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在石英中对Ti扩散和岩火山喷发的化新约束

Andreas Audétat¹, Axel K Schmitt^2,3, Raphael Njul⁴

¹Bayerisches Geoinstitut, University of Bayreuth, Bayreuth, Germany. andreas.audetat@uni-bayreuth.de.

Nature communications

|July 17, 2023

概括

石英中的扩散为火山爆发的时间提供了新的见解. 这项研究表明,岩室的复苏到喷发可能需要几年到几千年,比以前认为的要长得多.

科学领域:

地质化学地质化学
火山学火山学是一门学科.
晶体学晶体学是指结晶学.

背景情况:

在石英中的扩散对于测年岩过程至关重要.
在石英中现有的实验性扩散系数显示出显著的差异 (高达三次数).

研究的目的:

用天然样本在石英中确定可靠的扩散系数.
为了完善对状火山爆发所涉及的时间尺度的理解.

主要方法:

在石英晶体中分析的扩散配置,从Mt. 1991年皮纳图博火山喷发.
集成U-Th日期的含物与微尺度的扩散测量在石英.
将衍生的扩散数据应用于来自全球状火山岩的石英晶体.

主要成果:

为石英建立了新的,可靠的扩散系数.
证明了岩室再生和喷发之间的时间从几年到几千年不等.
确定了岩体积和原始化时间之间的正相关性,以及温度和原始化时间之间的负相关性.

结论:

产生状火山喷发的时间尺度比以前估计的要长得多.
这项研究提供了一种更准确的方法,用于使用石英中的扩散来限制岩过程持续时间.
了解这些长时间尺度对于评估火山风险和岩演变至关重要.

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Volatilization

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