ISSN:0273-8457    

DOI:10.1080/10889379209377469

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

ISSN:0273-8457    

DOI:10.1080/10889379209377470

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

ISSN:0273-8457    

DOI:10.1080/10889379209377471

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

On the basis of a systems analysis of the end moraines and indicators of ice flow, the authors contend that the northern margins of Eurasia, including the arctic continental shelves, were entirely and repeatedly glaciated by vast marine ice sheets during the Pleistocene ice ages. All available information on late Pleistocene ice‐marginal features was included in a numerical reconstruction of a three‐dimensional model of the Eurasian Ice Sheet. This reconstruction suggested that the ice sheet was formed by the merging of three major ice domes (the Scandinavian, Kara, and East Siberian domes) and one lesser one (the Chukchi dome). These domes covered respectively 3.4, 6.1, 2.3, and 0.4 million km2, and the total areal extent of the ice sheet was 12.2 million km2. A further 2 million km2was covered by mountain glacier complexes, and no less than 3 million km2was inundated beneath proglacial lakes. According to different determinations, the volume of the last Eurasian Ice Sheet was about 15 to 18 million km3, while an additional mass of ice was incorporated in a floating ice shelf covering the Arctic Basin, 1 to 1.5 km thick. These facts are critical for understanding the geomorphology, sedimentology, hydrochemistry, and physics of the Arctic Ocean. Glacial scouring and glaciomarine deposition may account for the structure of the arctic continental shelf and slope and for the huge accumulations of sediment on the sea bed. Some other features of the ocean seem to have resulted from the impact of the floating ice shelf. This should all be taken into account by future arctic research expeditions.

ISSN:0273-8457    

DOI:10.1080/10889379209377472

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

ISSN:0273-8457    

DOI:10.1080/10889379209377473

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Glaciers in the little‐known region of the Tenianyy Range, Chukotka, are described on the basis of field work carried out in August 1988. The equilibrium line on these glaciers lies at about 500 m; accumulation averages about 190 g/cm2. The glaciers occupy steep cirque slopes and are heavily covered with debris. No crevasses have been detected. Due to an unusual distribution of snow on the surfaces of the glaciers, whereby it tends to accumulate on the lower parts, the ice in the upper portions of these glaciers is free of snow; this results in thinning and gradual disappearance of the ice in the upper parts. All the glaciers are in a stage of degradation. Snow patches are widespread in the region. It is concluded that present conditions are inimical to glacier formation and survival in the Tenianyy Range.

ISSN:0273-8457    

DOI:10.1080/10889379209377474

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The Quaternary sequence filling the Malyk‐Sien basin includes beds of diaraicton sediments and ground ice bodies. Some specialists consider the ice bodies enclosed in these diamicton deposits to be fossil glacier ice and the icy sediments to be till. But the observed bedding (oblique in some places), traces of displacement, signs of displacements in mud flows, and inclusions of wood and peat provide evidence of a deluvial‐solifluction origin for these deposits. The sorting and bedding of sand‐and‐clay intercalations in the ice, as well as inclusions of organic material exclude the idea that they were formed by moving ice. Rather, they are evidence that they originated under the influence of moving water. The “folds”; sometimes occurring in the sand‐and‐clay intercalations represent the tracks of tiny trickles of water, depositing fine material during the ocurse of ice formation. The data on the chemical composition reveal that it is similar in composition to the surface and ground water of the area, and clearly distinct from that of the glacier ice in the nearest mountain massif. It is concluded that the ground ice in the region in question represents bodies of accumulative ice, ice wedges, buried river ice, and aafeis.

ISSN:0273-8457    

DOI:10.1080/10889379209377475

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The study comprises an investigation of the Shackleton Range (which is a part of the East Antarctic craton) by two geologists affiliated with the Russian Academy of Sciences in St. Petersburg. It is focused on thermodynamic conditions of metamorphism and includes an analysis of fluid characteristics based on the cryometric method. The detected presence of slightly mineralized salt‐water inclusions in quartz provided new evidence suggesting a crustal nature of the fluid and an isochemical nature of the metamorphism.

ISSN:0273-8457    

DOI:10.1080/10889379209377476

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Pier Horensma.The Soviet Arctic.London and New York: Routledge, 1991. xi and 228 pp., maps, appendix, glossary, and bibliography. $97.00 cloth (reviewed by Gail Fondahl, Institute of Arctic Studies, Dartmouth College).

ISSN:0273-8457    

DOI:10.1080/10889379209377477

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

ISSN:0273-8457    

DOI:10.1080/10889379209377468

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor