DOI: 10.1038/ngeo3010
论文题名: Emergence of silicic continents as the lower crust peels off on a hot plate-tectonic Earth
作者: Chowdhury P. ; Gerya T. ; Chakraborty S.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 9 起始页码: 698
结束页码: 703
语种: 英语
Scopus关键词: continental crust
; crust
; crustal recycling
; geodynamics
; isostasy
; lower crust
; mafic rock
; plate convergence
; plate tectonics
; silica
; stabilization
; thermomechanics
英文摘要: The rock record and geochemical evidence indicate that continental recycling has been occurring since the early history of the Earth. The stabilization of felsic continents in place of Earth's early mafic crust about 3.0 to 2.0 billion years ago, perhaps due to the initiation of plate tectonics, implies widespread destruction of mafic crust during this time interval. However, the physical mechanisms of such intense recycling on a hotter, (late) Archaean and presumably plate-tectonic Earth remain largely unknown. Here we use thermomechanical modelling to show that extensive recycling via lower crustal peeling-off (delamination but not eclogitic dripping) during continent-continent convergence was near ubiquitous during the late Archaean to early Proterozoic. We propose that such destruction of the early mafic crust, together with felsic magmatism, may have caused both the emergence of silicic continents and their subsequent isostatic rise, possibly above the sea level. Such changes in the continental character have been proposed to influence the Great Oxidation Event and, therefore, peeling-off plate tectonics could be the geodynamic trigger for this event. A transition to the slab break-off controlled syn-orogenic recycling occurred as the Earth aged and cooled, leading to reduced recycling and enhanced preservation of the continental crust of present-day composition. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105709
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: Ruhr-Universität Bochum, Institut für Geologie, Mineralogie and Geophysik, Univertsitätsstrasse 150, Bochum, Germany; Swiss Federal Institute of Technology Zurich, Department of Earth Sciences, Sonneggstrasse 5, Zurich, Switzerland
Recommended Citation:
Chowdhury P.,Gerya T.,Chakraborty S.. Emergence of silicic continents as the lower crust peels off on a hot plate-tectonic Earth[J]. Nature Geoscience,2017-01-01,10(9)