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DOI | 10.1038/s41561-019-0415-6 |
Optimal depth of subvolcanic magma chamber growth controlled by volatiles and crust rheology | |
Huber, Christian1; Townsend, Meredith1,2; Degruyter, Wim3; Bachmann, Olivier4 | |
2019-09-01 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2019 |
卷号 | 12期号:9页码:762-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Wales; Switzerland |
英文摘要 | Storage pressures of magma chambers influence the style, frequency and magnitude of volcanic eruptions. Neutral buoyancy or rheological transitions are commonly assumed to control where magmas accumulate and form such chambers. However, the density of volatile-rich silicic magmas is typically lower than that of the surrounding crust, and the rheology of the crust alone does not define the depth of the brittle-ductile transition around a magma chamber. Yet, typical storage pressures inferred from geophysical inversions or petrological methods seem to cluster around 2 +/- 0.5 kbar in all tectonic settings and crustal compositions. Here, we use thermomechanical modelling to show that storage pressure is controlled by volatile exsolution and crustal rheology. At pressures less than or similar to 1.5 kbar, and for geologically realistic water contents, chamber volumes and recharge rates, the presence of an exsolved magmatic volatile phase hinders chamber growth because eruptive volumes are typically larger than recharges feeding the system during periods of dormancy. At pressures > rsim2.5 kbar, the viscosity of the crust in long-lived magmatic provinces is sufficiently low to inhibit most eruptions. Sustainable eruptible magma reservoirs are able to develop only within a relatively narrow range of pressures around 2 +/- 0.5 kbar, where the amount of exsolved volatiles fosters growth while the high viscosity of the crust promotes the necessary overpressurization for eruption. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000484058100018 |
WOS关键词 | MOUNT ST-HELENS ; LAGUNA DEL MAULE ; MELT INCLUSIONS ; EXPERIMENTAL CALIBRATION ; SILICIC MAGMAS ; VOLCANIC FIELD ; ARC MAGMATISM ; EXSOLVED GAS ; ERUPTION ; PRESSURES |
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/186888 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Brown Univ, Dept Earth Environm & Planetary Sci, Providence, RI 02912 USA; 2.Univ Oregon, Dept Earth Sci, Eugene, OR 97403 USA; 3.Cardiff Univ, Sch Earth & Ocean Sci, Cardiff, S Glam, Wales; 4.Swiss Fed Inst Technol, Dept Earth Sci, Zurich, Switzerland |
推荐引用方式 GB/T 7714 | Huber, Christian,Townsend, Meredith,Degruyter, Wim,et al. Optimal depth of subvolcanic magma chamber growth controlled by volatiles and crust rheology[J]. NATURE GEOSCIENCE,2019,12(9):762-+. |
APA | Huber, Christian,Townsend, Meredith,Degruyter, Wim,&Bachmann, Olivier.(2019).Optimal depth of subvolcanic magma chamber growth controlled by volatiles and crust rheology.NATURE GEOSCIENCE,12(9),762-+. |
MLA | Huber, Christian,et al."Optimal depth of subvolcanic magma chamber growth controlled by volatiles and crust rheology".NATURE GEOSCIENCE 12.9(2019):762-+. |
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