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Impacts of subglacial processes on underlying bedrock

Juliusson, Oscar LU (2019) In Dissertations in Geology at Lund University GEOL01 20191
Department of Geology
Abstract
Historically, the field of glacial geology has put much focus on the processes within the subglacial environment, their effects on unconsolidated sediments and the landforms they produce. Subsequently, the impact of subglacial processes is fairly well documented and understood regarding unconsolidated sediments. However, except for processes of abrasion and quarrying, not much focus has been dedicated to what effects these processes exert on the underlying bedrock. Recent studies have though shown that generic subglacial conditions do not only impact subglacial unconsolidated sediments but affect the underlying bedrock as well. These impacts are mainly due to the variation and containment of porewater pressures within the subglacial... (More)
Historically, the field of glacial geology has put much focus on the processes within the subglacial environment, their effects on unconsolidated sediments and the landforms they produce. Subsequently, the impact of subglacial processes is fairly well documented and understood regarding unconsolidated sediments. However, except for processes of abrasion and quarrying, not much focus has been dedicated to what effects these processes exert on the underlying bedrock. Recent studies have though shown that generic subglacial conditions do not only impact subglacial unconsolidated sediments but affect the underlying bedrock as well. These impacts are mainly due to the variation and containment of porewater pressures within the subglacial environment. When these pressures are elevated to levels exceeding the bedrock´s shear strength, hydrofracturing occur with penecontemporaneous injection of dilated/liquefied sediments. Strong similarities have been demonstrated between subglacial- and industrial hydrofracture systems, formed from a process commonly referred to as ‘fracking’. This have shown that industrial hydrofracturing in turn can be used as a tool to understand the dynamics of subglacial hydrofracture systems. In addition, hydrofracture systems are believed to exert a strong influence on the structural integrity and hydrogeological conditions of the bedrock. It also seems that they exert a controlling factor regarding quarrying and till continuity in postglacial areas that have undergone hydrofracturing. (Less)
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author
Juliusson, Oscar LU
supervisor
organization
course
GEOL01 20191
year
type
M2 - Bachelor Degree
subject
keywords
subglacial processes, liquefaction, hydrofracturing, bedrock, fracking
publication/series
Dissertations in Geology at Lund University
report number
573
language
English
id
8990827
date added to LUP
2019-07-16 14:47:03
date last changed
2019-07-16 14:47:03
@misc{8990827,
  abstract     = {Historically, the field of glacial geology has put much focus on the processes within the subglacial environment, their effects on unconsolidated sediments and the landforms they produce. Subsequently, the impact of subglacial processes is fairly well documented and understood regarding unconsolidated sediments. However, except for processes of abrasion and quarrying, not much focus has been dedicated to what effects these processes exert on the underlying bedrock. Recent studies have though shown that generic subglacial conditions do not only impact subglacial unconsolidated sediments but affect the underlying bedrock as well. These impacts are mainly due to the variation and containment of porewater pressures within the subglacial environment. When these pressures are elevated to levels exceeding the bedrock´s shear strength, hydrofracturing occur with penecontemporaneous injection of dilated/liquefied sediments. Strong similarities have been demonstrated between subglacial- and industrial hydrofracture systems, formed from a process commonly referred to as ‘fracking’. This have shown that industrial hydrofracturing in turn can be used as a tool to understand the dynamics of subglacial hydrofracture systems. In addition, hydrofracture systems are believed to exert a strong influence on the structural integrity and hydrogeological conditions of the bedrock. It also seems that they exert a controlling factor regarding quarrying and till continuity in postglacial areas that have undergone hydrofracturing.},
  author       = {Juliusson, Oscar},
  keyword      = {subglacial processes,liquefaction,hydrofracturing,bedrock,fracking},
  language     = {eng},
  note         = {Student Paper},
  series       = {Dissertations in Geology at Lund University},
  title        = {Impacts of subglacial processes on underlying bedrock},
  year         = {2019},
}