Environmental response to climatic and volcanic events in NE Anatolia during the last 20,000 years based on annually laminated sediments from Lake Van

根据凡湖每年的层压沉积物，过去 20,000 年来安纳托利亚东北部气候和火山事件的环境响应

• 批准号: 37107753
• 负责人: Professor Dr. Thomas Litt
• 金额: --
• 依托单位: Abteilung Paläontologie
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/37107753?language=en
• 关键词: Environmental; response; climatic; volcanic; events

Tephra layers drilled in 400 m-deep Lake Van (Anatolia) in 2004 will be studied structurally, texturally and compositionally for correlation between drill sites and with volcanic deposits on land. Analysis of equivalent deposits on the historically active caldera volcano Nemrut, the major supplier of tephra, will allow reconstructing larger volcanic events (Plinian fallout, pyroclastic flows and flank collapses), magma evolution and environmental impacts such as tsunamis. Interaction of volcanic glass with alkaline pore solutions in lake sediments is likely to have released biologically relevant elements. The analytical focus is on Iaser-ICP-MS composition of glass shards and phenocrysts and 40Ar/39Ar single crystal dating. Reconstruction of mass transfer processes during major volcanic events adjacent to the lake will aid volcanic hazard and risk assessment at Lake Van. High-resolution pollen analyses based on the annually laminated lacustrine sediments should reflect the impact of volcanic events on paleoenvironment. The comparison between volcanic and climatically induced vegetation changes will be analyzed. Short-term effects of volcanic eruptions on vegetation can only be traced by a high-resolution stratigraphy. The varved sediment record of lake Van is an excellent archive for this approach.

2004年在安纳托利亚400米深的凡湖（Lake Van）钻探的Tephra层将进行结构、结构和成分研究，以确定钻探点与陆地火山沉积物之间的相关性。对历史上活跃的火山口内姆鲁特火山（tephra的主要供应地）上的同等沉积物进行分析，将有助于重建更大的火山事件（普林尼沉降物、火山碎屑流和侧翼崩塌）、岩浆演化和海啸等环境影响。火山玻璃与湖泊沉积物中碱性孔隙溶液的相互作用可能释放出与生物相关的元素。分析重点是玻璃碎片和斑晶的Iaser-ICP-MS组成和40Ar/39Ar单晶定年。重建湖附近主要火山活动的传质过程将有助于湖火山灾害和风险评估。基于年层状湖相沉积物的高分辨率花粉分析应反映火山事件对古环境的影响。将比较火山和气候引起的植被变化。火山喷发对植被的短期影响只能通过高分辨率地层学来追踪。凡湖的变异沉积物记录是这种方法的一个极好的档案。