DOI: 10.1038/s41561-017-0051-y
论文题名: A Palaeoproterozoic tectono-magmatic lull as a potential trigger for the supercontinent cycle
作者: Spencer C.J. ; Murphy J.B. ; Kirkland C.L. ; Liu Y. ; Mitchell R.N.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2018
卷: 11, 期: 2 起始页码: 97
结束页码: 101
语种: 英语
Scopus关键词: carbon cycle
; continental crust
; geodynamics
; geological record
; igneous rock
; magmatism
; metamorphism
; oxygenation
; passive margin
; plate motion
; plate tectonics
; Proterozoic
; sedimentation
; supercontinent
英文摘要: The geologic record exhibits periods of active and quiescent geologic processes, including magmatism, metamorphism and mineralization. This apparent episodicity has been ascribed either to bias in the geologic record or fundamental changes in geodynamic processes. An appraisal of the global geologic record from about 2.3 to 2.2 billion years ago demonstrates a Palaeoproterozoic tectono-magmatic lull. During this lull, global-scale continental magmatism (plume and arc magmatism) and orogenic activity decreased. There was also a lack of passive margin sedimentation and relative plate motions were subdued. A global compilation of mafic igneous rocks demonstrates that this episode of magmatic quiescence was terminated about 2.2 billion years ago by a flare-up of juvenile magmatism. This post-lull magmatic flare-up is distinct from earlier such events, in that the material extracted from the mantle during the flare-up yielded significant amounts of continental material that amalgamated to form Nuna - Earth's first hemispheric supercontinent. We posit that the juvenile magmatic flare-up was caused by the release of significant thermal energy that had accumulated over some time. This flux of mantle-derived energy could have provided a mechanism for dramatic growth of continental crust, as well as the increase in relative plate motions required to complete the transition to modern plate tectonics and the supercontinent cycle. These events may also be linked to Palaeoproterozoic atmospheric oxygenation and equilibration of the carbon cycle. © 2018 Macmillan Publishers Limited, part of Springer Nature 2018. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105615
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: Earth Dynamics Research Group, Institute for Geoscience Research, Department of Applied Geology, Curtin University, Perth, WA, Australia; Department of Earth Sciences, St. Francis Xavier University, Antigonish, NS, Canada; Centre for Exploration Targeting - Curtin Node, Department of Applied Geology, Curtin University, Perth, WA, Australia; School of Earth and Planetary Sciences, Curtin University, Perth, WA, Australia
Recommended Citation:
Spencer C.J.,Murphy J.B.,Kirkland C.L.,et al. A Palaeoproterozoic tectono-magmatic lull as a potential trigger for the supercontinent cycle[J]. Nature Geoscience,2018-01-01,11(2)