| DOI: | 10.1038/ngeo2208
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| 论文题名: | Mixing at mid-ocean ridges controlled by small-scale convection and plate motion |
| 作者: | Samuel H.; King S.D.
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| 刊名: | Nature Geoscience
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| ISSN: | 17520894
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| 出版年: | 2014
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| 卷: | 7, 期:8 | | 起始页码: | 602
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| 结束页码: | 605
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| 语种: | 英语
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| 英文摘要: | Oceanic lavas are thought to be derived from different sources within the Earth's mantle, each with a distinct composition. Large-scale plate motions provide the primary mechanism for mixing these sources, yet the geochemical signature of lavas erupted at different mid-ocean ridges can still vary significantly. Geochemical variability is low where plate spreading rates are high, consistent with plate-scale mixing. However, slow-spreading centres, such as the Southwest Indian Ridge in the Indian Ocean, are also geochemically homogeneous, which is inconsistent with plate-scale mixing. Here we use numerical simulations of mantle flow to study mantle mixing at mid-ocean ridges, under conditions with variable plate length and spreading rate. Our simulations reveal that small-scale convection in the mantle contributes significantly to mantle mixing at slow spreading rates; faster plate velocities and smaller plates inhibit small-scale convection. We conclude that whereas fast-spreading ridge lavas are well mixed by plate-scale flow, slow-spreading ridge lavas are mixed by small-scale convection. © 2014 Macmillan Publishers Limited. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/106484
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| 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: | CNRS, IRAP, 14, avenue Edouard Belin, F-31400 Toulouse, France; Université de Toulouse, UPS-OMP, IRAP, F-31400 Toulouse, France; Bayerisches Geoinstitut, Universität Bayreuth, D-95447 Bayreuth, Germany; Virginia Tech, Blacksburg, VA 24060, United States
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| Recommended Citation: | |
Samuel H.,King S.D.. Mixing at mid-ocean ridges controlled by small-scale convection and plate motion[J]. Nature Geoscience,2014-01-01,7(8)
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