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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >A record of Holocene climate in the mineral magnetic record of Alpine lakes: Sagistalsee and Hinterburgsee
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A record of Holocene climate in the mineral magnetic record of Alpine lakes: Sagistalsee and Hinterburgsee

机译：高山湖泊的矿物磁记录中的全新世气候记录：Sagistalsee和Hinterburgsee

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摘要

The effect of climate variations on the magnetic properties of sediments from two small Alpine lakes in the Bernese Alps, Switzerland was investigated. Although relatively similar in water volume and general environment, Sagistalsee and Hinterburgsee have different catchment vegetation and lithology due to their different elevation and geographic locations. The climatic signal in the mineral magnetic parameters of the sediments was validated and interpreted with the aid of palynological and geochemical data. The sediment age was determined with several accelerated mass spectrometry ~(14)C dates. The results from the different lakes compare well on a common time scale and show that the influence of local conditions on the magnetic record is rather small. A climatic influence on the mineral magnetism has been recognized at both studied sites. This is interpreted as a consequence of the production of an authigenic mineral with particularly uniform magnetic properties during the warmer stages and the influx of heterogeneous detrital magnetic minerals during the colder stages. The clearest climate record is found in sediments with no organic matter whereas the anoxic conditions found in highly organic sediment can completely obliterate the climate signal recorded in the sediment magnetic properties.
机译：研究了气候变化对瑞士伯恩阿尔卑斯山两个高山湖泊的沉积物磁性的影响。尽管萨吉斯塔尔湖和欣特堡湖在水量和总体环境方面相对相似，但由于海拔和地理位置的不同，它们的集水区植被和岩性也不同。利用沉积学和地球化学数据验证和解释了沉积物矿物磁参数中的气候信号。沉积物年龄是通过数个〜（14）C加速质谱法确定的。在相同的时间尺度上，来自不同湖泊的结果进行了比较，结果表明，当地条件对磁记录的影响很小。在两个研究地点都认识到气候对矿物磁性的影响。这被解释为是由于在较热阶段产生了具有特别均匀的磁性的自生矿物，而在较冷阶段产生了异质碎屑磁性矿物的流入。在没有有机物的沉积物中发现了最清晰的气候记录，而在高度有机沉积物中发现的缺氧条件则可以完全消除沉积物中磁性所记录的气候信号。

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