globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo3007
论文题名:
Abundant carbon in the mantle beneath Hawai'i
作者: Anderson K.R.; Poland M.P.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期:9
起始页码: 704
结束页码: 708
语种: 英语
Scopus关键词: Bayesian analysis ; carbon ; carbon cycle ; carbon dioxide ; concentration (composition) ; helium isotope ; mantle source ; mantle structure ; tracer ; volcanic eruption ; Hawaii [United States] ; United States
英文摘要: Estimates of carbon concentrations in Earth's mantle vary over more than an order of magnitude, hindering our ability to understand mantle structure and mineralogy, partial melting, and the carbon cycle. CO2 concentrations in mantle-derived magmas supplying hotspot ocean island volcanoes yield our most direct constraints on mantle carbon, but are extensively modified by degassing during ascent. Here we show that undegassed magmatic and mantle carbon concentrations may be estimated in a Bayesian framework using diverse geologic information at an ocean island volcano. Our CO2 concentration estimates do not rely upon complex degassing models, geochemical tracer elements, assumed magma supply rates, or rare undegassed rock samples. Rather, we couple volcanic CO2 emission rates with probabilistic magma supply rates, which are obtained indirectly from magma storage and eruption rates. We estimate that the CO2 content of mantle-derived magma supplying Hawai'i's active volcanoes is 0.97-0.19+0.25 wt%-roughly 40% higher than previously believed-and is supplied from a mantle source region with a carbon concentration of 263-62+81 ppm. Our results suggest that mantle plumes and ocean island basalts are carbon-rich. Our data also shed light on helium isotope abundances, CO2/Nb ratios, and may imply higher CO2 emission rates from ocean island volcanoes. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105720
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: US Geological Survey, 345 Middlefield Rd, Menlo Park, CA, United States; US Geological Survey, 1300 SE Cardinal Ct, Vancouver, WA, United States

Recommended Citation:
Anderson K.R.,Poland M.P.. Abundant carbon in the mantle beneath Hawai'i[J]. Nature Geoscience,2017-01-01,10(9)
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