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首页> 外文期刊>The holocene >7200 years of Rhone river flooding activity in Lake Le Bourget, France: a high-resolution sediment record of NW Alps hydrology
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7200 years of Rhone river flooding activity in Lake Le Bourget, France: a high-resolution sediment record of NW Alps hydrology

机译：法国勒布尔热湖7200年的罗纳河洪水活动：西北阿尔卑斯山水文学的高分辨率沉积记录

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摘要

Magnetic susceptibility (MS) was measured with high resolution (5 mm) on a 9 m long, ~(14)C dated core from Lake Le Bourget (Savoie, France), spanning the last 7200 years. The strong correlation (R = 0.85) of the MS with the silicate-borne suite of elements (Si, Al, Fe, Mg, K) and anti-correlation with the carbonate content (R = — 0.87) allows it to be used as a proxy for the fluctuations of the abundance of riverborne clastic fraction versus authigenic carbonates in sediment. As the Rhone is the only river bringing a significant amount of silicate minerals to the coring site, the MS downstream is interpreted as a proxy of the Rhone suspended load discharge in Lake Le Bourget. This is confirmed over the last 3000 years by the good match with the evolution of hydrological activity of the Rhone as it is known through geomorphological studies of well-dated archaeological sites. Over the last 7200 years, the record is consistent with the regional record of lake water-level fluctuations. While the intensity of the MS signal might be widely affected by the human impact on soil stability, the timing of the period of enhanced hydrological activity appears to be mostly climate-related, and should thus constitute a first step toward a high-resolution (< 8 yr) continuous history of hydrological conditions in the NW Alps.
机译：在过去7200年的时间里，使用Le Bourget湖（法国萨瓦省）的9m长，约（14）C的岩心以高分辨率（5 mm）测量了磁化率（MS）。 MS与硅酸盐中的一系列元素（Si，Al，Fe，Mg，K）的强相关性（R = 0.85）以及与碳酸盐含量的反相关性（R =-0.87）使其可以用作泥沙中河源性碎屑含量相对于自生碳酸盐含量的波动的代表。由于罗纳河是唯一将大量硅酸盐矿物带到取芯地点的河流，因此下游MS被解释为Le Bourget湖中罗纳河悬浮负荷排放的代表。在过去的3000年中，这与罗纳河的水文活动的良好匹配得到了证实，罗纳河的水文活动是通过对历史悠久的考古遗址进行地貌研究而得知的。在过去的7200年中，该记录与湖泊水位波动的区域记录一致。虽然MS信号的强度可能会受到人类对土壤稳定性的广泛影响，但水文活动增强时期的时机似乎主要与气候有关，因此应构成迈向高分辨率的第一步（< 8年）在西北阿尔卑斯山的水文状况的连续历史。

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