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Genetic Classification of Till

Alekšis Dreimanis
AD

Membre a labase

Alekšis Dreimanis

Résumé du colloque

Till, by definition, is a glacial sediment but its classification is complex and controversial for the following reasons: 1) till is a polygenetic sediment since most of its varieties, with one exception (subnination till), require melting of ice, to be deposited, or even formed and deposited; 2) several genetic varieties of till may be deposited simultaneously within a single stratigraphic unit: both at different levels, as well as laterally; 3) the commonly known varieties of till, lodgement, melt-out, deformation till and gravity flowtill (glacier-related sediment flow deposit of some authors) are related members in a continuum of many combinations, that may be graphically represented by an inverted tetrahedron (see figure). The genetic varieties of till, either end members or their combinations, may be distinguished by detailed investigations and application of a combination of multiple criteria that are related to the processes of their formation and deposition. Pre-depositional glacial transport (supraglacial, englacial, basal in ice, or by subsole drag) also has to be considered.

Contexte

Section :
Analyse des faciès glaciaires : méthodologie
news icon Thème du colloque :
Analyse des faciès glaciaires : méthodologie
host icon Hôte : Université du Québec à Montréal

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Titre du colloque :

Analyse des faciès glaciaires : méthodologie
La provenance du till, une notion indispensable à l'analyse stratigraphique et l'interprétation géo…
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Depositional Processes and Environmental Factors of Glacigenic Sedimentary Sequences
Daniel E. Lawson
Genetic Classification of Till
Alekšis Dreimanis
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Thème du colloque :

Analyse des faciès glaciaires : méthodologie
Genetic Classification of Till
Alekšis Dreimanis