A new CT scan methodology to characterize a small aggregation gravel clast contained in a soft sediment matrix
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...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2017-03-01
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| Series: | Earth Surface Dynamics |
| Online Access: | http://www.earth-surf-dynam.net/5/199/2017/esurf-5-199-2017.pdf |
| Summary: | 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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| ISSN: | 2196-6311 2196-632X |