Impact of long-term explosive volcanism from Nemrut and Süphan volcanoes on the compositional, temporal, dynamic, and paleoclimatic evolution of Lake Van (Turkey)

总的目标是在过去500ka内重建一个由活火山和活火山Nemrut和Süphan毗邻的构造和火山高度活跃的湖盆的时间、地球动力学和环境(古气候)。研究战略包括对火山爆炸产物和可能于2010年通过在凡湖钻探获得的500个特弗拉岩层进行实地工作，这些特弗拉岩层代表岩芯的地层和时间框架。分析方法，包括结构、结构、矿物学和化学成分(XRF、EMP、玻璃和斑晶的激光-ICPMS和40Ar/39Ar单晶测年)，将能够确定喷发的规模、它们在时间和空间上的分布、钻探地点之间的相关性以及随着时间的推移进入碱性湖泊的物质通量。气候指标包括分隔特弗拉单元和古风方向的古土壤。对突如其来的大规模撞击造成的沉降物、火山碎屑流、侧翼坍塌和海啸进行时间和动态重建，将有助于评估巨大的凡湖附近快速发展地区的危险和风险。

The temporal, geodynamic and environmental (paleoclimatic) reconstruction of a tectonically and volcanically highly active lake basin, bordered by active volcanoes Nemrut and Süphan, over the past c. 500 ka is the overall objective. Research strategies include fieldwork on the explosive products of both volcanoes and likely >500 tephra layers to be obtained by drilling into Lake Van in 2010, tephra layers representing the stratigraphic and temporal framework of the cores. Analytical methods, including structure, texture, mineralogical and chemical composition (XRF, EMP, laser-ICP-MS of glass and phenocrysts and 40Ar/39Ar single crystal dating), will allow determining the magnitude of eruptions, their distribution in time and space, correlation between drill sites and mass flux into the alkaline lake through time. Climate proxies include paleosols separating tephra units and paleowind directions. Temporal and dynamic reconstruction of fallout, pyroclastic flows, flank collapses and tsunamis resulting from sudden mass impact onto the lake will help to assess hazard and risk for the rapidly developing areas bordering huge Lake Van.