Citation:

tel-00909603

Name: Grain size distributions within the proglacial area of the Bossons glacier (France)
Published: 2013
License: https://creativecommons.org/licenses/by/3.0/

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Related to:

Maizels, J K (1976): A comparison of present-day and Pleistocène Proglacial environments, with particular reference to geomorphology and sedimentology [dissertation]. University of London King's College, 673 pp

Coverage:

Median Latitude: 45.898133 * Median Longitude: 6.850307 * South-bound Latitude: 45.896839 * West-bound Longitude: 6.849050 * North-bound Latitude: 45.899417 * East-bound Longitude: 6.851519

Event(s):

Glacier_des_Bossons * Latitude: 45.880000 * Longitude: 6.860000 * Location: Bossons Glacier, Massif du Mont-Blanc, Haute-Savoie, France

Comment:

This dataset presents grain size distributions within the Bossons glacier proglacial area. Bossons glacier is rapidly retreating and its proglacial area is deglaciated for ~30 years. It is an intriguing location to study periglacial and proglacial erosion processes which requires to characterize proglacial sediments. Such characterization have been previously carried out by Maizels (1976).

Grain Size Distribution (GSD) of 13 proglacial sediment samples have been determined by in situ sieving and laser micro-granulometry in laboratory. Samples are located on a longitudinal profile of Bossons stream alluvial plain. In upstream part of the alluvial plain, volume occupied by the largest clast gives the sample volume needed for a reliable GSD analysis. Every GSD was performed on an active gravel bar except for Av3 which was carried out in a perenial and vegetalized one.

GSD on the whole area is coarse and mainly constituted by small and large pebbles (~40% of each sample). Silts are almost inexistent (2%). Gravels are generally less present than sands, respectively 8% and 12%.

This lack of gravel is commonly observed and is explained by fracturation processes : particles coarser than 5 mm are mainly rock fragments disaggregating into monomineral grains which are inferior to 2 mm (Maizels, 1976).

Straightforward GSD analysis shows a grain size reduction toward the outlet of the alluvial plain. From upstream to downstream, each granulometric class seems to follow the same general variations : sand particles increase from 6% upstream to 20% downstream whereas coarse pebbles decrease from 57% to 20%.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Sample ID	Sample ID		Guillon, Hervé
2	LATITUDE	Latitude			Geocode
3	LONGITUDE	Longitude			Geocode
4	Size fraction < 0.004 mm, clay	<4 µm	%	Guillon, Hervé
5	Size fraction 0.063-0.004 mm, silt	63-4 µm	%	Guillon, Hervé
6	Size fraction 0.125-0.063 mm, 3.0-4.0 phi, very fine sand	125-63 µm	%	Guillon, Hervé
7	Size fraction 0.250-0.125 mm, 2.0-3.0 phi, fine sand	250-125 µm	%	Guillon, Hervé
8	Size fraction 0.500-0.250 mm, 1.0-2.0 phi, medium sand	500-250 µm	%	Guillon, Hervé
9	Size fraction 1.000-0.500 mm, 0.0-1.0 phi, coarse sand	1-0.5 mm	%	Guillon, Hervé
10	Size fraction 2.000-1.000 mm, (-1.0)-0.0 phi, very coarse sand	2-1 mm	%	Guillon, Hervé
11	Size fraction 5-2 mm, granular gravel	5-2 mm	%	Guillon, Hervé
12	Size fraction 10-5 mm, gravel	10-5 mm	%	Guillon, Hervé
13	Size fraction 20-10 mm, fine pebbles, gravel	20-10 mm	%	Guillon, Hervé
14	Size fraction 40-20 mm, medium pebbles	40-20 mm	%	Guillon, Hervé
15	Size fraction 80-40 mm, coarse pebbles	80-40 mm	%	Guillon, Hervé
16	Size fraction 160-80 mm, cobbles	160-80 mm	%	Guillon, Hervé
17	Size fraction 320-160 mm, cobbles	320-160 mm	%	Guillon, Hervé
18	Mass	Mass	kg	Guillon, Hervé
19	Distance	Distance	m	Guillon, Hervé	to outlet

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

221 data points

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