Inhibition of Grain Boundary Sliding in Fine-Grained Ice by Intergranular Particles: Implications for Planetary Ice Masses

doi:10.1029/2018GL080228

	Inhibition of Grain Boundary Sliding in Fine-Grained Ice by Intergranular Particles: Implications for Planetary Ice Masses
	Qi, Chao 1,2; Stern, Laura A.3; Pathare, Asmin 4; Durham, William B.5; Goldsby, David L.1
刊名	GEOPHYSICAL RESEARCH LETTERS
	2018-12-16
卷号	45 期号:23 页码:12757-12765
ISSN号	0094-8276
DOI	10.1029/2018GL080228
英文摘要	Ice in both terrestrial and planetary settings often contains rock particles. Here we present an experimental investigation of the influence of intergranular particles on the rheological behavior of ice. Experiments were performed on samples fabricated from 10-mu m ice powders + 1-mu m graphite or 0.8-mu m alumina particles and subjected to elevated confining pressures. A critical particle fraction, similar to 6%, was observed, below which samples behave like pure ice and deform by both grain boundary sliding (GBS) and dislocation creep, and above which GBS creep is impeded. Above this critical fraction, ice grains occur in particle-free clusters surrounded by bands of particles mixed with fine-grained ice, resulting in the impedance of GBS in the bands as well as sliding between the ice clusters. Our results imply that South Polar Layered Deposits and midlatitude lobate debris aprons on Mars must contain > 94% ice and that the shallow subsurface of Ceres could contain > 90% ice. Plain Language Summary Ice on Mars, Ceres, and icy satellites often contains rock particles. The presence of particles in ice changes its flow behavior and thus is important for understanding the composition and evolution of planetary ice masses. Based on laboratory experiments on samples made of fine-grained ice and intergranular particles, we determined a critical quantity of particles, about 6% by volume, below which the ice-particle samples flow like pure ice, and above which, sliding between grains (so-called grain boundary sliding, or GBS) is impeded. The impedance of GBS by particles has not previously been observed. At planetary conditions, GBS is often the dominant flow mechanism for pure ice. Our result thus imply that the South Polar Layered Deposits and midlatitude lobate debris aprons on Mars must contain > 94% ice and that the shallow subsurface of Ceres could contain more than 90% ice.
资助项目	NASA Solar System Workings program[NNX15AM69G]
WOS关键词	INTERNAL STRUCTURE ; DEFORMATION ; RHEOLOGY ; EVOLUTION ; CONSTRAINTS ; VISCOSITY ; MIXTURES ; MARS
WOS研究方向	Geology
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000454296600013
资助机构	NASA Solar System Workings program ; NASA Solar System Workings program ; NASA Solar System Workings program ; NASA Solar System Workings program ; NASA Solar System Workings program ; NASA Solar System Workings program ; NASA Solar System Workings program ; NASA Solar System Workings program
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/90250]
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 Penn, Dept Earth & Environm Sci, Philadelphia, PA 19104 USA 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China 3.US Geol Survey, 345 Middlefield Rd, Menlo Pk, CA 94025 USA 4.Planetary Sci Inst, Tucson, AZ USA 5.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA
推荐引用方式 GB/T 7714	Qi, Chao,Stern, Laura A.,Pathare, Asmin,et al. Inhibition of Grain Boundary Sliding in Fine-Grained Ice by Intergranular Particles: Implications for Planetary Ice Masses[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(23):12757-12765.
APA	Qi, Chao,Stern, Laura A.,Pathare, Asmin,Durham, William B.,&Goldsby, David L..(2018).Inhibition of Grain Boundary Sliding in Fine-Grained Ice by Intergranular Particles: Implications for Planetary Ice Masses.GEOPHYSICAL RESEARCH LETTERS,45(23),12757-12765.
MLA	Qi, Chao,et al."Inhibition of Grain Boundary Sliding in Fine-Grained Ice by Intergranular Particles: Implications for Planetary Ice Masses".GEOPHYSICAL RESEARCH LETTERS 45.23(2018):12757-12765.