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DOI | 10.1029/2020GL090612 |
Seismic Evidence of Bottom‐Up Crustal Control on Volcanism and Magma Storage near Mount St. Helens | |
E. Kiser; A. Levander; B. Schmandt; S. Hansen | |
2021-02-01 | |
发表期刊 | Geophysical Research Letters
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出版年 | 2021 |
英文摘要 | The lower crust has long been recognized as a place where significant chemical evolution of magma occurs. Understanding the conditions that lead to long‐term storage in or rapid transport through these lower crustal systems has remained a challenge. In this study, active‐source seismic data are processed to image prominent reflectors in the lower crust and upper mantle near Mount St. Helens. Results show strong and weak near‐Moho reflectivity located near previously inferred regions of magma storage and high‐density bodies underlying volcanic centers, respectively. To explain these observations, we hypothesize that magmas intersecting the high‐density lower crustal bodies experience enhanced vertical buoyancy forces/transport due to the increased density contrast between melt and host rock. The reduced reflectivity near high‐density bodies is therefore a result of both decreased impedance contrasts between crust and mantle host rocks and diminished lower crust magma accumulation, which ultimately causes focusing of volcanism above these features. This article is protected by copyright. All rights reserved. |
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/313842 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | E. Kiser,A. Levander,B. Schmandt,等. Seismic Evidence of Bottom‐Up Crustal Control on Volcanism and Magma Storage near Mount St. Helens[J]. Geophysical Research Letters,2021. |
APA | E. Kiser,A. Levander,B. Schmandt,&S. Hansen.(2021).Seismic Evidence of Bottom‐Up Crustal Control on Volcanism and Magma Storage near Mount St. Helens.Geophysical Research Letters. |
MLA | E. Kiser,et al."Seismic Evidence of Bottom‐Up Crustal Control on Volcanism and Magma Storage near Mount St. Helens".Geophysical Research Letters (2021). |
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