DOI: 10.1038/ngeo2959
论文题名: Lifetime and size of shallow magma bodies controlled by crustal-scale magmatism
作者: Karakas O. ; Degruyter W. ; Bachmann O. ; Dufek J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 6 起始页码: 446
结束页码: 450
语种: 英语
Scopus关键词: explosive
; heat budget
; magma
; magma chamber
; magmatism
; numerical model
; reservoir
; upper crust
; volcanic eruption
英文摘要: Magmatic processes on Earth govern the mass, energy and chemical transfer between the mantle, crust and atmosphere. To understand magma storage conditions in the crust that ultimately control volcanic activity and growth of continents, an evaluation of the mass and heat budget of the entire crustal column during magmatic episodes is essential. Here we use a numerical model to constrain the physical conditions under which both lower and upper crustal magma bodies form. We find that over long durations of intrusions (greater than 105 to 106 yr), extensive lower crustal mush zones develop, which modify the thermal budget of the upper crust and reduce the flux of magma required to sustain upper crustal magma reservoirs. Our results reconcile physical models of magma reservoir construction and field-based estimates of intrusion rates in numerous volcanic and plutonic localities. Young igneous provinces (less than a few hundred thousand years old) are unlikely to support large upper crustal reservoirs, whereas longer-lived systems (active for longer than 1 million years) can accumulate magma and build reservoirs capable of producing super-eruptions, even with intrusion rates smaller than 10-3 to 10-2 km3 yr-1. Hence, total duration of magmatism should be combined with the magma intrusion rates to assess the capability of volcanic systems to form the largest explosive eruptions on Earth. © 2017 Macmillan Publishers Limited, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105774
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Earth Sciences, Institute of Geochemistry and Petrology, ETH Zurich, Clausiusstrasse 25, Zurich, Switzerland; School of Earth and Ocean Sciences, Cardiff University, Main Building, Park Place, Cardiff, United Kingdom; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA, United States
Recommended Citation:
Karakas O.,Degruyter W.,Bachmann O.,et al. Lifetime and size of shallow magma bodies controlled by crustal-scale magmatism[J]. Nature Geoscience,2017-01-01,10(6)