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核技术  2015 

二龙湾玛珥湖年纹层湖泊沉积物元素的X射线荧光光谱分析

DOI: 10.11889/j.0253-3219.2015.hjs.38.020101, PP. 20101-20101

Keywords: X射线荧光分析,湖泊沉积物,元素地球化学特征,二龙湾,环境变化记录,纹层年代学

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Abstract:

运用同步辐射X射线荧光光谱分析技术对二龙湾玛珥湖0?485mm(AD1282?AD1988)区间年纹层沉积物进行了分析,获得了Ti、Mn、Br等6种高分辨率元素含量。并对元素进行了因子分析,提取出控制沉积物化学组成的三个主要因子:早期成岩因子F1、生物成因因子F2和流域侵蚀因子F3。进一步的研究还发现,F2和F3的因子得分分别可以作为气候冷暖和干湿变化的代用指标,从而为古气候古环境重建提供了一条有效的新途径。结合高分辨率纹层年代学结果,初步评价了过去700年来该区域气候及环境演化历史。小冰期在二龙湾地区结束于AD1890年,期间波动较大,但不是表现为持续冷气候,共经历了三次冷波动集中时期。进入AD1890年以来,该区整体上呈现温暖湿润气候,但具体表现为温度逐渐降低、降水量逐渐增加的趋势,直至AD1985年降水量回落,温度转而升高。这是20世纪气候变暖在该区域的反映。

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