The Ins and Outs of Water in Olivine-Hosted Melt Inclusions: Hygrometer vs. Speedometer
The Ins and Outs of Water in Olivine-Hosted Melt Inclusions: Hygrometer vs. Speedometer
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橄榄石熔融包裹体中水的来龙去脉：湿度计与车速计
DOI：
10.3389/feart.2021.614004
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发表时间：
2021
期刊：
影响因子：
5.8
通讯作者：
T. Plank
中科院分区：
文献类型：
--
作者：
A. Barth;T. Plank
由于水对岩浆生成、粘度和浮力的主导控制，溶解在火山深处岩浆中的水量对各种岩浆和喷发过程至关重要。由于岩浆在上升和喷发时脱气了大部分初始水含量，岩浆水演化的主要记录存在于晶体（特别是橄榄石）中的熔体包裹体中。然而，通过橄榄石的快速H+扩散的发现提出了质疑的熔体包裹体水记录的保真度。现有的和不断增长的熔融包裹体水含量的庞大数据集受到多大的损害？什么样的环境有利于记录原始或喷发前的水浓度？即使包裹体受到损害，也可以利用扩散失水来限制岩浆减压速率，这是影响导管过程的一个关键参数。在这里，我们概述了目前的理解控制水分流失的因素：橄榄石/熔体分配系数，水通过橄榄石的扩散运输，包裹体和晶体边缘之间的距离，熔体包裹体的大小，和外部岩浆的水演化。我们将这些参数联合收割机组合成一个状态图，该状态图可用于指导熔体包裹体何时可用作湿度计，何时更适合用作岩浆速度计。我们开发诊断工具，以识别在哪里和何时发生的水损失在岩浆的上升历史，我们概述了定量工具，可用于恢复的主要和/或喷发前的水含量。本文的目的是指导研究人员在现有的熔体包裹体数据的解释，并帮助设计新的研究，最大限度地提高有价值的信息，熔体包裹体可能传达的水在岩浆喷发前的演变。
The amount of water dissolved in magmas at depth beneath volcanoes is fundamental to a wide range of magmatic and eruptive processes due to water’s dominant control on magma generation, viscosity, and buoyancy. Since magmas degas most of their initial water content upon ascent and eruption, the primary record of magmatic water evolution exists within melt inclusions trapped inside crystals, especially olivine. However, the discovery of rapid H+ diffusion through olivine has called into question the fidelity of the melt inclusion water record. How compromised is the vast existing and growing dataset of melt inclusion water contents? What are the circumstances favorable for recording primary or pre-eruptive water concentration? Even if inclusions are compromised, diffusive water loss can be exploited to constrain magma decompression rates, a critical parameter that affects conduit processes. Here, we outline the current understanding of factors controlling water loss: the olivine/melt partition coefficient, the diffusive transport of water through olivine, the distance between inclusion and crystal rim, the melt inclusion size, and the exterior magma’s water evolution. We combine these parameters into a regime diagram that can be used to guide when melt inclusions may be used as hygrometers and when they are better suited to act as magma speedometers. We develop diagnostic tools to recognize where and when water loss has occurred in a magma’s ascent history, and we outline quantitative tools that may be used to restore the primary and/or pre-eruptive water content. The intent of this paper is to guide researchers in the interpretation of existing melt inclusion data, and to aid in the design of new studies that maximize the valuable information that melt inclusions may convey on the evolution of water in magmas prior to eruption.
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橄榄石熔融包裹体：复杂岩浆世界的微观视角
DOI：
10.1146/annurev-earth-082420-060506
发表时间：
2021
影响因子：
14.9
作者：
Wallace, Paul J.;Plank, Terry;Bodnar, Robert J.;Gaetani, Glenn A.;Shea, Thomas
通讯作者：
Shea, Thomas
影响因子：
5.3
作者：
Blundy, Jonathan;Cashman, Katharine V.;Witham, Fred
通讯作者：
Witham, Fred
影响因子：
3.5
作者：
S. Sadofsky;M. Portnyagin;K. Hoernle;P. Bogaard
通讯作者：
S. Sadofsky;M. Portnyagin;K. Hoernle;P. Bogaard
影响因子：
5
作者：
E. Ferriss;T. Plank;M. Newcombe;D. Walker;E. Hauri
通讯作者：
E. Ferriss;T. Plank;M. Newcombe;D. Walker;E. Hauri
影响因子：
16.6
作者：
Ruth DCS;Costa F;Bouvet de Maisonneuve C;Franco L;Cortés JA;Calder ES
通讯作者：
Calder ES