Reference : Use of high-resolution seismic reflection data in the paleogeographical reconstructio...
E-prints/Working papers : First made available on ORBi
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Use of high-resolution seismic reflection data in the paleogeographical reconstruction of shallow Lake Yamanaka (Fuji Five Lakes, Japan)
Lamair, Laura mailto [Université de Liège - ULiège > > SPHERES >]
Hubert, Aurelia mailto [Université de Liège - ULiège > Département de géographie > Géomorphologie et Géologie du Quaternaire >]
Yamamoto, S. []
Fujiwara, O. []
Yokoyama, Y. []
De Batist, M. []
Heyvaert, Vanessa []
QuakeRecNankai []
[en] lake level fluctuations ; Mt. Fuji ; depositional history
[en] High-resolution seismic profiles combined with the integration of published drilling data provide a detailed paleoenvironmental history of Lake Yamanaka (Fuji Five Lakes, Japan). This study presents a detailed analysis of different depositional stages of the current Lake Yamanaka (floodplain wetland, river and lake). From ca. 5500 cal yr BP to ca. 5050 cal yr BP, the Yamanaka Basin was occupied by floodplain wetlands. During that period, the landscape was very stable and the erosion on northeastern flank of Mt. Fuji was relatively limited. From ca. 5050 cal yr BP to ca. 3050 cal yr BP, the water level increased and the floodplain wetlands became a lake. From ca. 3050 cal yr BP to ca. 2050 cal yr BP, water level decreased progressively leading to a reduction of lake extension. During the lowering of lake water level, a 1 km2 mass-transport deposit modified the physiography of the lakefloor. From ca. 2050 cal yr BP to ca. 1050 cal yr BP, the lake disappeared and the depression was occupied by a river flowing toward the northwest. Morphological lows formed by mass-transport deposit were occupied by ponds. From ca. 1050 cal yr BP to present day, the lake water rose again connecting the pond with the main lake. Since then, lake water level continues to rise up to the current lake water level. Lake water level fluctuations are the results of several factors that could be concomitant: (i) change in precipitation rate; (ii) margin destabilization (the Yamanaka MTD); (iii) change in river inlets and therefore variation of water supplies; (iv) volcanic eruptions (scoria fall-out and lava flows); (v) change in vegetation cover. This study highlights the importance of coupling sediment cores and high-resolution seismic reflection profiling to identify lateral change and modification of the sedimentary inputs through time.
Belspo BRAIN

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