| DOI: | 10.1002/2014GL060607
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| 论文题名: | Grain-size sensitive rheology of orthopyroxene |
| 作者: | Bruijn R.H.C.; Skemer P.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9967
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| EISSN: | 1944-9698
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| 出版年: | 2014
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| 卷: | 41, 期:14 | | 起始页码: | 4894
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| 结束页码: | 4903
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| 语种: | 英语
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| 英文关键词: | deformation mechanism map
; flow law
; grain-size sensitive creep
; orthopyroxene
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| Scopus关键词: | Elasticity
; Grain size and shape
; Structural geology
; Constant temperature
; Deformation mechanism
; Deformation mechanism map
; Flow law
; Grain-size reduction
; Microstructural constraints
; Non-linear power law
; Orthopyroxene
; Creep
; creep
; deformation mechanism
; dislocation
; grain size
; orthopyroxene
; plate boundary
; rheology
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| 英文摘要: | The grain-size sensitive rheology of orthopyroxene is investigated using data from rheological and microstructural studies. A deformation mechanism map is constructed assuming that orthopyroxene deforms by two independent mechanisms: dislocation creep and diffusion creep. The field boundary between these mechanisms is defined using two approaches. First, experimental data from Lawlis (1998), which show a deviation from non-linear power law behavior at low stresses, are used to prescribe the location of the field boundary. Second, a new orthopyroxene grain-size piezometer is used as a microstructural constraint to the field boundary. At constant temperature, both approaches yield sub-parallel field boundaries, separated in grain size by a factor of only 2-5. Extrapolating to lithospheric conditions, the deformation mechanism transition occurs at a grain size of ~150-500 μm, consistent with observations from nature. As the transition from dislocation to diffusion creep may promote shear localization, grain-size reduction of orthopyroxene may play a prominent role in plate-boundary deformation. © 2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84906308962&doi=10.1002%2f2014GL060607&partnerID=40&md5=0b9bd3d9b3d7913ba2873bc0fe082231
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/7231
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Earth and Planetary Sciences, Washington University in St. Louis, Saint Louis, MO, United States
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| Recommended Citation: | |
Bruijn R.H.C.,Skemer P.. Grain-size sensitive rheology of orthopyroxene[J]. Geophysical Research Letters,2014-01-01,41(14).
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