Effect of iron content on the creep behavior of olivine: 1. Anhydrous   conditions

doi:10.1016/j.epsl.2009.08.006

CORC > 北京大学 > 地球与空间科学学院

	Effect of iron content on the creep behavior of olivine: 1. Anhydrous conditions
	Zhao, Yong-Hong ; Zimmerman, Mark E. ; Kohlstedt, David L.
刊名	earth and planetary science letters
	2009
关键词	Fe content olivine creep rheology experiments deformation Mars mantle HIGH-TEMPERATURE CREEP PLASTIC-DEFORMATION ACCRETION HISTORY DISLOCATION CREEP SINGLE-CRYSTALS UPPER-MANTLE GRAIN-SIZE WATER RHEOLOGY REGIME
DOI	10.1016/j.epsl.2009.08.006
英文摘要	High-temperature, high-pressure triaxial compressive creep experiments were carried out on polycrystalline samples of olivine, (Fe(x)Mg(1-x))(2)SiO(4), with x Fe/(Fe + Mg) = 1.0, 0.75, 0.5, and 0.3 to investigate the influence of Fe content on rheological properties of olivine under anhydrous conditions. Samples with grain sizes of < 50 mu m were deformed at differential stresses of 50 to 300 MPa primarily in the dislocation-accommodated grain boundary sliding creep regime for temperatures between 1273 and 1473 K with a confining pressure of 300 MPa. Our results, combined with published results on aggregates of Fa(10), demonstrate that samples of Fa(30), Fa(50), Fa(75), and Fa(100) creep similar to 15, similar to 75, similar to 365, and similar to 1480 times faster than samples of Fa(10), respectively, under the same conditions. Our experimental results can be described by the flow law (epsilon) over dot = (epsilon) over dot(gbs)(0) (sigma/mu)(ngbs) (b/d)(2) X(Fa)(p) exp(-Q(gbs)(0) + alpha X(Fa)/RT) with (epsilon) over dot(gbs)(0) = (6.2 +/- 5.2) x 10(5) s(-1), n(gbs) = 3.9, p = 1.5 +/- 0.1, Q(gbs)(0) = 440 +/- 10 kJ/mol, and alpha = -45 +/- 4 kJ/mol. Based on measured dependence of strain rate on iron concentration, we conclude that, at the same thermodynamic conditions, the Martian mantle,which is more rich in Fe than Earth's mantle, will be a factor of similar to 10 less viscous than Earth's mantle. (C) 2009 Elsevier B.V. All rights reserved.; Geochemistry & Geophysics; SCI(E); EI; 23; ARTICLE; 1-2; 229-240; 287
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155934]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zhao, Yong-Hong,Zimmerman, Mark E.,Kohlstedt, David L.. Effect of iron content on the creep behavior of olivine: 1. Anhydrous conditions[J]. earth and planetary science letters,2009.
APA	Zhao, Yong-Hong,Zimmerman, Mark E.,&Kohlstedt, David L..(2009).Effect of iron content on the creep behavior of olivine: 1. Anhydrous conditions.earth and planetary science letters.
MLA	Zhao, Yong-Hong,et al."Effect of iron content on the creep behavior of olivine: 1. Anhydrous conditions".earth and planetary science letters (2009).