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Glacial geomorphology and glacial lakes of central Transbaikalia, Siberia, Russia
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology. (Paleoglaciology)
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology. (Paleoglaciology)
2011 (English)In: Journal of Maps, ISSN 1744-5647, 18-30 p.Article in journal (Refereed) Published
Abstract [en]

A glacial geomorphological map is presented covering the poorly investigated mountainous region ofcentral Transbaikalia, Russia. Interpretation of geomorphology is achieved using remotely sensed data (SRTM digital elevation model, Landsat 7 ETM+ satellite imagery and Google Maps). Glacially modified terrain is mapped together with moraines, glacial lineations and meltwater channels, in order to provide an estimate of the area affected by glaciation. The glacial landform record varies across the mapped region implying that the character of glaciation was not uniform in the area. Several moraine generations occur in the main valleys and at some places glaciers blocked the drainage routes, which resulted in the formation of glacial lakes. The largest, Glacial Lake Vitim, was dammed by a glacier lobe blocking the Vitim valley in the Kodar Range. A distinct fossil shoreline of Glacial Lake Vitim occurs along a substantial part of the former shore at a level of 840 m a.s.l. A col through which the lake drained to the River Nercha occurs at an elevation consistent with the shoreline level of 840 m a.s.l. The existence of another glacial lake in the Chara basin is inferred from mapped delta surfaces and a probable blockage of the Chara River by advancing valley glaciers. The rich and diverse geomorphology and the sedimentary record of glacial lakes represent a potential for more detailed studies of the glacial and climate history of this remote region.

Place, publisher, year, edition, pages
2011. 18-30 p.
National Category
Physical Geography
Research subject
Physical Geography
Identifiers
URN: urn:nbn:se:su:diva-67383DOI: 10.4113/jom.2011.1132ISI: 000290233500003OAI: oai:DiVA.org:su-67383DiVA: diva2:470104
Note
authorCount :2Available from: 2011-12-28 Created: 2011-12-28 Last updated: 2012-01-09Bibliographically approved
In thesis
1. Retreat pattern and dynamics of glaciers and ice sheets: reconstructions based on meltwater features
Open this publication in new window or tab >>Retreat pattern and dynamics of glaciers and ice sheets: reconstructions based on meltwater features
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Glaciers and ice sheets covered extensive areas in the Northern Hemisphere during the last glacial period. Subsequently to the Last Glacial Maximum (LGM), they retreated rapidly and, except for Greenland and some other ice caps and glaciers, they vanished after the last glacial termination. This thesis examines the dynamics of deglacial environments by analysing the glacial geomorphological record with focus on the landforms created by glacial meltwater. The aims are (i) to evaluate the data available for mapping glacial meltwater features at the regional scale, and (ii) to demonstrate the potential of such features for regional ice retreat reconstructions in high-relief landscapes. Meltwater landforms such as ice-marginal meltwater channels, eskers, deltas and fossil glacial lake shorelines are used to infer former ice surface slope directions and successive positions of retreating ice margins.

Evaluated high-resolution satellite imagery and digital elevation models reveal their potential to replace aerial photographs as the primary data for mapping glacial meltwater landforms. Following a methods study, reconstructions of the deglacial dynamics are carried out for central Transbaikalia, Siberia, Russia, and for the Cordilleran Ice Sheet (CIS) in central British Columbia, Canada, using regional geomorphological mapping surveys.

Mapped glacial landforms in central Transbaikalia show evidence of a significant glaciation that possibly extended beyond the high mountain areas. Large glacial lakes were formed as advancing glaciers blocked rivers, and of these, Glacial Lake Vitim was the most prominent.

Deglacial dynamics of the CIS reveals that the ice divide shifted to the Coast Mountains in north-central British Columbia and the eastern ice margin retreated towards the ice divide in late glacial time.

This thesis demonstrates the potential to reconstruct ice retreat patterns and deglacial dynamics at regional scales by interpretation of the meltwater landform record.

Place, publisher, year, edition, pages
Stockholm: Department of Physical Geography and Quaternary Geology, Stockholm University, 2012. 17 p.
Series
Dissertations from the Department of Physical Geography and Quaternary Geology, ISSN 1653-7211 ; 30
Keyword
Palaeoglaciology, Cordilleran Ice Sheet, deglaciation, glacial meltwater features, glacial lake
National Category
Physical Geography
Research subject
Physical Geography
Identifiers
urn:nbn:se:su:diva-68958 (URN)978-91-7447-429-9 (ISBN)
Public defence
2012-02-10, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 13:00 (English)
Opponent
Supervisors
Note
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 5: Submitted. Paper 6: Manuscript. Available from: 2012-01-19 Created: 2012-01-09 Last updated: 2012-01-09Bibliographically approved

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