Global scale patterns of continental fragmentation: Wilson's cycles as a constraint for long-term sea-level changes

被引:29
作者
Cogne, Jean-Pascal [1 ]
Humler, Eric [2 ]
机构
[1] Univ Paris Diderot, IPG, CNRS, Equipe Paleomagnetisme, F-75005 Paris, France
[2] Univ Nantes, Lab Planetol & Geodynam, CNRS, F-44000 Nantes, France
关键词
Paleomagnetic reconstructions; continental breakup; seafloor mean age; sea-level; Neoproterozoic; Phanerozoic;
D O I
10.1016/j.epsl.2008.06.030
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
We propose to characterize land-ocean distributions over Late Proterozoic to Phanerozoic times from measurement of perimeters and areas of continental fragments, based on paleomagnetic reconstructions. These measurements serve to calculate geophysically constrained breakup and scatter indexes of continental land masses from 0 to 1100 Ma. We then provide quantitative investigation and modelling of relationships between scatter of continental landmasses and mean age of the oceanic lithosphere during Mesozoic times, which appears to range from 56 to 62 Ma over the last 170 My. We then inverse the scatter of continental landmasses in terms of global oceanic crust mean age over the last 600 My, i.e. back in times where no measurement of seafloor accretion history is possible because of subduction. We finally show that the inferred evolution of oceanic lithosphere mean age over the Phanerozoic remarkably correlates in time with long-term sea-level changes since the Cambrian. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:251 / 259
页数:9
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