A comparison of micro-CT and thin section analysis of Lateglacial glaciolacustrine varves from Glen Roy, Scotland

Bendle, Jacob; Palmer, Adrian; Carr, Simon

doi:10.1016/j.quascirev.2015.02.008

Cited by 40 publications

(29 citation statements)

References 105 publications

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“…A recent review of computed tomography (CT) scans in the geosciences (Cnudde and Boone, 2013) demonstrates the growing application possibilities of X-ray technology as well as the limits of the technique. Improvements in CT scanning allowed exploration of complex sedimentary structures through 3-D reconstructions, leading to improvement compared to classic 2-D imaging (Pirlet et al, 2010;Bendle et al, 2015). The method is based on the relative density of each voxel (i.e., volumetric pixel) constituting the chosen sample.…”

Section: Introductionmentioning

confidence: 99%

“…Image analysis of the 3-D numerical model can then be used to obtain quantitative information about selected constituents as well as volumetric information (Bolte and Cordelieres, 2006). This type of methodology was recently used to identify and quantify gypsum formation in marine sediments (Pirlet et al, 2010) as well as different sediment clast deposition in a glacio-lacustrine varved context (Bendle et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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A new CT scan methodology to characterize a small aggregation gravel clast contained in a soft sediment matrix

et al. 2017

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Abstract. Over the past decades, X-ray computed tomography (CT) has been increasingly applied in the geosciences community. CT scanning is a rapid, non-destructive method allowing the assessment of relative density of clasts in natural archives samples. This study focuses on the use of this method to explore instantaneous deposits as major contributors to sedimentation of high-elevation lakes in the Alps, such as the Lake Lauvitel system (western French Alps). This lake is located within a very steep valley prone to episodic flooding and features gullies ending in the lake. This variety of erosion processes leads to deposition of sedimentary layers with distinct clastic properties. We identified 18 turbidites and 15 layers of poorly sorted fine sediment associated with the presence of gravels since AD 1880. These deposits are respectively interpreted as being induced by flood and wet avalanche. This constitutes a valuable record from a region where few historical records exist. This CT scan approach is suitable for instantaneous deposit identification to reconstruct past evolution and may be applicable to a wider variety of sedimentary archives alongside existing approaches.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A new CT scan methodology to characterize a small aggregation gravel clast contained in a soft sediment matrix

et al. 2017

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“…Leighton et al, 2012;Lea and Palmer, 2014;Bendle et al, 2015), but the information that has been gleaned from thin sections of un-consolidated sediments in this and other investigations (see Figs. 7-9), including human-made materials such as concrete and mortar (Menzies et al, 2010;van der Meer and Menzies, 2011 -and references within), is undeniable.…”

Section: The Value Of Micromorphologymentioning

confidence: 83%

“…In addition, quantification of microstructures (Carr and Goddard, 2008;Menzies and Whiteman, 2009;Patel, 2011;van der Meer and Menzies, 2011;Linch and van der Meer, 2013;Neudorf et al, 2013;Lea and Palmer, 2014;Narloch et al, 2015) and new methods in 'microstructural mapping' (Phillips et al, 2011;Gehrmann et al, 2016), are developing with promising results. Finally, in combination with thin sections, 3D microtomography studies of microstructures (Kilfeather and van der Meer, 2008;Tarplee et al, 2011;Bendle et al, 2015;Groves, in prep) and development of the Metripol microscope system to automatically measure and record birefringence (Linch and van der Meer, 2013;Hiemstra and Carr, in prep) should be even more rewarding.…”

Section: The Value Of Micromorphologymentioning

confidence: 99%

Micromorphology of diamicton affected by iceberg-keel scouring, Scoresby Sund, East Greenland

Linch

Dowdeswell

2016

Quaternary Science Reviews

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Icebergs are important as agents of deposition and seafloor reworking on glacier-influenced continental margins. When the keel of an iceberg exceeds water depth it ploughs through soft sediments producing scours/ploughmarks that can be kilometres long, hundreds of metres wide and sometimes tens of metres deep. Because the influence of iceberg keels on sediment is a critical factor when offshore structures (e.g. pipelines, power cables) are installed, the surface morphology of iceberg scours on the seafloor is relatively welldocumented. Less however, is known about sub-scour deformation below the seafloor. This is particularly true of iceberg scoured diamicton (poorly sorted sediment comprising a variety of particle sizes), which is present in many high-latitude fjords and continental shelves. The aim of this research is to examine directly (macroscopically and microscopically, with thin sections) the style and intensity of deformation caused by the scouring action of iceberg keels in diamicton offshore of East Greenland. Results show that a distinctive suite of deformation structures (individual structures and overprinted structural patterns) dominated by planar shear, sediment mixing and high porewater, and dropstones characterises iceberg scoured diamicton. In addition, diamicton from areas of high-intensity iceberg scouring tends to show a wider variety, higher frequency and distribution, more abundant and better-developed deformation structures than diamicton from areas of intermediate-and low-intensity iceberg scouring. Characterising the effects of iceberg scour in diamicton is important more widely to inform: i) reconstruction of the geometry and dynamics of former ice sheets; and ii) installation and protection of offshore engineering structures in diamicton where iceberg scouring presents a geohazard. The value of micromorphology is significant especially in the absence of macroscopic sediment exposures/outcrops where the study of cores is necessary instead.

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“…Several landslides in Glen Roy and Glen Gloy have also been linked to slope instability associated with the sudden draining of the lakes and the rapid unloading of the ground, while detailed levelling of the shorelines has demonstrated differential glacio-isostatic uplift and dislocation of crustal blocks Cornish, 1982a, 1982b). More recent studies have added to the scientific understanding and value of the area (Fabel et al, 2010;Macleod et al, 2011;Palmer et al, 2010Palmer et al, , 2012Ballantyne, 2012;Bendle et al, 2015;Boston and Lukas, 2016;Devine and Palmer, 2016;Sissons, 2016aSissons, , 2016b, with key issues also discussed during and following Quaternary Research Association (QRA) Field Meetings in 1989 and 2008 (Peacock and Cornish, 1989;Palmer et al, 2008;Peacock, 2009 …”

Section: Scientific Discovery Debate and Current Valuementioning

confidence: 99%

The Parallel Roads of Glen Roy, Scotland: geoconservation history and challenges

Brazier

Gordon

Faulkner

et al. 2017

Proceedings of the Geologists' Association

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Glen Roy is a classic geosite for ice-dammed lake shorelines, the Parallel Roads, and associated features formed during the Loch Lomond (Younger Dryas) Stade (12.9-11.7ka). The area played a key part in the development of the glacial theory in the early 19th century and continues today to have outstanding scientific value for understanding the processes and timing of events at the end of the last glaciation. Glen Roy has also been longappreciated as an awe-inspiring visitor attraction, and is now a flagship site for geotourism within Lochaber Geopark. Statutory geoconservation in Glen Roy, beginning in the second half of the 20th century, was founded on the exceptional scientific value of the area. The history and practice of geoconservation in Glen Roy illustrate the contested values of geoheritage and the evolving approaches adopted. Important lessons include the need for open dialogue and partnership working among the local community, land owners and managers, the statutory conservation agency (Scottish Natural Heritage), Lochaber Geopark and the scientific community.

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A comparison of micro-CT and thin section analysis of Lateglacial glaciolacustrine varves from Glen Roy, Scotland

Cited by 40 publications

References 105 publications

A new CT scan methodology to characterize a small aggregation gravel clast contained in a soft sediment matrix

A new CT scan methodology to characterize a small aggregation gravel clast contained in a soft sediment matrix

Micromorphology of diamicton affected by iceberg-keel scouring, Scoresby Sund, East Greenland

The Parallel Roads of Glen Roy, Scotland: geoconservation history and challenges

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