEMATSU Sachiko 筑波大学, 大学院生命科学研究科, 准教授 (50466661)
KUWAHARA Kiyoko 芦屋大学, 教育学部, 講師 (20507131)
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| Project Period (FY) |
2012-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | ペルム紀末大量絶滅 / 環境回復 / 前期三畳紀 / パンサラッサ海 / 大量絶滅 / 深海堆積物 / ペルム紀・三畳紀境界 / 劣悪環境 / 三畳紀古世 / 三畳紀前期 / PT境界 |
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| Outline of Final Research Achievements |
We focused upon termination of harsh environments in the aftermath of end-Permian extinction event. Results are summarized as follows; (1) Marine harsh condition (O2-depleted) almost terminated no later than late Olenekian (Spathian) and radiolarian ecosystem fully recovered in a pelagic realm. Late Olenekian oxic condition was punctated by short-lived dysoxic events, which resulted in deposition of thin high-C claystone within grayish bedded chert. (2) Fully oxic condition returned in early Middle Triassic (early Anisin) after repetition of oxic/dysoxic condition. These two points mean unstable environments in late Early Triassic. (3) We found basaltic sandstone and conglomerate in the Lower Triassic siliceous claystone and postulate basaltic rocks as basement for Lower Triassic siliceous claystone. Displacement of basaltic debris by turbiditic and debris flows implies movement of water mass that has potential for mixing of seawater and oxygen supply into deep-marine environment.
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Report
(5 results)
Research Products
(22 results)
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[Journal Article] Lithostratigraphy and sedimentology of the Shirahama Group around Shimoda District, Izu Peninsular, central Japan.2015
Author(s)
Utagawa, F., Agematsu, S., Tsunogae, T. and Sashida, K.,
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Journal Title
Bulletin of the National Museum of Nature and Science, Series C (Geology and Paleontology)
Volume: 41
Pages: 1-15
Related Report
Peer Reviewed
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