2011 Fiscal Year Final Research Report
Paleobiogeographic reconstruction of marine plankton diatoms in the Pacific Ocean
| Project/Area Number |
20540460
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | National Museum of Nature and Science, Tokyo |
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Principal Investigator |
TANIMURA Yoshihiro 独立行政法人国立科学博物館, 地学研究部環境変動史研究グループ, グループ長 (80141985)
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| Project Period (FY) |
2008 – 2011
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| Keywords | 太平洋 / 珪藻 / 古生物地理 |
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| Research Abstract |
Relationships between the evolution of surface water circulation systems in the Neogene Pacific, and the temporal and spacial distribution of cosmopolitan plankton diatoms Thalassionema and Cavitatus species in eight DSDP-ODP cores, were studied. Subtropical Gyre, weakly developed in the Early Miocene and became stronger by the Late Miocene in association with closure of the Indonesian Seaway, highly probably caused nearly simultaneous extinctions of Cavitatus species in the South Pacific, and migration of some Thalassionema species to the south and to the north in the Pacific.
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