Download Glacial Sedimentary Processes and Products: Special by Michael J. Hambrey, Poul Christoffersen, Neil F. Glasser, PDF
By Michael J. Hambrey, Poul Christoffersen, Neil F. Glasser, Bryn Hubbard
Associating ice lots with the delivery and deposition of sediments has lengthy shaped a significant topic in glaciology and glacial geomorphology. the cause of this concentration is apparent, in that ice lots are chargeable for a lot of the actual panorama which characterizes the Earth's glaciated areas. This organization additionally holds at numerous scales, for instance, from the grain-size features of small-scale moraines to the structural structure of large-scale, glacigenic sedimentary sequences in either floor and subaqueous environments.This quantity brings quite a few state of the art learn contributions jointly, each one in relation to a special actual atmosphere, spatial scale, procedure or investigative procedure. the result's a various and fascinating number of papers by means of glaciologists, numerical modellers and glacial geologists, that are all associated by means of the subject of investigating the relationships among the behaviour of ice plenty and their ensuing sedimentary sequences.
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Extra resources for Glacial Sedimentary Processes and Products: Special Publication 39 of the IAS (International Association Of Sedimentologists Series)
Example text
Section S6 shows a faulted drape of clast-rich intermediate diamicton interpreted as a subglacial facies adjacent to fluvial sediments. This could indicate development in a subglacial position or an ice-marginal position by a process of meltout of an elevated subglacial facies from the ablating glacier ice (Boulton, 1972). G. Midgley et al. with restricted ablation and down-wasting of the glacier ice. Section S5 shows an absence of faulting, but includes limited folding of bedded sediments. This moraine mound is more indicative of formation in an ice-marginal position, since incorporated subglacial sediment is absent.
In the present paper, the rotary ploughing device and the experimental procedure are described in detail and preliminary results of ploughing experiments conducted using sediments from Unteraargletscher, Switzerland, are discussed. for applying a stress to the sediment normal to the ploughing direction and a drive mechanism for dragging an instrumented object through the sediment (Fig. 1A). 7 m width and 3 m height that rests on a base slab of concrete. 1 m to gear boxes and motor to external water reservoir Fig.
These values are characteristic for sediments of low compressiblity and typical for fine sands (Mitchell, 1993). in normally consolidated (NCL) and overconsolidated (OCL) states derived from tests performed with the oedometer. Two falling head permeameter tests were combined with the consolidation test at different normal stresses to determine the hydraulic conductivity k at the corresponding void ratios (see arrows in Figure 4). 32. These values are typical for tills (10−12−10−6 m s−1; Freeze & Cherry, 1979).