Results 221 to 230 of about 12,531 (254)

Assessing subglacial processes from diatom fragmentation patterns

Geology, 2004
Reconstructing the size and glacial style of past ice-sheet advances requires interpreting complex glacial sedimentary facies. We use diatoms, a major component of Antarctic continental shelf deposits, to infer the physical conditions under which these deposits were emplaced.
Reed P. Scherer, Charlotte M. Sjunneskog, Neal R. Iverson, Thomas S. Hooyer   +3 more
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Investigating Antarctic subglacial hydrologic processes from marine sediment cores

2023
Understanding processes operating beneath glacial ice is imperative for holistic knowledge of glaciated regions and for accurately projecting future behavior of and sea-level contributions from the Antarctic Ice Sheet. Evolution of subglacial hydrologic networks is one such process where knowledge gaps persist, in large part because of the challenges ...
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Characteristics of the subglacially-formed debris-rich chemical deposits and related subglacial processes of Qiangyong Glacier, Tibet

Journal of Geographical Sciences, 2003
Subglacially-formed debris-rich chemical deposits were found both on bedrock surface and in bedrock crevice on the edge of Qiangyong Glacier, one of the continental glaciers in Tibet. Grain size distribution, internal structures and chemical components of the chemical deposits were analyzed.
Luo Risheng, Cao Jun, Liu Gengnian, Cui Zhijiu   +3 more
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Microstructural interpretations of modern and Pleistocene subglacially deformed sediments: the relative role of parent material and subglacial processes

Journal of Quaternary Science, 2001
AbstractAnalysis of till micromorphology represents a relatively new technique that has been used most frequently to infer the importance of subglacial shear in till genesis. This study aims to calibrate the technique by comparing Pleistocene tills from United Kingdom with a modern till (the UpB till) from beneath Ice Stream B, West Antarctica. Despite
Anjana Khatwa, Slawek Tulaczyk
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Subglacial processes from drumlins in Clew Bay, western Ireland

Earth Surface Processes and Landforms, 2015
AbstractInterpretation of subglacial processes and environments can be usefully informed by the stratigraphy and structures of sediments preserved within drumlins, and the down‐ice variability of these sediments. Drumlins in Clew Bay, western Ireland, were formed by westward late Pleistocene ice flow onto the Atlantic shelf, but the depositional ...
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Processes and environmental significance of the subglacial chemical deposits in Tianshan Mountains

Science in China Series D: Earth Sciences, 2005
On the bedrock surface of Glacier No.1 in the headwater of Urumqi River, Tianshan Mts., well layered and crystallized subglacial calcite precipitations were discovered. Based on observations and analysis of the surface form, sedimentary texture and structure, and chemical composition of the deposits, clues about the subglacial processes and environment
Gengnian Liu, Risheng Luo, Jun Cao, Zhijiu Cui   +3 more
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Subglacial till: A physical framework for its properties and processes

Journal of Geophysical Research: Solid Earth, 1987
The continuum theory of mixtures provides a framework around which present knowledge of subglacial till can be organized. The proposed framework is provisional in two senses: the constitutive description of till will require improvement, and not all potentially significant processes have been included.
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An investigation of subglacial processes at the microscale from Briksdalsbreen, Norway

Sedimentology, 2006
AbstractThe subglacial processes at Briksdalsbreen, Norway, are examined by a combination of sedimentology, thin section and scanning electron microscope (SEM) analysis of till samples from an exposed subglacial surface and from beneath the glacier.
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Particle and aggregate mobility in till: Microscopic evidence of subglacial processes

Quaternary Science Reviews, 1997
Abstract Microscopic studies of tills show that the deforming bed of glaciers is made up of minute rotational elements or wheels, consisting of a nucleus alone or a nucleus with spiralling arms of fine grains. These fine grains can move from one wheel to the next, providing a process of high grain mobility within a deforming subglacial till ...
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An investigation of subglacial shear zone processes from Weybourne, Norfolk, UK

Quaternary Science Reviews, 2007
Abstract The glacial sediments of north Norfolk are a type site for subglacial deforming bed sediments. This investigation focussed on subglacial shear zone process at the field and thin section scale, in order to understand subglacial processes, as well as considering the implications for regional stratigraphies.
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