Glacial Deposits

Glacial Deposits

 

geological deposits whose formation is genetically related to modern or ancient mountain glaciers or continental ice caps. Glacial deposits are divided into glacial deposits proper (or moraine) and aqueoglacial deposits.

Glacial deposits proper arise when fragmentai material carried within the glacier is directly deposited beneath the glacier. These deposits are composed of unsorted loose fragmentai rock, more often boulder clay, loams, and sandy loams and, more rarely, boulder sands and coarse gravel containing boulders, rock debris, and pebbles.

Aqueoglacial deposits are formed inside and along the periphery of glaciers from sorted morainic material that has been redeposited by meltwaters. Among these deposits a distinction is made between glaciofluvial deposits, which are the deposits of streams of meltwater (obliquely bedded sands, gravel, and shingle), and glaciolacustrine deposits of englacial and periglacial lakes (predominantly varved clays).

All types of glacial deposits form complicated combinations (glacial complexes or glacial formations). They are particularly characteristic for the youngest Anthropogene system, during whose formation extensive continental glaciers covered enormous areas in the present-day temperate zones. Among the deposits of the Upper Paleozoic, the Ordovician, and the Pre-cambrian, ancient glacial deposits are also known; they are usually greatly consolidated, cemented together, and sometimes also metamorphosed (tillites).

REFERENCE

Shantser, E. V. Ocherki ucheniia o geneticheskikh tipakh kontinental’-nykh osadochnykh obrazovanii. Moscow, 1966.

E. V. SHANTSER

References in periodicals archive ?
Radon typically is associated with fractured igneous and meta-igneous rocks, clay-rich glacial deposits, marine shale, carbonate soils, and uranium-bearing river and marine sediments (Gundersen et al.
This was done through a spatial study of the Asylum Lake property composed of two data runs with station spacing of 100-25 meters to help determine bed rock depths and thickness of the overlying glacial deposits.
It consists of Diamictite glacial deposits (TBI), wash out plain deposits (TB2) and followed by subaqueous Diamictite facies (TB3).
To the south, the River Wiske once flowed into the Tees, but was diverted by glacial deposits and now flows south into the Swale.
Later, as we glide through seemingly bottomless waters, the brilliance of the sky matches the blueness of the pools on our decks, and narrow inlets shine green with glacial deposits.
During construction, quality control was key and Mr Ericsson travelled to watch the excavation of the glacial deposits near Tamworth which would create the final exposed concrete to ensure consistency and colour.
Scientists have suggested that over 6,000 years ago, a sharp sea-level rise, attributed to a changing climate and a rapid melting of ice, added weight to the submarine glacial deposits at the edge of the Norwegian continental shelf, destabilising them and causing a 300km long landslide.
Flying at 90 metres, aircraft use technology to see through Ireland's deep glacial deposits and peat cover.
The Llandovery with its proven glacial deposits (Grahn & Caputo 1992; Caputo 1998; Diaz-Martinez & Grahn 2007), and therefore proven glacially induced sea-level fluctuations (Johnson 2006, 2010; Munnecke et al.
The grapes are grown on glacial deposits to the south of Lake d''Iseo in the heart of Lombardy and can be a mix of chardonnay, pinot noir and pinot bianco although chardonnay dominates.
If you look at SAS's land package from Matheson east to the Quebec border, it is very underexplored due to the topography of the area: huge glacial deposits of overburden with sand and alluvial sitting on top.