2015 Fiscal Year Final Research Report
Paleoenvironmental change during the Late Ordovician and Early Silurian time
| Project/Area Number |
25400495
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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 | University of Tsukuba |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
MARUOKA Teruyuki 筑波大学, 生命環境系, 准教授 (80400646)
SASHIDA Katsuo 筑波大学, 生命環境系, 教授 (60134201)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | 生層序 / 炭素同位体 / 硫黄同位体 / 古環境 |
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| Outline of Final Research Achievements |
This study reconstructs an environmental change during the latest Ordovician to earliest Silurian time, when a mass extinction occurred, based on the paleontological, sedimentological, and geochemical analyses. The end-Ordovician global cooling is widely accepted as being the cause of the extinction. The sedimentological study and the carbon isotopic analysis show that this study area also went through a cooling and regression events in the Late Ordovician. The carbon/sulfur ratio reveals that recovery of the environment took a relatively long time and that the climate was gradually getting warm with a cyclic alternation of warm and cool periods throughout the Early Silurian. The sedimentological and micropaleontological data also support this conclusion.
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| Free Research Field |
微古生物学
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