DOI: 10.1038/s41561-020-00673-1
论文题名: Archaean seafloors shallowed with age due to radiogenic heating in the mantle
作者: Rosas J.C. ; Korenaga J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
卷: 14, 期: 1 起始页码: 51
结束页码: 56
语种: 英语
英文关键词: age determination
; Archean
; concentration (composition)
; continental crust
; early Earth
; heating
; mantle
; mantle convection
; oceanic lithosphere
; radionuclide
; seafloor
; seamount
; volcanic island
; Trachinotus falcatus
英文摘要: Given the scarcity of geological data, knowledge of Earth’s landscape during the Archaean eon is limited. Although the continental crust may have been as massive as present by 4 Gyr ago, the extent to which it was submerged or exposed is unclear. One key component in understanding the amount of exposed landmasses in the early Earth is the evolution of the oceanic lithosphere. Whereas the present-day oceanic lithosphere subsides as it ages, based on numerical models of mantle convection we find that higher internal heating due to a larger concentration of radioactive isotopes in the Archaean mantle halted subsidence, possibly inducing seafloor shallowing before 2.5 Gyr ago. In such a scenario, exposed landmasses in the form of volcanic islands and resurfaced seamounts or oceanic plateaus can remain subaerial for extended periods of time, and may have provided the only stable patches of dryland in the Archaean. Our results therefore permit a re-evaluation of possible locations for the origin of life, as they provide support to an existing hypothesis that suggests that life had its origins on land rather than in an oceanic environment. © 2021, The Author(s), under exclusive licence to Springer Nature Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169809
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth and Planetary Sciences, Yale University, New Haven, CT, United States; Departamento de Geofísica Aplicada, Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Mexico
Recommended Citation:
Rosas J.C.,Korenaga J.. Archaean seafloors shallowed with age due to radiogenic heating in the mantle[J]. Nature Geoscience,2021-01-01,14(1)