Article (Scientific journals)
Volcanic influence of Mt. Fuji on the watershed of Lake Motosu and its impact on the lacustrine sedimentary record
Lamair, Laura; Hubert, Aurelia; Yamamoto, Shinya et al.
2018In Sedimentary Geology, 363, p. 200-220
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Keywords :
Lake Motosu; Mount Fuji; Volcano; Mass-transport deposits; Turbidites; Sediment accumulation rate
Abstract :
[en] Lacustrine sediments are particularly sensitive to modifications within the lake catchment. In a volcanic area, sedimentation rates are directly affected by the history of the volcano and its eruptions. Here, we investigate the impact of Mt. Fuji Volcano (Japan) on Lake Motosu and its watershed. The lacustrine infill is studied by combining seismic reflection profiles and sediment cores. We show evidence of changes in sedimentation patterns during the depositional history of Lake Motosu. The frequency of large mass-transport deposits recorded within the lake decreases over the Holocene. Before ~8000 cal yr BP, large sublacustrine landslides and turbidites were filling the lacustrine depression. After 8000 cal yr BP, only one large sublacustrine landslide was recorded. The change in sedimentation pattern coincides with a change in sediment accumulation rate. Over the last 8000 cal yr BP, the sediment accumulation rate was not sufficient enough to produce large sublacustrine slope failures. Consequently, the frequency of large masstransport deposits decreased and only turbidites resulting from surficial slope reworking occurred. These constitute the main sedimentary infill of the deep basin. We link the change in sediment accumulation rate with (i) climate and vegetation changes; and (ii) theMt. Fuji eruptions which affected the LakeMotosu watershed by reducing its size and strongly modified its topography. Moreover, this study highlights that the deposition of turbidites in the deep basin of Lake Motosu is mainly controlled by the paleobathymetry of the lakefloor. Two large mass-transport deposits, occurring around ~8000 cal yr BP and ~2000 cal yr BP respectively, modified the paleobathymetry of the lakefloor and therefore changed the turbidite depositional pattern of Lake Motosu.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Lamair, Laura ;  Université de Liège - ULiège > Département de géographie > Géomorphologie et Géologie du Quaternaire
Hubert, Aurelia  ;  Université de Liège - ULiège > Département de géographie > Géomorphologie et Géologie du Quaternaire
Yamamoto, Shinya
El Ouahabi, Meriam  ;  Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires
Vander Auwera, Jacqueline ;  Université de Liège - ULiège > Département de géologie > Pétrologie, géochimie endogènes et pétrophysique
Obrochta, Stephen
Boes, Evelien
Nakamura, Atsunori
Fujiwara, Osamu
Shishikura, Masanobu
Schmidt, Sabine
Siani, Giuseppe
Miyairi, Yosuke
Yokoyama, Yusuke
De Batist, Marc
Heyvaert, Vanessa
More authors (6 more) Less
Language :
English
Title :
Volcanic influence of Mt. Fuji on the watershed of Lake Motosu and its impact on the lacustrine sedimentary record
Publication date :
2018
Journal title :
Sedimentary Geology
ISSN :
0037-0738
eISSN :
1879-0968
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
363
Pages :
200-220
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
“QuakeRecNankai” (BELSPO BRAIN-be BR/121/A2).
Funders :
BELSPO project
Available on ORBi :
since 31 January 2018

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