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DOI | 10.1038/s41561-018-0217-2 |
Crustal inheritance and a top-down control on arc magmatism at Mount St Helens | |
Bedrosian, Paul A.1; Peacock, Jared R.2; Bowles-Martinez, Esteban3; Schultz, Adam3; Hill, Graham J.4 | |
2018-11-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2018 |
卷号 | 11期号:11页码:865-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA; New Zealand |
英文摘要 | In a subduction zone, the volcanic arc marks the location where magma, generated via flux melting in the mantle wedge, migrates through the crust and erupts. While the location of deep magma broadly defines the arc position, here we argue that crustal structures, identified in geophysical data from the Washington Cascades magmatic arc, are equally important in controlling magma ascent and defining the spatial distribution and compositional variability of erupted material. As imaged by a three-dimensional resistivity model, a broad lower-crustal mush zone containing 3-10% interconnected melt underlies this segment of the arc, interpreted to episodically feed upper-crustal magmatic systems and drive eruptions. Mount St Helens is fed by melt channelled around a mid-Tertiary batholith also imaged in the resistivity model and supported by potential-field data. Regionally, volcanism and seismicity are almost exclusive of the batholith, while at Mount St Helens, along its margin, the ascent of viscous felsic melt is enabled by deep-seated metasedimentary rocks. Both the anomalous forearc location and composition of St Helens magmas are products of this zone of localized extension along the batholith margin. This work is a compelling example of inherited structural control on local stress state and magmatism. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000448672100014 |
WOS关键词 | SOUTHERN WASHINGTON CASCADES ; MAGNETOTELLURIC DATA ; BENEATH ; TECTONICS ; RAINIER ; MARGIN ; MELT |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/34980 |
专题 | 地球科学 气候变化 |
作者单位 | 1.US Geol Survey, Box 25046, Denver, CO 80225 USA; 2.US Geol Survey, 345 Middlefield Rd, Menlo Pk, CA 94025 USA; 3.Oregon State Univ, Corvallis, OR 97331 USA; 4.Univ Canterbury, Gateway Antarctica, Christchurch, New Zealand |
推荐引用方式 GB/T 7714 | Bedrosian, Paul A.,Peacock, Jared R.,Bowles-Martinez, Esteban,et al. Crustal inheritance and a top-down control on arc magmatism at Mount St Helens[J]. NATURE GEOSCIENCE,2018,11(11):865-+. |
APA | Bedrosian, Paul A.,Peacock, Jared R.,Bowles-Martinez, Esteban,Schultz, Adam,&Hill, Graham J..(2018).Crustal inheritance and a top-down control on arc magmatism at Mount St Helens.NATURE GEOSCIENCE,11(11),865-+. |
MLA | Bedrosian, Paul A.,et al."Crustal inheritance and a top-down control on arc magmatism at Mount St Helens".NATURE GEOSCIENCE 11.11(2018):865-+. |
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