Quartz-hosted inclusions and embayments reveal storage, fluxing, and ascent of the Mesa Falls Tuff, Yellowstone
Quartz-hosted inclusions and embayments reveal storage, fluxing, and ascent of the Mesa Falls Tuff, Yellowstone
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石英内含物和海湾揭示了黄石公园梅萨瀑布凝灰岩的储存、流动和上升
DOI：
10.1016/j.epsl.2022.117909
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发表时间：
2023
影响因子：
5.3
通讯作者：
Thompson, James O.
中科院分区：
文献类型：
--
作者：
Befus, Kenneth S.;Ruefer, Anna C.;Allison, Chelsea M.;Thompson, James O.
来自梅萨瀑布凝灰岩的石英玻璃提供了一个地球化学窗口，可以从黄石公园最大的火山口形成火山之一中了解爆发前的岩浆系统。在同一石英晶体中，测量了完全封闭的玻璃包裹体和部分封闭的玻璃包裹体中的H2O和co2浓度以及主要和微量元素。除了K2O和Na2O外，包裹体和包裹体的主要元素基本一致。值得注意的是，相对于包裹体，K2O在包裹体内部富集了~ 1 wt.%。与来自同一晶体的包裹体相比，大多数微量元素在镶嵌物内部也富集。微量元素的分馏趋势与~ 30 ~ 60%结晶一致。石英承载的玻璃内含物保存3.1±0.9 wt.% H2O和493±227 ppm CO2，而镶嵌内部有0.9±0.1 wt.% H2O和399±229 ppm CO2。co2大致相似，但包裹体和嵌套内部H2O含量之间明显的~ 2 wt.%的差异可能是由来自下镀黄石玄武岩的co2助熔剂产生的。火山口内的水梯度在其内部是平坦的，而在火山口外附近由于火山喷发后的再水合作用而产生了急剧的正梯度。co2梯度呈平缓倾斜的浓度梯度，向内延伸150 ~ 250 μm。有限差分一维和二维扩散模拟表明，在形成火山口的喷发过程中，在快速上升之前，缓慢的流体饱和减压产生了H2O和co2的分布。
Quartz-hosted glasses from the Mesa Falls Tuff provide a geochemical window into the pre-eruptive magmatic system from one of Yellowstone's largest-volume caldera-forming eruptions. H2O and CO2concentrations, along with major and trace elements, were measured in both fully enclosed glass inclusions and partially enclosed embayments in the same quartz crystals. Major elements are largely consistent between the inclusions and embayments, except for K2O and Na2O. Of note, K2O is enriched by ∼1 wt.% in embayment interiors relative to inclusions. Most trace elements are also enriched in the embayment interiors compared to inclusions from the same crystals. Fractionation trends of trace elements are consistent with ∼30-60% crystallization. Quartz-hosted glass inclusions preserve 3.1±0.9 wt.% H2O and 493±227 ppm CO2whereas embayment interiors have 0.9±0.1 wt.% H2O and 399±229 ppm CO2. The CO2is roughly similar, but the distinct ∼2 wt.% discrepancy between inclusion and embayment interior H2O contents may have been produced by CO2fluxing sourced from underplated Yellowstone basalts. H2O gradients within embayments are flat in their interiors and modified by sharp positive gradients near embayment exteriors which were produced by post-eruptive rehydration. CO2gradients occur as gently sloping concentration gradients that extend inward 150 to 250 μm from the embayment exterior. Finite-difference 1D and 2D diffusion modeling indicates the distribution of H2O and CO2in embayments was produced by slow, fluid-saturated decompression that preceded rapid ascent during the caldera-forming eruption.
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影响因子：
3.5
作者：
Ferguson, David J.;Gonnermann, Helge M.;Swanson, Donald A.
通讯作者：
Swanson, Donald A.
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影响因子：
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作者：
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影响因子：
5.3
作者：
M. Myers;P. Wallace;C. Wilson;B. K. Morter;Elliot J. Swallow
通讯作者：
Elliot J. Swallow
影响因子：
7.9
作者：
Geshi, Nobuo;Yamasaki, Tadashi;Conway, Chris E.
通讯作者：
Conway, Chris E.
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影响因子：
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作者：
N. Spilliaert;P. Allard;N. Métrich;A. Sobolev
通讯作者：
A. Sobolev