Subglacial deformation: evidence from microfabric studies of particles and voids in till from the upper Urumqi river valley, Tien Shan, China

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	Subglacial deformation: evidence from microfabric studies of particles and voids in till from the upper Urumqi river valley, Tien Shan, China
	Yi, C. L. ; Cui, Z. J.
刊名	Journal of Glaciology
	2001
期号	159 页码:607-612
中文摘要	Microfabrics formed by flat particles and voids in till samples from the upper Urumqi river valley, Tien Shan, northwestern China, were analyzed using three mutually perpendicular thin sections. Chi-squared tests were used to determine significance levels of the orientations of both particles and voids. The basal tills in an end moraine, on the stoss sides of two roche moutonnees, on the stoss sides of a drumlin with a rock core, and on the lee side of the same drumlin far from the rock core have strong particle and void microfabrics. Field evidence suggests that these tills were deformed in a subglacial setting. Thus, consistent with recent laboratory studies of till fabric development, deformation is believed to be responsible for the strong particle and void microfabrics. in the same end moraine, particle microfabrics in an overlying till were strong, but void microfabrics were weak. This till is believed to have been foamed by dumping and rolling of debris from hill slopes and of ablation moraine from the glacier surface. The weak void microfabric is interpreted to indicate that the till was not consolidated and hence not sheared under the weight of the glacier, despite the strong particle microfabric. Basal tills on the lee sides of the roche moutonnees, and on the lee side of the drumlin but near its core, have weak microfabrics.
原文出处	://WOS:000175252600009
公开日期	2012-04-11
内容类型	期刊论文
源URL	[http://ir.whigg.ac.cn/handle/342008/3449]
专题	测量与地球物理研究所_其他_期刊论文
推荐引用方式 GB/T 7714	Yi, C. L.,Cui, Z. J.. Subglacial deformation: evidence from microfabric studies of particles and voids in till from the upper Urumqi river valley, Tien Shan, China[J]. Journal of Glaciology,2001(159):607-612.
APA	Yi, C. L.,&Cui, Z. J..(2001).Subglacial deformation: evidence from microfabric studies of particles and voids in till from the upper Urumqi river valley, Tien Shan, China.Journal of Glaciology(159),607-612.
MLA	Yi, C. L.,et al."Subglacial deformation: evidence from microfabric studies of particles and voids in till from the upper Urumqi river valley, Tien Shan, China".Journal of Glaciology .159(2001):607-612.