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Glacimarine environments : processes and sediments (1990)

Geological Society

London : Geological Society

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Schlagwort(e): Konferenzschrift 1989 ; Konferenzschrift ; Meer ; Treibeis ; Glaziales Sediment ; Meeressediment ; Meereis ; Sediment ; Sedimenttransport ; Meer ; Treibeis ; Glaziales Sediment ; Meeressediment ; Meereis ; Sediment ; Sedimenttransport ; Glaziales Sediment ; Glaziomarine Sedimentation

Materialart: Buch

Seiten: VII, 423 S. , Ill., graph. Darst., Kt.

Ausgabe: 1. publ.

ISBN: 0903317540

Serie: Special publication / Geological Society 53

URL: https://www.gbv.de/dms/tib-ub-hannover/025365533.pdf

DDC: 551.46083

RVK:

RB 10372

Sprache: Englisch

Anmerkung: Includes bibliographical references and indexes

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Glacier-influenced sedimentation on high-latitude continental margins (2002)

Dowdeswell, Julian A. ; Ó Cofaigh, C. ; Meeting 2001.

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Schlagwort(e): Drift Congresses ; Glacial landforms Congresses ; Sedimentation and deposition Congresses ; Continental margins Congresses ; Aufsatzsammlung ; Kontinentalrand ; Glaziallandschaft ; Glaziomarine Sedimentation ; Glazialmorphologie ; Glaziales Sediment ; Sedimentation ; Stratigraphie ; Arktis ; Gletscher

Materialart: Online-Ressource

Seiten: 1 Online-Ressource (VI, 378 Seiten)

ISBN: 1862391203

Serie: Geological Society special publication 203

URL: http://sp.lyellcollection.org/content/203/1

URL: https://external.dandelon.com/download/attachments/dandelon/ids/DE0119C9D580F59237424C125738A002C3A83.pdf

DDC: 551.313

RVK:

TF 7300

Sprache: Englisch

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Atlas of submarine glacial landforms : modern, Quaternary and ancient / edited by J.A. Dowdeswell (University of Cambridge, UK), M. Canals (University of Barcelona, Spain), M. Jakobsson, Stockholm University, Sweden), B.J. Todd (Geological Survey of Canada, Canada), E.K. Dowdesweell (University of Cambridge, UK) and K.A. Hogan (British Antarctic Survey, UK) (2016)

Dowdeswell, Julian A. ; Canals, Miquel 1957- ; Jakobsson, Martin ; [weitere]

London : Geological Society

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Schlagwort(e): Aufsatzsammlung ; Nordpolarmeer ; Glaziomarine Sedimentation ; Meeressediment ; Sedimentation ; Meeresboden ; Aufsatzsammlung ; Fjord ; Meeresgeologie ; Meeressediment ; Glaziomarines Sediment ; Erosion ; Antarktis ; Arktis ; Südpolarmeer ; Geomorphogenese ; Glazialerosion ; Glazialmorphologie ; Meeresgeologie ; Paläogeomorphologie

Materialart: Online-Ressource

Seiten: 1 Online-Ressource

Serie: Geological Society Memoirs 46

URL: http://mem.lyellcollection.org/content/46/1

DOI: 10.1144/M46

DDC: 551.31509168

RVK:

RY 20295

Sprache: Englisch

Anmerkung: Dateiformat Volltext: PDF, abstracts

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Glacimarine environments : processes and sediments ; papers (1990)

Geological Society

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Schlagwort(e): Konferenzschrift ; Meer ; Treibeis ; Glaziales Sediment ; Meeressediment ; Meereis ; Sediment ; Sedimenttransport ; Glaziales Sediment ; Glaziomarine Sedimentation

Materialart: Online-Ressource

Seiten: 1 Online-Ressource (423 Seiten)

Serie: Geological Society special publication 53

URL: http://sp.lyellcollection.org/content/53/1

DDC: 551.46083

RVK:

RB 10372

Sprache: Englisch

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Buch

Atlas of submarine glacial landforms: modern, Quaternary and ancient (2016)

Dowdeswell, Julian A. ; Canals, Miquel 1957- ; Jakobsson, Martin ; [weitere]

London : The Geological Society

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Schlagwort(e): Glacial landforms ; Submarine topography ; Meeresboden ; Glaziallandschaft ; Glaziales Sediment

Beschreibung / Inhaltsverzeichnis: "The Atlas presents over 180 contributions describing, illustrating and discussing the full variability of landforms found on the high-latitude glacier-influenced seafloor, from fjords and continental shelves to the continental slope, rise and deep-sea basins beyond."--

Materialart: Buch

Seiten: xix, 618 Seiten , Karten, Diagramme, Illustrationen , 32 cm

ISBN: 9781786202680

Serie: Geological Society memoir No. 46

URL: http://mem.lyellcollection.org/content/46/1.toc

DDC: 551.31509168

RVK:

RY 20295

Sprache: Englisch

Anmerkung: Cumulated bibliography pages [575] - 611 , Geographical index pages [612] - 614 , Introduction -- Acoustic methods -- Fjords: landforms -- Fjords: landform assemblages -- Continental shelf: landforms -- Continental shelf: landform assemblages -- Continental slope: landforms -- Fjord-shelf-slope: landsystems -- Conclusion -- Glossary, cumulated bibliography and index

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The origin of massive diamicton facies by iceberg rafting and scouring, Scoresby Sund, East Greenland (1994)

DOWDESWELL, JULIAN A. ; WHITTINGTON, ROBERT J. ; MARIENFELD, PETER

Oxford, UK : Blackwell Publishing Ltd

Sedimentology 41 (1994), S. 0

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ISSN: 1365-3091

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Geologie und Paläontologie

Notizen: Almost 90% of 39 m of core material recovered from Scoresby Sund and the adjacent East Greenland shelf is massive diamicton, interpreted to be formed predominantly by the release of iceberg rafted debris and reworking by iceberg scouring. There is also likely to be a contribution from suspension settling of fines derived from glaciofluvial sources. Model calculations suggest that the 14C derived Holocene sedimentation rate of 0.1-0.3 m 1000 yr−1 in Scoresby Sund can be accounted for mainly by iceberg rafting of debris. A further 4% of core material is of gravel or coarse sand lenses, interpreted to reflect iceberg dumping of debris. Intensive iceberg scouring, which reworks sea floor sediments, is observed on acoustic records from over 30 000 km2 of the Scoresby Sund fiord system and the adjacent East Greenland shelf (69-72°N and 75°N). The rate of iceberg production from Greenland Ice Sheet outlet glaciers, and iceberg drift tracks on the shelf, suggests that iceberg rafting and scouring may be important over a significant proportion of the 500 000 km2 area above the shelf break. The relatively extensive modern occurrence of massive diamicton, formed by iceberg rafting and scouring, together with suspension settling of fines, suggests that it may also be a significant facies in the glacier-influenced geological record. The recognition in the geological record of the massive diamicton facies described above may also indicate the former presence of fast flowing ice sheet outlet glaciers.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1365-3091.1994.tb01390.x

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Quartz sand grain shape and other criteria used to distinguish glacial and non-glacial events in a marine core from Frobisher Bay, Baffin Island, N.W.T., Canada (1985)

DOWDESWELL, JULIAN A. ; OSTERMAN, LISA E. ; ANDREWS, JOHN T.

Oxford, UK : Blackwell Publishing Ltd

Sedimentology 32 (1985), S. 0

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ISSN: 1365-3091

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Geologie und Paläontologie

Notizen: Analyses of quartz sand grain shape, sediment influx rates and foraminifera define glacial and non-glacial episodes in a 9.69 m core from Frobisher Bay, Arctic Canada. Five radiocarbon dates on organic matter provide a preliminary core chronology, with a basal date of 11,910 yr BP. Quartz sand grain morphology is measured for samples at seven core levels using: (1) Fourier shape analysis; (2) percentage of grain surface conchoidally fractured. Samples at 2.0 and 7.5 m are most fractured and have Fourier roughness coefficients similar to particles sampled directly from glacier ice. These two samples probably represent glacial events in the core. Major intervals of non-carbonate sand influx occur at 9.0–4.5 m and 3.5–1.5 m, separated by several thousand years of slower sedimentation. Detrital carbonate influx rates are relatively high prior to 4.3 m, then decline rapidly indicating a shift in sediment provenance from limestones flooring Frobisher Bay to rafting from far-travelled icebergs. Bio- and lithostratigraphic analysis allows definition of five core units: (1) an environment similar to today below 8.5 m; (2) glacial conditions from 8.5–6.8 m, associated with ice proximal to the core site; (3) ameliorating conditions from 6.8 to 3.2 m; (4) cooler conditions from 3.2 to 0.5 m, probably related to increased iceberg flux rather than neoglacial advances of nearby ice caps; (5) an environment similar to today from 0.5 m. Sand grains sampled at 7.5 and 2.0 m, whose shapes indicate they are derived from glacier ice, lie within the cooler or glacial units defined from foraminiferal analysis. This indicates that quantitative measurement of particle surface morphology can provide useful environmental information in studies of marine cores.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1365-3091.1985.tb00496.x

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Characterization of pebble fabrics in modern terrestrial glacigenic sediments (1986)

DOWDESWELL, JULIAN A. ; SHARP, MARTIN J.

Oxford, UK : Blackwell Publishing Ltd

Sedimentology 33 (1986), S. 0

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ISSN: 1365-3091

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Geologie und Paläontologie

Notizen: Pebble fabric data are available from several facies of glacigenic sediments deposited by modern glaciers, where sedimentary processes can be observed or inferred with relatively little ambiguity. Over 100 samples from contemporary environments illustrate fabrics characterizing melt-out till, deformed and undeformed lodgement till, sediment flow deposits and ice slope colluvium. Lodgement till fabric variability is related to the two-layer structure of these sediments; a structureless, friable upper layer with low shear strength and high consolidation coefficient, overlying a very compact material of horizontal platy structure. Fabric strength (assessed by eigenvalue analysis) is weaker and pebble dip is more dispersed in the upper structureless horizon. Stronger fabrics in the lower platy horizon may be primary depositional fabrics which are destroyed by subglacial shearing to give weaker fabrics in the upper horizon. Alternatively, upper horizon fabrics may be characteristic of all recently-deposited lodgement tills, with stronger fabrics developing at depth by dewatering and consolidation. There is a general reduction in fabric strength and an increase in particle dip associated with the transition from melt-out tills, through undeformed and deformed lodgement tills, to sediment flow deposits and ice slope colluvium. There is, however, considerable overlap in the fabric strengths characteristic of sediment flow deposits and deformed lodgement tills. Fabric data from modern glacial sedimentary facies are used to assist in interpreting the mode of deposition of some Quaternary glacial sediments. Relatively strong fabrics characteristic of melt-out tills and undeformed lodgement tills are more likely to be diagnostic of genesis than weaker fabrics associated with deformed sediments.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1365-3091.1986.tb01970.x

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A surge of Perseibreen, Svalbard, examined using aerial photography and ASTER high resolution satellite imagery (2003)

Dowdeswell, Julian A. ; Benham, Toby J.

Oxford, UK : Blackwell Publishing Ltd

Polar research 22 (2003), S. 0

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ISSN: 1751-8369

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Geographie , Geologie und Paläontologie

Notizen: The identification of surge activity is important in assessing the duration of the active and quiescent phases of the surge cycle of Svalbard glaciers. Satellite and aerial photographic images are used to identify and describe the form and flow of Perseibreen, a valley glacier of 59 km2 on the east coast of Spitsbergen. Heavy surface crevassing and a steep ice front, indicative of surge activity, were first observed on Perseibreen in April 2002. Examination of high resolution (15 m) Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) satellite imagery confirmed this surge activity. Perseibreen retreated by almost 750 m between 1961 and 1990. Between 1990 and the summer of 2000, Perseibreen switched from retreat and its front began to advance. Rapid advance was underway during the period June 2000 to May 2001, with terminus advance at over 400 m yr−1. Between May and August 2001 the rate increased to over 750 m yr−1. The observed crevasse orientation indicates that ice was in longitudinal tension, suggesting the down-glacier transfer of mass. Ice surface velocities, derived from image correlation between ASTER images, were 2-2.5 m d−1 between May and August 2001. The glacier was flowing at a relatively uniform speed with sharp velocity gradients located close to its lateral margins, a velocity structure typical of ice masses in the active phase of the surge cycle. The stress regime is extensional throughout and the surge appears to be initiated low on the glacier. This is similar to the active-phase dynamics of other Svalbard tidewater glaciers. Perseibreen has probably been inactive since at least 1870, a period of about 130 years to the present surge which defines a minimum length for the quiescent phase.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1751-8369.2003.tb00118.x

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Mapping seabird nesting habitats in Franz Josef Land, Russian High Arctic, using digital Landsat Thematic Mapper imagery (1998)

WILLIAMS, MEREDITH ; DOWDESWELL, JULIAN A.

Oxford, UK : Blackwell Publishing Ltd

Polar research 17 (1998), S. 0

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ISSN: 1751-8369

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Geographie , Geologie und Paläontologie

Notizen: Supervised classification of digital Landsat satellite images was used to locate seabird nesting habitats in the Russian High Arctic archipelago of Franz Josef Land, a region where the avifauna is poorly known and ecologically vulnerable. Major seabird nesting colonies are readily identifiable in Landsat Thematic Mapper (TM) imagery of the region due primarily to the distinctive spectral signature of vegetation on ornithogenically altered soils below bird cliffs. Supervised image classification was used to pinpoint areas displaying spectral characteristics typical of documented seabird nesting habitats. A total of 101 seabird nesting colony locations identified in Russian and Western literature from 1898 to 1996 was used as training sites to develop spectral signatures from a summer TM image mosaic for use in a supervised maximum likelihood classification. The classified image was thresholded and compared to a map of documented nesting locations. Of the 101 field-documented nesting sites, 96 were clearly identified in the classified image. An inventory was produced of all undocumented seabird habitats suggested by the classification, totalling over 300 sites. The methodology used may be applicable to other arctic regions and is intended as a first step when planning ecological protection zones in remote and inaccessible arctic regions.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1751-8369.1998.tb00256.x

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