Luminescence dating of Late Pleistocene eruptions in the Eifel Volcanic Field, Germany

Luminescence dating of Late Pleistocene eruptions in the Eifel Volcanic Field, Germany
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德国埃菲尔火山场晚更新世喷发的发光测年

DOI:
10.1002/jqs.2961
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发表时间:
2017
影响因子:
2.3
通讯作者:
Ludwig
Ludwig
中科院分区:
地球科学3区
文献类型:
--
作者:
Schmidt;Christoph;Schaarschmidt;Thomas;Büchel;Richter;Daniel;Zöller;Ludwig

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晚更新世和全新世火山喷发的可靠年表对危害分析至关重要,但准确和精确地确定这些事件的年代往往是困难的。本文采用不同的发光技术对德国第四纪Eifel火山场(EVF)的岩屑和火山加热基岩中被加热的地壳捕虏体中的石英和多矿物提取物进行了研究。石英的红色热释光(RTL)和光激发发光(OSL)和多矿物材料的后红外激发发光结果一致,表明熔岩就位过程中发光信号完全重置,信号足够稳定。通过实验室再生辐照前的退火处理,可以消除来自熔岩接触带的一个独立已知年龄样品的RTL和OSL年龄低估。Wartgesberg火山喷发的平均发光年龄为33.6±2.4 ka,与独立的年龄控制相吻合,而Facher Höhe火山锥的平均发光年龄为15.5±1.1 ka,比之前的假设要年轻得多。这一结果代表了EVF已知的第三年轻的喷发。我们的新数据与气候控制触发Eifel火山活动的假设一致,并证实了与软流圈上升流有关的活火山活动在EVF中从NW向SE迁移。
Robust chronologies of Late Pleistocene and Holocene volcanic eruptions are vital for hazard analysis but accurate and precise dating of these events is often difficult. Here we apply various luminescence techniques to quartz and polymineral extracts from heated crustal xenoliths enclosed in scoria and volcanically heated bedrock in the Quaternary Eifel Volcanic Field (EVF), Germany. Consistent results from red thermoluminescence (RTL) and optically stimulated luminescence (OSL) of quartz and from post‐infrared infrared stimulated luminescence of polymineral material demonstrate complete luminescence signal resetting during lava emplacement and sufficient signal stability. RTL and OSL age underestimation of one sample with independently known age from the lava contact zone could be eliminated by annealing before laboratory regenerative irradiation. The average luminescence age of 33.6 ± 2.4 ka for the Wartgesberg eruption is in good agreement with independent age control, while the average age of 15.5 ± 1.1 ka for the Facher Höhe scoria cone is much younger than previously assumed. This result represents the third youngest known eruption in the EVF. Our new data are in line with the hypothesized climate‐controlled triggering of Eifel volcanism and confirm that active volcanism related to asthenosphere upwelling migrates from NW to SE in the EVF.
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