海洋记录揭示了多个阶段的多巴的最后火山活动
B Caron1, G Del Manzo2,3, B Villemant2
1Institut des Sciences de la Terre de Paris, UMR 7193, Sorbonne Université, CNRS-INSU, 75252, Paris cedex 05, France. benoit.caron@sorbonne-universite.fr.
Scientific reports
|July 18, 2023
概括
托巴超级火山喷发的发生.
科学领域:
- 地球科学 地球科学 地球科学
- 火山学 火山学是一门学科.
- 古气候学 古气候学
背景情况:
- 年轻的托巴 (YTT) 喷发,约74,000年前,是关于其持续时间和全球气候影响的辩论.
- 以前的模型表明,这是一次短暂的,爆炸性的超级喷发,具有显著的气候和人类进化后果.
- YTT的精确喷发历史及其在气候变化中的作用仍然是正在进行的科学讨论的主题.
研究的目的:
- 重新评估托巴火山综合体的喷发历史和持续时间.
- 提供对托巴火山爆发规模和时间表的修订理解.
- 重新评估托巴火山活动对环境和进化的影响.
主要方法:
- 在托巴火山中心附近对BAR94-25海洋核心的分析.
- 高分辨率tephrostratigraphy和氧同位素 (δ18O) 层谱的整合.
- 岩层的纹理和地质化学分析.
主要成果:
- 识别了至少17个不同的tephra和cryptotephra层,表明了漫长的喷发历史.
- 分类的岩层分为三个火山活动阶段 (VAP1-VAP3),跨越大约5万年.
- 主阶段 (VAP2),包括YTT,估计在约10,000年内发生了6次喷发事件.
结论:
- 托巴火山活动比以前建议的要长得多,需要修订喷发模型.
- 对气候和环境重建来说,重新估计灰和二氧化的排放量和分散率至关重要.
- 这一修订的时间表对了解过去的气候变化,人类进化和移民模式有影响.
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