Dislocation structure around fluid inclusions in olivine and orthopyroxene

橄榄石和斜方辉石中流体包裹体周围的位错结构

• 批准号: 23654160
• 负责人: YAMAMOTO Junji
• 金额: $ 2万
• 依托单位: Hokkaido University (2012-2013)Kyoto University (2011)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23654160/
• 关键词: 転位; 塑性変形; 流体包有物; マントル捕獲岩; 高圧実験; レオロジー; マントル

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.

位错是矿物塑性变形的直接证据。我们观察到橄榄石和斜方辉石中流体包裹体周围的位错结构。对于橄榄石，发育与邻近流体包裹体尺寸相似的环形边缘位错，表明位错是流体包裹体超压造成的。环位错的产生受橄榄石滑移系屈服强度的控制。斜方辉石在c轴方向有少量螺位错。两种矿物位错密度的差异表明斜方辉石的屈服强度较高。用位错结构估算的橄榄石中流体包裹体的膨胀可以很好地解释矿物间CO2流体密度的差异。捕虏体中流体包裹体周围位错结构的观察有助于评价矿物间滑移系的相对强度。

项目成果

Thermal structure beneath Far Eastern Russia inferred from geothermobarometric analyses of mantle xenoliths: Direct evidence for high geothermal gradient in backarc lithosphere

• DOI: 10.1016/j.tecto.2012.06.005
• 发表时间: 2012-07
• 期刊: Tectonophysics
• 影响因子: 2.9
• 作者: J. Yamamoto;K. Nishimura;H. Ishibashi;H. Kagi;S. Arai;V. Prikhod'ko

Noble gas isotopic compositions of mantle xenoliths in a kimberlite

金伯利岩中地幔捕虏体的稀有气体同位素组成

• 发表时间: 2011
• 作者: Yamamoto J.;Kurz M.D.;Ishibashi H. and Curtice J.
• 通讯作者: Ishibashi H. and Curtice J.

背弧リソスフェアから推察する海洋リソスフェアの行く末

从弧后岩石圈推断大洋岩石圈的未来

• 发表时间: 2012
• 作者: 湯浅万紀子;山本順司;伊東 素代;伊藤 優人;山本順司
• 通讯作者: 山本順司

Sr and Nd isotope ratios and trace element concentrations in kimberlites from Shandong and Liaoning (China) and the Kimberley area (South Africa)

中国山东、辽宁和南非金伯利地区金伯利岩中 Sr 和 Nd 同位素比值及微量元素浓度

• 发表时间: 2012
• 期刊: Geochem. J.
• 作者: Toyama C.;Muramatsu Y.;Yamamoto J.;Nakai S. and Kaneoka I
• 通讯作者: Nakai S. and Kaneoka I

Sr and Nd isotope ratios and trace element concentrations in kimberlites from Shandong and Liaoning (China) and the Kimberley area (South Africa).

山东和辽宁（中国）以及金伯利地区（南非）金伯利岩中 Sr 和 Nd 同位素比值和微量元素浓度。

• 发表时间: 2012
• 期刊: Geochemical Journal
• 影响因子: 0.8
• 作者: 佐伯 和人;実政 光久;Chiaki Toyama
• 通讯作者: Chiaki Toyama