DOI: 10.1038/ngeo2264
论文题名: North Atlantic magmatism controlled by temperature, mantle composition and buoyancy
作者: Brown E.L. ; Lesher C.E.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 11 起始页码: 820
结束页码: 824
语种: 英语
Scopus关键词: buoyancy
; lava
; magmatism
; mantle chemistry
; Paleogene
; plate motion
; plume
; temperature effect
; Atlantic Ocean
; Atlantic Ocean (North)
英文摘要: Large igneous provinces are characterized by anomalously high rates ofmagmaproduction1. Such voluminous magmatism is commonly attributed to partial melting of hot, buoyantly upwelling mantle plume material2,3. However, compositional heterogeneity in the mantle, caused by the subduction of oceanic crust, can also enhancemagmaproduction, diminishing the need for elevated temperatures associated with upwelling plumes4,5. A plume origin for the North Atlantic large igneous province has been questioned because lava compositions correlate with crustal thickness, implying a link between magmaproductivity and mantle source composition4,6. Herewe use a numerical model that simulates upwelling and melting of compositionally heterogeneous mantle material to constrain the conditions that gave rise to magmatism in the North Atlantic. Using observations of lava compositions and volumes from the North Atlantic, we show that subducted crustal material represented less than 10% of the mantle source. We further showthat mantle temperatures have remained elevated by 85-210 °C and increased mantle upwelling up to 14 times the rate of plate separation has occurred over the past 56Myr. The enhanced temperatures and upwelling rates extended along more than 1,000 km of the Palaeogene rift, but are substantially more restricted along the modern Mid-Atlantic Ridge. These findings reflect the long-term manifestation of a mantle plume. © 2014 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106385
Appears in Collections: 气候减缓与适应 科学计划与规划
There are no files associated with this item.
作者单位: Department of Earth and Planetary Sciences, University of California Davis, One Shields Avenue, Davis, California, United States; Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, Aarhus C, Denmark
Recommended Citation:
Brown E.L.,Lesher C.E.. North Atlantic magmatism controlled by temperature, mantle composition and buoyancy[J]. Nature Geoscience,2014-01-01,7(11)