格陵兰冰芯Pt异常在Bølling-Allerød/Younger Dryas边界附近可能的火山起源
Charlotte E Green1,2, James U L Baldini2, Richard J Brown2
1Centre of Climate, Ocean and Atmosphere, Department of Earth Sciences, Royal Holloway, University of London, Egham, United Kingdom.
PloS one
|September 18, 2025
概括
年轻的德里亚斯事件.
科学领域:
- 古气候学 古气候学
- 地质化学 地质化学
- 火山学 火山学是一门学科.
背景情况:
- 年轻的干旱事件 (YDE) 是一个重要的千年规模的冷却事件.
- 传统上归因于融水脉冲,其他触发因素包括波利德撞击和火山活动.
- 格陵兰岛GISP2冰核中的金 (Pt) 峰值与YDE的出现一致,促使调查.
研究的目的:
- 评估Laacher See喷发 (LSE) 和潜在的冲击事件作为YDE的触发因素.
- 为了分析来自Laacher See Tephra (LST) 和格陵兰冰芯的地质化学数据.
- 为了确定GISP2冰核中的异常的来源.
主要方法:
- 在Lacher See Tephra (LST) 的地化学分析.
- 使用GICC05时间表,确认与YDE发作相对的金 (Pt) 峰值时间.
- 组元素 (PGE) Pt尖峰的地化学与潜在喷发源的比较.
主要成果:
- 地质化学数据表明,Laacher See喷发 (LSE) 并没有导致格陵兰Pt尖峰.
- 在Pt峰值,北格陵兰冰核项目 (NGRIP) 硫峰值,YDE启动和LSE.之间存在时间偏移.
- 皮特峰的地质化学最接近于海底喷发的分成火山物质,可能是冰岛的.
结论:
- 拉切尔湖喷发不太可能是格陵兰Pt尖端的来源.
- 皮特尖峰可能代表来自冰岛未知的冰下或海底裂喷发的分成火山物质.
- Pt尖峰的持续时间支持长时间的裂喷发,而不是瞬间的事件.
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