Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1714125115 |
Chemical trends in ocean islands explained by plume-slab interaction | |
Dannberg, Juliane1,2,3; Gassmoller, Rene1,2,3 | |
2018-04-24 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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ISSN | 0027-8424 |
出版年 | 2018 |
卷号 | 115期号:17页码:4351-4356 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Earth's surface shows many features, of which the genesis can be understood only through their connection with processes in Earth's deep interior. Recent studies indicate that spatial geochemical patterns at oceanic islands correspond to structures in the lowermost mantle inferred from seismic tomographic models. This suggests that hot, buoyant upwellings can carry chemical heterogeneities from the deep lower mantle toward the surface, providing a window to the composition of the lowermost mantle. The exact nature of this link between surface and deep Earth remains debated and poorly understood. Using computational models, we show that subducted slabs interacting with dense thermochemical piles can trigger the ascent of hot plumes that inherit chemical gradients present in the lowermost mantle. We identify two key factors controlling this process: (i) If slabs induce strong lower-mantle flow toward the edges of these piles where plumes rise, the pile-facing side of the plume preferentially samples material originating from the pile, and bilaterally asymmetric chemical zoning develops. (ii) The composition of the melt produced reflects this bilateral zoning if the overlying plate moves roughly perpendicular to the chemical gradient in the plume conduit. Our results explain some of the observed geochemical trends of oceanic islands and provide insights into how these trends may originate. |
英文关键词 | mantle plumes hotspots bilateral zoning geodynamic modeling plume generation zones |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000430697500049 |
WOS关键词 | HAWAIIAN MANTLE PLUME ; LEAD ISOTOPES REVEAL ; DEEP-MANTLE ; VELOCITY PROVINCES ; INTERNAL STRUCTURE ; HOTSPOT TRACK ; CONVECTION ; ASYMMETRY ; DYNAMICS ; TRISTAN |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
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/204903 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Colorado State Univ, Dept Math, Ft Collins, CO 80523 USA; 2.Texas A&M Univ, Dept Math, College Stn, TX 77843 USA; 3.Univ Calif Davis, Dept Earth & Planetary Sci, Davis, CA 95616 USA |
推荐引用方式 GB/T 7714 | Dannberg, Juliane,Gassmoller, Rene. Chemical trends in ocean islands explained by plume-slab interaction[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2018,115(17):4351-4356. |
APA | Dannberg, Juliane,&Gassmoller, Rene.(2018).Chemical trends in ocean islands explained by plume-slab interaction.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(17),4351-4356. |
MLA | Dannberg, Juliane,et al."Chemical trends in ocean islands explained by plume-slab interaction".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.17(2018):4351-4356. |
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