摘要:

The article focuses on the differences in evolution and behavior between talus‐mantled rectilinear slopes and talus cones, on the basis of field observations on Spitsbergen and in Northern Scandinavia. Whereas in the case of talus cones the talus derives from free faces above, in the case of rectilinear slopes the talus is autochthonous, the product of the weathering of the local bedrock or of resorting of till. The talus on rectilinear slopes commonly displays striking sorting and segregation: a surface layer of large slab‐shaped rocks, arranged in an imbricated fashion, rests on a layer of finer material which acts like ball‐bearings, provoking downslope movement of the larger rocks. Below this layer again lies a layer consisting of boulders embedded in a fine sandy matrix. Formation of rectilinear slopes with the arrangement just described is dependent on both lithology and climate. They are best developed and most dynamic on sedimentary rocks and in areas with continuous permafrost.

ISSN:0273-8457    

DOI:10.1080/10889378409377224

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

Over the past two decades, in no small part due to the author's efforts, considerable evidence has accumulated to indicate that a significant proportion of the total mass of the Pleistocene ice sheets lay on the continental shelves rather than on the continentsper se.This fact has extremely far‐reaching implications for the whole area of mass and energy exchange between the atmosphere, the ice sheets and the ocean and for the rate and mechanisms of ice sheet formation and disintegration. The present study represents an overview of the present state of knowledge of these “marine”; ice sheets, sitting on the continental shelves. This first part provides a survey of all such ice sheets during the Würm glaciation, in which the author examines the available evidence of the extent and thickness of such ice sheets. Particular attention is focused on the Antarctic Ice Sheet since not only were its “marine”; components more extensive during the Würm, but since the West Antarctic Ice Sheet at the present time provides valuable evidence of how such components must have behaved elsewhere during the Pleistocene.

ISSN:0273-8457    

DOI:10.1080/10889378409377225

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

ISSN:0273-8457    

DOI:10.1080/10889378409377226

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

ISSN:0273-8457    

DOI:10.1080/10889378409377223

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor