On the relationship between oxidation state and temperature of volcanic gas emissions
On the relationship between oxidation state and temperature of volcanic gas emissions
复制标题
火山气体排放氧化态与温度的关系
DOI：
10.1016/j.epsl.2019.05.036
复制
发表时间：
2019
影响因子：
5.3
通讯作者：
B. Scaillet
中科院分区：
文献类型：
--
作者：
Y. Moussallam;C. Oppenheimer;B. Scaillet
火山气体排放的氧化状态影响外逸层的组成和行星的可居住性。它被广泛认为与挥发物从中析出的熔体的氧化态有关。在这里，我们提出了一个全球综合的火山气体测量。我们定义的平均氧化态的火山气体排放在地球上的今天，并表明，在全球范围内，气体氧化态，相对于岩石缓冲区，是一个很强的函数的排放温度，增加了几个数量级的温度降低。这种趋势与熔体成分和地球动力学背景无关。这一观察结果可以解释为什么自太古代以来，地球上火山气体排放的平均氧化态明显增加，而熔体氧化态没有相应的变化。我们认为，渐进冷却的地幔和科马提岩代的停止应该伴随着大氧化事件的开始周围的火山气体的氧化态的大幅增加。这可能加速或促进了向富氧大气的过渡。总的来说，我们的数据，沿着与以前的工作，表明有没有单一或简单的地幔，岩浆和火山气体氧化还原状态之间的关系。
The oxidation state of volcanic gas emissions influences the composition of the exosphere and planetary habitability. It is widely considered to be associated with the oxidation state of the melt from which volatiles exsolve. Here, we present a global synthesis of volcanic gas measurements. We define the mean oxidation state of volcanic gas emissions on Earth today and show that, globally, gas oxidation state, relative to rock buffers, is a strong function of emission temperature, increasing by several orders of magnitude as temperature decreases. The trend is independent of melt composition and geodynamic setting. This observation may explain why the mean oxidation state of volcanic gas emissions on Earth has apparently increased since the Archean, without a corresponding shift in melt oxidation state. We argue that progressive cooling of the mantle and the cessation of komatiite generation should have been accompanied by a substantial increase of the oxidation state of volcanic gases around the onset of the Great Oxidation Event. This may have accelerated or facilitated the transition to an oxygen-rich atmosphere. Overall, our data, along with previous work, show that there are no single nor simple relationships between mantle-, magma- and volcanic gas-redox states.
影响因子：
3.9
作者：
R. S. Martin;T. Roberts;T. Mather;D. Pyle
通讯作者：
R. S. Martin;T. Roberts;T. Mather;D. Pyle
影响因子：
5.8
作者：
Aulbach, Sonja;Stagno, Vincenzo
通讯作者：
Stagno, Vincenzo
影响因子：
64.8
作者：
Berry, Andrew J.;Danyushevsky, Leonid V.;Sutton, Stephen R.
通讯作者：
Sutton, Stephen R.