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Influence of Compaction Length on Radial Melt Segregation in Torsionally Deformed Partially Molten Rocks
Qi, Chao1,2; Kohlstedt, David L.1
2018-11-01
发表期刊GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
ISSN1525-2027
卷号19期号:11页码:4400-4419
摘要To investigate the influence of compaction length on radial melt segregation during torsional shear deformation of partially molten rocks, experiments were performed on samples composed of olivine plus approximate to 7vol.% of either an albite, alkali basalt, or lithium silicate melt. These three melts cover a range of three orders of magnitude in viscosity, yielding samples that vary by approximately two orders of magnitude in compaction length. Samples were deformed in torsion at 1,473K and 300MPa in constant strain rate experiments to outer-radius shear strains of up to 14.3. Radial melt segregation occurred toward the axial center in all three types of samples that were sheared to (R) 4. At the same strain, samples with the largest compaction length exhibited the highest segregation rate, while samples with intermediate and smallest compaction lengths exhibited similar segregation rates. The experimental observations qualitatively agree with previously published results from two-phase flow theory for base-state melt segregation with anisotropic viscosity; specifically, the segregation rate for radial melt segregation increases with increasing compaction length. However, quantitatively, the segregation rate in experiments is smaller than the rate predicted by simulations for the same compaction length. This discrepancy may, for example, reflect the difference in rheological behavior between that observed in our experiments (non-Newtonian, dislocation-accommodated creep) and that incorporated into the numerical models (Newtonian, diffusion-accommodated creep). Our results thus provide a baseline for testing current and future models of two-phase flow, particularly as applied to understanding melt migration, segregation, and extraction from Earth's deeper interior.
关键词partial melts torsion melt segregation compaction length
DOI10.1029/2018GC007715
资助者NSF ; NSF ; NSF ; NSF ; NSF ; NSF ; NSF ; NSF
关键词[WOS]VISCOUS ANISOTROPY ; UPPER-MANTLE ; BAND FORMATION ; STRESS ; SHEAR ; PERMEABILITY ; DEFORMATION ; STRAIN ; CONSEQUENCES ; CONSTRAINTS
语种英语
资助项目NSF[EAR-1520647]
资助者NSF ; NSF ; NSF ; NSF ; NSF ; NSF ; NSF ; NSF
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000452727800016
出版者AMER GEOPHYSICAL UNION
引用统计
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/90279
专题中国科学院地质与地球物理研究所
通讯作者Qi, Chao
作者单位1.Univ Minnesota, Dept Earth Sci, Minneapolis, MN 55455 USA
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
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GB/T 7714
Qi, Chao,Kohlstedt, David L.. Influence of Compaction Length on Radial Melt Segregation in Torsionally Deformed Partially Molten Rocks[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2018,19(11):4400-4419.
APA Qi, Chao,&Kohlstedt, David L..(2018).Influence of Compaction Length on Radial Melt Segregation in Torsionally Deformed Partially Molten Rocks.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,19(11),4400-4419.
MLA Qi, Chao,et al."Influence of Compaction Length on Radial Melt Segregation in Torsionally Deformed Partially Molten Rocks".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 19.11(2018):4400-4419.
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