2013 Fiscal Year Final Research Report
Dislocation structure around fluid inclusions in olivine and orthopyroxene
| Project/Area Number |
23654160
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Hokkaido University (2012-2013)
Kyoto University (2011) |
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Principal Investigator |
YAMAMOTO Junji 北海道大学, 総合博物館, 准教授 (60378536)
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| Co-Investigator(Kenkyū-buntansha) |
KAGI Hiroyuki 東京大学, 理学系研究科, 教授 (70233666)
OHFUJI Hiroaki 愛媛大学, 地球深部ダイナミクス研究センター, 准教授 (80403864)
ISHIBASHI Hidemi 静岡大学, 理学部, 講師 (70456854)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 転位 / 塑性変形 / 流体包有物 / マントル捕獲岩 |
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| Research Abstract |
Dislocations provide a direct proof of plastic deformation of minerals. We observed dislocation structure around fluid inclusions in olivine and orthopyroxene. For olivine, development of edge dislocations with loop shape whose size is analogous to that of an adjacent fluid inclusion indicate that the dislocations result from excess pressure of the fluid inclusion. The generation of loop dislocations would be controlled by yield strength of slip systems of olivine. For orthopyroxene, a few screw dislocations are identified in c-axis. The difference in dislocation density between both minerals suggests the higher yield strength of orthopyroxene. This is verified by the fact that expansion of a fluid inclusion in olivine estimated by dislocation structure can well explain difference in CO2 fluid density between the minerals. The observation of dislocation structure around fluid inclusions in xenoliths is useful to assess relative strength of slip systems among minerals.
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[Journal Article] Lateral magma intrusion from a caldera-forming magma chamber : Constraints from geochronology and geochemistry of volcanic products from lateral cones around the Aso caldera2013
Author(s)
Miyoshi M., Shinmura T., Sumino H., Sano T., Miyabuchi Y., Mori Y., Inakura H., Furukawa K., Uno K., Hasenaka T., Nagao K., Arakawa Y. and Yamamoto J
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Journal Title
SW Japan. Chemical Geology
Volume: 352
Pages: 202-210
Peer Reviewed
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