Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2021GL092884 |
Using Chemical Affinities to Understand Disequilibrium Textures of Plagioclase Preserved in Magmatic Systems | |
Ellyn G. Huggins; Philipp Ruprecht; Mark S. Ghiorso | |
2021-05-11 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2021 |
英文摘要 | Volcanic textures are strongly related to magma ascent histories. Degassing of a volatile‐rich magma can drive plagioclase microlite growth on eruptive timescales, but such growth can be inhibited when ascent is sufficiently fast. Thus, the absence of microlites is used to determine minimum ascent rates. However, open‐system processes, such as magma recharge, prior to decompression can also suppress microlite growth, possibly extending the timescales for ascent. Here, we explore the trade‐offs between degassing‐driven growth and reheating‐driven suppression of microlite formation. We develop a quantitative model on the basis of the chemical affinity that accounts for disequilibrium driving crystal growth or dissolution. We test decompression scenarios to understand how net‐crystallization varies with different pressure‐temperature ascent histories for the 2008 Chaitén eruption. Degassing‐driven growth and reheating‐driven dissolution are balanced for ascent rates of 0.002‐0.006 MPa/s (∼0.08‐0.25 m/s) from 200 MPa storage depth and reheating by 50‐70 ˚C, significantly reducing minimum ascent rates. |
领域 | 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/326752 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Ellyn G. Huggins,Philipp Ruprecht,Mark S. Ghiorso. Using Chemical Affinities to Understand Disequilibrium Textures of Plagioclase Preserved in Magmatic Systems[J]. Geophysical Research Letters,2021. |
APA | Ellyn G. Huggins,Philipp Ruprecht,&Mark S. Ghiorso.(2021).Using Chemical Affinities to Understand Disequilibrium Textures of Plagioclase Preserved in Magmatic Systems.Geophysical Research Letters. |
MLA | Ellyn G. Huggins,et al."Using Chemical Affinities to Understand Disequilibrium Textures of Plagioclase Preserved in Magmatic Systems".Geophysical Research Letters (2021). |
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