Open AccessThe origin of glacial rafts: detachment, transport, deposition
Author(s) -
RUSZCZYŃSKASZENAJCH HANNA
Publication year - 1987
Publication title -
boreas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.95
H-Index - 74
eISSN - 1502-3885
pISSN - 0300-9483
DOI - 10.1111/j.1502-3885.1987.tb00761.x
Subject(s) - glacial period , geology , glacier , moraine , raft , deposition (geology) , geomorphology , materials science , sediment , composite material , copolymer , polymer
Ruszczyńska‐Szenajch, Hanna 1987 06 01: The origin of glacial rafts: detachment, transport, deposition. Boreas , Vol. 16, pp. 101–112. Oslo. ISSN 0300–9483. Characteristics of the processes of detachment and transport of glacial rafts and some aspects of the process of raft deposition are considered for two main genetic groups: (1) glaciotectonic rafts, detached and transported by pure mechanical, i.e. tectonic, action of glacial ice (subdivided into (a) squeezed or pressed‐out, (b) dragged, and (c) pushed rafts) and (2) glacio‐erosional rafts, detached by freezing‐on, transported within the ice, and deposited mostly by a melting‐out process. A third group of rafts, of composite origin, is also briefly discussed and exemplified. Attention is drawn to the fact that quite a number of glacial rafts are known by other names, e.g. some of the very large ones, simply representing squeezed‐up (‘ice thrust’) end moraines, or very minute rafts occurring within tills and often called ‘soft clasts’, ‘substratum lenses’, etc.