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Diffusion Creep of Enstatite at High Pressures Under Hydrous Conditions
Zhang, Guinan1,2,3; Mei, Shenghua3,4; Song, Maoshuang1; Kohlstedt, David L.3; Mei, Shenghua(Univ Minnesota, Dept Earth Sci, Minneapolis, MN 55455 USA); Song, Maoshuang(Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Guangdong, Peoples R China)
2017-10-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
Volume122Issue:10Pages:7718-7728
Contribution Rank第1完成单位 ; 第2完成单位 ; 第3完成单位 ; 第4完成单位
AbstractMantle convection and large-scale plate motion depend critically on the nature of the lithosphere-asthenosphere boundary and thus on the viscosity structure of Earth's upper mantle, which is determined by the rheological properties of its constituent minerals. To constrain the flow behavior of orthopyroxene, the second most abundant constituent of the upper mantle, deformation experiments were carried out in triaxial compressive creep on fine-grained (similar to 6m) samples of enstatite at high pressures (3.8-6.3GPa) and high temperatures (1323-1573K) using a deformation-DIA apparatus. Based on results from this study, the deformation behavior of enstatite is quantitatively presented in the form of a flow law that describes the dependence of deformation rate on differential stress, water fugacity, temperature, and pressure. Specifically, the creep rate depends approximately linearly on stress, indicating deformation in the diffusion creep regime. A least squares regression fit to our data yielded a flow law for diffusion creep with an activation energy of similar to 200kJ/mol and an activation volume of similar to 14x10(-6)m(3)/mol. The magnitude of the water-weakening effect is similar to that for olivine with a water fugacity exponent of r approximate to 0.7. This strong dependence of viscosity on water fugacity (concentration) indicates that the viscosity of an orthopyroxene-bearing mantle varies from one geological setting to another, depending on the large-scale water distribution. Based on the rheology contrast between olivine and enstatite, we conclude that olivine is weaker than enstatite throughout most of the upper mantle except in some shallow regions in the diffusion creep regime.
SubtypeArticle
KeywordEnstatite Diffusion Creep Water Fugacity Mantle Viscosity
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1002/2017JB014400
URL查看原文
Indexed BySCI
Language英语
WOS KeywordMANTLE SHEAR ZONE ; GRAIN-SIZE ; ORTHO-PYROXENE ; RHEOLOGICAL PROPERTIES ; PERIDOTITE MASSIF ; LATTICE STRAINS ; WATER-CONTENT ; TWIN SISTERS ; OLIVINE ; DEFORMATION
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000418577900013
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Document Type期刊论文
Identifierhttp://ir.idsse.ac.cn/handle/183446/5277
Collection深海科学研究部_深海极端环境模拟研究实验室
Corresponding AuthorMei, Shenghua; Song, Maoshuang; Mei, Shenghua(Univ Minnesota, Dept Earth Sci, Minneapolis, MN 55455 USA); Song, Maoshuang(Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Guangdong, Peoples R China)
Affiliation1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Dept Earth Sci, Beijing, Peoples R China
3.Univ Minnesota, Dept Earth Sci, Minneapolis, MN 55455 USA
4.Chinese Acad Sci, Inst Deep Sea Sci & Engn, CAS Key Lab Expt Study Deep Sea Extreme Condit, Sanya, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Guinan,Mei, Shenghua,Song, Maoshuang,et al. Diffusion Creep of Enstatite at High Pressures Under Hydrous Conditions[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2017,122(10):7718-7728.
APA Zhang, Guinan,Mei, Shenghua,Song, Maoshuang,Kohlstedt, David L.,Mei, Shenghua,&Song, Maoshuang.(2017).Diffusion Creep of Enstatite at High Pressures Under Hydrous Conditions.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,122(10),7718-7728.
MLA Zhang, Guinan,et al."Diffusion Creep of Enstatite at High Pressures Under Hydrous Conditions".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 122.10(2017):7718-7728.
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