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What causes till thickness to change over distance? Answers from Myrdalsjokull, Iceland

Kjaer, Kurt LU ; Kruger, J and van der Meer, JJM (2003) In Quaternary Science Reviews 22(15-17). p.1687-1700
Abstract
Many explanations have been provided for variations of the spatial distribution and thickness of till sheets. This paper gives new insight into the architecture of a stratigraphically distinct till sheet as a function of the type of substratum and preadvance topography at a scale of similar to 10 km. This emphasises the sensitivity of the subglacial system to changes in the basal drainage conditions. The study area is the forefield of Slettjokull at the northern margin of the Myrdalsjokull ice cap, central south Iceland. Here, detailed lithostratigraphical and sedimento logical investigations, including mapping of the thickness for two till units, sediment logging, clast fabric and geotechnical measurements provide a basis for... (More)
Many explanations have been provided for variations of the spatial distribution and thickness of till sheets. This paper gives new insight into the architecture of a stratigraphically distinct till sheet as a function of the type of substratum and preadvance topography at a scale of similar to 10 km. This emphasises the sensitivity of the subglacial system to changes in the basal drainage conditions. The study area is the forefield of Slettjokull at the northern margin of the Myrdalsjokull ice cap, central south Iceland. Here, detailed lithostratigraphical and sedimento logical investigations, including mapping of the thickness for two till units, sediment logging, clast fabric and geotechnical measurements provide a basis for interpretations. The results show that the thickness of a stratigraphically distinct till sheet is directly correlated to the type of substratum. Where the substratum consists of sorted sediments the till is thin. Conversely, the till is thick where the substratum consists of till overlying sorted sediments. A sedimentological model is presented in which till thickness is tied to the variable hydraulic conditions experienced in a deforming subglacial bed. (C) 2003 Elsevier Ltd. All rights reserved. (Less)
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organization
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type
Contribution to journal
publication status
published
subject
in
Quaternary Science Reviews
volume
22
issue
15-17
pages
1687 - 1700
publisher
Elsevier
external identifiers
  • wos:000184504700009
  • scopus:0041766645
ISSN
0277-3791
DOI
10.1016/S0277-3791(03)00162-8
language
English
LU publication?
yes
id
980df451-3236-4617-9709-24f4b741fbb5 (old id 304831)
date added to LUP
2007-09-16 07:54:37
date last changed
2018-01-07 05:49:53
@article{980df451-3236-4617-9709-24f4b741fbb5,
  abstract     = {Many explanations have been provided for variations of the spatial distribution and thickness of till sheets. This paper gives new insight into the architecture of a stratigraphically distinct till sheet as a function of the type of substratum and preadvance topography at a scale of similar to 10 km. This emphasises the sensitivity of the subglacial system to changes in the basal drainage conditions. The study area is the forefield of Slettjokull at the northern margin of the Myrdalsjokull ice cap, central south Iceland. Here, detailed lithostratigraphical and sedimento logical investigations, including mapping of the thickness for two till units, sediment logging, clast fabric and geotechnical measurements provide a basis for interpretations. The results show that the thickness of a stratigraphically distinct till sheet is directly correlated to the type of substratum. Where the substratum consists of sorted sediments the till is thin. Conversely, the till is thick where the substratum consists of till overlying sorted sediments. A sedimentological model is presented in which till thickness is tied to the variable hydraulic conditions experienced in a deforming subglacial bed. (C) 2003 Elsevier Ltd. All rights reserved.},
  author       = {Kjaer, Kurt and Kruger, J and van der Meer, JJM},
  issn         = {0277-3791},
  language     = {eng},
  number       = {15-17},
  pages        = {1687--1700},
  publisher    = {Elsevier},
  series       = {Quaternary Science Reviews},
  title        = {What causes till thickness to change over distance? Answers from Myrdalsjokull, Iceland},
  url          = {http://dx.doi.org/10.1016/S0277-3791(03)00162-8},
  volume       = {22},
  year         = {2003},
}