DOI: 10.1038/ngeo2525
论文题名: Cratonic root beneath North America shifted by basal drag from the convecting mantle
作者: Kaban M.K. ; Mooney W.D. ; Petrunin A.G.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期: 10 起始页码: 797
结束页码: 800
语种: 英语
Scopus关键词: Archean
; buoyancy
; continental drift
; craton
; drag
; lithosphere
; mantle convection
; numerical model
; tectonic evolution
; Superior Province
英文摘要: Stable continental cratons are the oldest geologic features on the planet. They have survived 3.8 to 2.5 billion years of Earth's evolution. The key to the preservation of cratons lies in their strong and thick lithospheric roots, which are neutrally or positively buoyant with respect to surrounding mantle. Most of these Archaean-aged cratonic roots are thought to have remained stable since their formation and to be too viscous to be affected by mantle convection. Here we use a combination of gravity, topography, crustal structure and seismic tomography data to show that the deepest part of the craton root beneath the North American Superior Province has shifted about 850 km to the west-southwest relative to the centre of the craton. We use numerical model simulations to show that this shift could have been caused by basal drag induced by mantle flow, implying that mantle flow can alter craton structure. Our observations contradict the conventional view of cratons as static, non-evolving geologic features. We conclude that there could be significant interaction between deep continental roots and the convecting mantle. © 2015 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/106164
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: Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Earth System Modelling, Telegrafenberg A20, Potsdam, Germany; US Geological Survey, MS 977, 345 Middlefield Rd., Menlo Park, CA, United States; Goethe University of Frankfurt, Institute of Geoscience, Altenhöferallee 1, Frankfurt am Main, Germany
Recommended Citation:
Kaban M.K.,Mooney W.D.,Petrunin A.G.. Cratonic root beneath North America shifted by basal drag from the convecting mantle[J]. Nature Geoscience,2015-01-01,8(10)