DOI: 10.1038/ngeo2622
论文题名: Massive and prolonged deep carbon emissions associated with continental rifting
作者: Lee H. ; Muirhead J.D. ; Fischer T.P. ; Ebinger C.J. ; Kattenhorn S.A. ; Sharp Z.D. ; Kianji G.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 2 起始页码: 145
结束页码: 149
语种: 英语
Scopus关键词: carbon dioxide
; carbon emission
; carbon isotope
; continental breakup
; Cretaceous
; degassing
; emission inventory
; extensional tectonics
; fault
; flux measurement
; greenhouse gas
; isotopic analysis
; lower crust
; magma
; mantle
; mid-ocean ridge
; rifting
; seismicity
; soil emission
; volcanic gas
; Arusha [Tanzania]
; Kajiado
; Kenya
; Lake Magadi
; Lake Natron
; Tanzania
英文摘要: Carbon from Earth's interior is thought to be released to the atmosphere mostly via degassing of CO2 from active volcanoes. CO2 can also escape along faults away from active volcanic centres, but such tectonic degassing is poorly constrained. Here we use measurements of diffuse soil CO2, combined with carbon isotopic analyses to quantify the flux of CO2 through fault systems away from active volcanoes in the East African Rift system. We find that about 4 Mt yr-1 of mantle-derived CO2 is released in the Magadi-Natron Basin, at the border between Kenya and Tanzania. Seismicity at depths of 15-30 km implies that extensional faults in this region may penetrate the lower crust. We therefore suggest that CO2 is transferred from upper-mantle or lower-crustal magma bodies along these deep faults. Extrapolation of our measurements to the entire Eastern rift of the rift system implies a CO2 flux on the order of tens of megatonnes per year, comparable to emissions from the entire mid-ocean ridge system of 53-97 Mt yr-1. We conclude that widespread continental rifting and super-continent breakup could produce massive, long-term CO2 emissions and contribute to prolonged greenhouse conditions like those of the Cretaceous. © 2016 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106092
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 and Planetary Sciences, University of New Mexico, Albuquerque, NM, United States; Department of Geological Sciences, University of Idaho, Moscow, ID, United States; Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY, United States; ConocoPhillips, Houston, TX, United States; Department of Geology, Chiromo Campus, University of Nairobi, PO Box 30197, Nairobi, Kenya
Recommended Citation:
Lee H.,Muirhead J.D.,Fischer T.P.,et al. Massive and prolonged deep carbon emissions associated with continental rifting[J]. Nature Geoscience,2016-01-01,9(2)