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首页> 外文期刊>Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine >Source identification of volcanic ashes by geochemical analysis of well preserved lacustrine tephras in Nahuel Huapi National Park.
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Source identification of volcanic ashes by geochemical analysis of well preserved lacustrine tephras in Nahuel Huapi National Park.

机译：通过对Nahuel Huapi国家公园保存完好的湖泊特非拉的地球化学分析，确定火山灰的来源。

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摘要

Well preserved volcanic ashes produced in recent events, recovered from sedimentary sequences extracted from three lakes belonging to Nahuel Huapi National Park, Northern Patagonia, were geochemically characterized in order to reveal patterns that allow the identification of the source. Two water bodies are situated in the direct impact area of volcanoes Calbuco and Puyehue-Cordon Caulle, while the third, lake Moreno, is situated in-between. The sedimentary sequences were dated by (210)Pb and (137)Cs techniques; the elemental composition was determined by Instrumental Neutron Activation Analysis. Distinctive patterns were found out when comparing glass shards, and also white pumice but in a lesser degree, of tephra layers extracted from lake Ilon, related mostly to volcano Calbuco events, and lake Nahuel Huapi (Brazo Rincon site), associated to Puyehue-Cordon Caulle eruptions. The geochemical parameters that showed decisive differences were SiO(2) and Na(2)O+K(2)O contents, the Eu anomaly, Rare Earth element ratios; the concentration of incompatible elements Cs, Rb, Th, Hf, Ta and Zr, and the compatible elements Cr and V. The six upper tephra layers extracted from lake Moreno showed geochemical patterns that allowed clear association with Calbuco and Puyehue-Cordon Caulle sources. These results set up the base for tephrochronological applications in historical periods in Nahuel Huapi National Park area.
机译：从最近从巴塔哥尼亚北部纳韦尔华皮国家公园的三个湖中提取的沉积序列中回收的火山灰保存完好，对其进行了地球化学表征，以揭示可识别其来源的模式。两个水体位于卡尔布科火山和Puyehue-Cordon Caulle火山的直接影响区，而第三个水体位于莫雷诺湖之间。沉积层序由（210）Pb和（137）Cs技术确定日期。元素组成通过仪器中子活化分析确定。比较玻璃碎片和白色浮石时发现的模式明显不同，白色浮石的含量也较低，主要是从伊隆湖提取的提菲拉层，主要与火山Calbuco事件有关，而纳韦尔·华皮湖（布拉索林孔遗址）则与普耶韦-科尔登有关Caulle爆发。显示出决定性差异的地球化学参数是SiO（2）和Na（2）O + K（2）O含量，Eu异常，稀土元素比率;不相容元素Cs，Rb，Th，Hf，Ta和Zr的浓度以及相容元素Cr和V的浓度。从莫雷诺湖提取的六个上特弗拉层的地球化学特征使其与Calbuco和Puyehue-Cordon Caulle的来源明显相关。这些结果为纳韦尔·华皮国家公园地区历史上的年代学应用奠定了基础。

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