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DOI | 10.1038/s41561-018-0084-x |
Accretion mode of oceanic ridges governed by axial mechanical strength | |
Sibrant, A. L. R.1,2; Mittelstaedt, E.1; Davaille, A.2; Pauchard, L.2; Aubertin, A.2; Auffray, L.2; Pidoux, R.2 | |
2018-04-01 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2018 |
卷号 | 11期号:4页码:274-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA; France |
英文摘要 | Oceanic spreading ridges exhibit structural changes as a function of spreading rate, mantle temperature and the balance of tectonic and magmatic accretion. The role that these or other processes have in governing the overall shape of oceanic ridges is unclear. Here, we use laboratory experiments to simulate ridge spreading in colloidal aqueous dispersions whose rheology evolves from purely viscous to elastic and brittle when placed in contact with a saline water solution. We find that ridge shape becomes increasingly linear with spreading rate until reaching a minimum tortuosity. This behaviour is predicted by the axial failure parameter Pi(F), a dimensionless number describing the balance of brittle and plastic failure of axial lithosphere. Slow-spreading, fault-dominated and fast-spreading, fluid intrusion-dominated ridges on Earth and in the laboratory are separated by the same critical Pi(F) value, suggesting that the axial failure mode governs ridge geometry. Values of Pi(F) can also be calculated for different mantle temperatures and applied to other planets or the early Earth. For higher mantle temperatures during the Archaean, our results preclude the predicted formation of large tectonic plates at high spreading velocity. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000429131600020 |
WOS关键词 | OVERLAPPING SPREADING CENTERS ; MID-ATLANTIC RIDGE ; MIDOCEAN RIDGE ; CRUSTAL THICKNESS ; TRANSFORM FAULTS ; CONVECTION ; SEGMENTATION ; DEPENDENCE ; MORPHOLOGY ; TOUGHNESS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/34686 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Univ Idaho, Dept Geol Sci, Moscow, ID 83843 USA; 2.Univ Paris Saclay, Univ Paris Sud, Lab FAST, CNRS, Orsay, France |
推荐引用方式 GB/T 7714 | Sibrant, A. L. R.,Mittelstaedt, E.,Davaille, A.,et al. Accretion mode of oceanic ridges governed by axial mechanical strength[J]. NATURE GEOSCIENCE,2018,11(4):274-+. |
APA | Sibrant, A. L. R..,Mittelstaedt, E..,Davaille, A..,Pauchard, L..,Aubertin, A..,...&Pidoux, R..(2018).Accretion mode of oceanic ridges governed by axial mechanical strength.NATURE GEOSCIENCE,11(4),274-+. |
MLA | Sibrant, A. L. R.,et al."Accretion mode of oceanic ridges governed by axial mechanical strength".NATURE GEOSCIENCE 11.4(2018):274-+. |
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