Dislocation Creep of Diopside Aggregates Under Unsaturated Hydrous Conditions at a Confining Pressure of 300 MPa
文献类型：期刊论文
| 作者 | Li, Jianfeng3,4; Song, Maoshuang3,4; Wang, Hao3; Zhang, Guinan5; Mei, Shenghua1; Zheng, Xiaodong3,6; Wang, Xiaoning2; Jiang, Zhexuan3,6 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
 |
| 出版日期 | 2024-12-01 |
| 卷号 | 129期号:12页码:17 |
| 关键词 | upper mantle diopside water-weakening dislocation creep flow law |
| ISSN号 | 2169-9313 |
| DOI | 10.1029/2024JB029472 |
| 英文摘要 | To understand the dislocation creep behavior of clinopyroxene in the upper mantle, hot-pressed diopside aggregates without predrying treatment were triaxially deformed under water-unsaturated conditions at a confining pressure of 300 MPa, temperatures of 1323-1523 K, and strain rates of 10-6-10-4 s-1, using a Paterson gas-medium apparatus. Fourier transform infrared measurements of the water contents of the samples before and after deformation revealed that water diffusion loss occurred during the deformation process. A simple diffusion model based on Fick's law was established to predict the variation in the water content with respect to time during deformation. Fitting the mechanical data with a power flow law yielded a stress exponent n of 4.3 +/- 0.3, an activation energy Q of 427 +/- 31 kJ/mol and a water content exponent r of 1.2 +/- 0.2 for the dislocation creep of the diopside aggregates under water-unsaturated conditions. When the flow law was extrapolated to anhydrous and water-saturated conditions, the calculated flow strengths of the diopside aggregates were generally in agreement with the strengths determined directly by deformation experiments, but there also existed contribution from grain boundary water under water-saturated conditions. The results of our study indicate that the strength of diopside or upper mantle clinopyroxene is comparable to the strength of olivine under anhydrous conditions but weaker than that of olivine under water-saturated conditions in the dislocation creep regime. Therefore, diopside might dominate the rheological behavior in some clinopyroxene-enriched and hydrous regions of the upper mantle. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001381475600001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/81917]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Song, Maoshuang |
| 作者单位 | 1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, CAS Key Lab Expt Study Deep Sea Extreme Condit, Sanya, Peoples R China 2.Heilongjiang Univ Sci & Technol, Sch Min Engn, Harbin, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Peoples R China 4.CAS Ctr Excellence Deep Earth Sci, Guangzhou, Peoples R China 5.Hunan First Normal Univ, Sch Elementary Educ, Changsha, Peoples R China 6.Univ Chinese Acad Sci, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Jianfeng,Song, Maoshuang,Wang, Hao,et al. Dislocation Creep of Diopside Aggregates Under Unsaturated Hydrous Conditions at a Confining Pressure of 300 MPa[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2024,129(12):17. |
| APA | Li, Jianfeng.,Song, Maoshuang.,Wang, Hao.,Zhang, Guinan.,Mei, Shenghua.,...&Jiang, Zhexuan.(2024).Dislocation Creep of Diopside Aggregates Under Unsaturated Hydrous Conditions at a Confining Pressure of 300 MPa.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,129(12),17. |
| MLA | Li, Jianfeng,et al."Dislocation Creep of Diopside Aggregates Under Unsaturated Hydrous Conditions at a Confining Pressure of 300 MPa".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 129.12(2024):17. |
入库方式： OAI收割
来源：广州地球化学研究所
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