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Record #164679:

Subglacial deformation: evidence from microfabric studies of particles and voids in till from the upper Ürümqi river valley, Tien Shan, China / Chaolu Yi, Zhijiu Cui.

Title: Subglacial deformation: evidence from microfabric studies of particles and voids in till from the upper Ürümqi river valley, Tien Shan, China / Chaolu Yi, Zhijiu Cui.
Author(s): Yi, Chaolu.
Cui, Zhijiu.
Date: 2001.
In: Journal of Glaciology. (2001.), Vol. 47(159) (2001)
Abstract: Deals with microfabrics in till caused by subglacial deformation. Examines fabrics formed by flat particles, 0.25-5.0 mm in diameter with aspect ratios ranging from 1:2 to 1:4 and, for the first time, considers the microfabric formed by elongate microscopic voids. Uses microfabrics to determine whether till has bean sheared subglacially. Describes sampling sites, which include moraines, roches moutonnées and drumlins. Deposits sampled ranged in date from Wangfeng glaciation (19-21 kyr B.P.) to 1960s. Describes impregnation of samples with cyanoacrylate glue for transport and subsequent sectioning for analysis. Presents rose diagrams of till fabrics and statistics of grain orientations. Discusses interpreting 3-D fabric from planar thin sections. Presents field evidence that those tills with strong particle and void microfabrics have undergone subglacial deformation. Fabrics on stoss side of two roches moutonnées and a drumlin are strong, but those on lee sides are weak, suggesting the till here was not sheared significantly.
Notes:

Journal of Glaciology. Vol. 47(159) :607-612 (2001).

Keywords: 551.33 -- Glacial geology.
551.333.2 -- Glacial substrate, deformation structures in.
551.331.5 -- Glacial erosion and protection. Sub-glacial topography.
551.332.21 -- Till or boulder clay. Tillite. Glacial diamictites.
E7 -- Glaciology: glacial geology and ice ages.
(510) -- People's Republic of China.
(235.21) -- Hindu Kush and Tien Shan.
SPRI record no.: 164679

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500 ## ‡aJournal of Glaciology. Vol. 47(159) :607-612 (2001).
520 3# ‡aDeals with microfabrics in till caused by subglacial deformation. Examines fabrics formed by flat particles, 0.25-5.0 mm in diameter with aspect ratios ranging from 1:2 to 1:4 and, for the first time, considers the microfabric formed by elongate microscopic voids. Uses microfabrics to determine whether till has bean sheared subglacially. Describes sampling sites, which include moraines, roches moutonnées and drumlins. Deposits sampled ranged in date from Wangfeng glaciation (19-21 kyr B.P.) to 1960s. Describes impregnation of samples with cyanoacrylate glue for transport and subsequent sectioning for analysis. Presents rose diagrams of till fabrics and statistics of grain orientations. Discusses interpreting 3-D fabric from planar thin sections. Presents field evidence that those tills with strong particle and void microfabrics have undergone subglacial deformation. Fabrics on stoss side of two roches moutonnées and a drumlin are strong, but those on lee sides are weak, suggesting the till here was not sheared significantly.
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650 07 ‡a551.333.2 -- Glacial substrate, deformation structures in.‡2udc
650 07 ‡a551.331.5 -- Glacial erosion and protection. Sub-glacial topography.‡2udc
650 07 ‡a551.332.21 -- Till or boulder clay. Tillite. Glacial diamictites.‡2udc
650 07 ‡aE7 -- Glaciology: glacial geology and ice ages.‡2local
651 #7 ‡a(510) -- People's Republic of China.‡2udc
651 #7 ‡a(235.21) -- Hindu Kush and Tien Shan.‡2udc
700 1# ‡aCui, Zhijiu.
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