2002 Fiscal Year Final Research Report Summary
Fundamental study on rhenium - osmium dating for mudstones
| Project/Area Number |
13640460
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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 |
Geology
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| Research Institution | Kobe University |
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Principal Investigator |
TERAKADO Yasutaka Kobe University, Faculty of Human development, Associate Professor, 発達科学部, 助教授 (30127378)
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| Project Period (FY) |
2001 – 2002
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| Keywords | rhenium / osmium / dating / sedimentary rocks |
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| Research Abstract |
An early stage of the present project, developmental efforts for Re-Os analyses were made. The Re mass spectrometry was usually disturbed by filament blank, but finally successful measurements were attained. However, the contribution of filament Re is still large, and our efforts must be given to reduce such effect.
The Re-Os dating method were applied to several kinds of samples such as Permian Akasaka limestones, late Jurassic mudstones from Tamba group, Miocene mudstones from Shimane Prefecture, present-day river and marine sediments. Those data indicate two important aspects: (1) Most of the limestones and mudstones undergone severe thermal event during diagenetic processes are not suitable for Re-Os dating. Re might tend to be mobilized during such processes. (2) However, relatively young mudstones, which did not undergo thermal damage, can yields reasonable age, and thus are suitable for Re-Os dating.
Finally, although application of Re-Os method to sedimentary rocks might be restricted to relatively young rocks, this method must deserve attention for further geological investigations.
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Research Products
(8 results)
