期刊
SCIENCE BULLETIN
卷 66, 期 16, 页码 1691-1697出版社
ELSEVIER
DOI: 10.1016/j.scib.2021.04.028
关键词
Pacific plate; Emperor-Hawaii chain; Plume-ridge interaction; Geochemistry; Numerical modeling
资金
- National Key Research & Development Program of China [2016YFC0600408]
- Strategic Priority Research Program (B) of the Chinese Academy of Sciences [XDB18020000]
- Programme National de Planetologie (PNP) of the Institut des Sciences de l'Univers (INSU) of the French National Centre for Scientific Research (CNRS)
- French Space Centre (CNES) [BFC 221950]
The study highlights the inconsistency between the volcanic migration rates of the Emperor seamounts and the drifting rate of the Pacific plate, indicating significant northward and southward absolute movements of the seamounts. Numerical modeling suggests that this may be due to the attraction and capture of the upper part of the plume by a moving spreading ridge.
The history of the Hawaiian hotspot is of enduring interest in studies of plate motion and mantle flow, and has been investigated by many researchers using the detailed history of the Hawaiian-Emperor Seamount chain. One of the unexplained aspects of this history is the apparent offset of several Emperor seamounts from the Hawaii plume track. Here we show that the volcanic migration rates of the Emperor seamounts based on existing data are inconsistent with the drifting rate of the Pacific plate, and indicate northward and then southward absolute movements of the seamounts. Numerical modeling suggests that attraction and capture of the upper part of the plume by a moving spreading ridge led to variation in the location of the plume's magmatic output at the surface. Flow of the plume material towards the ridge led to apparent southward movement of Meiji. Then, the upper part of the plume was carried northward until 65 Ma ago. After the ridge and the plume became sufficiently separated, magmatic output moved back to be centered over the plume stem. These changes are apparent in variations in the volume of seamounts along the plume track. Chemical and isotopic compositions of basalt from the Emperor Seamount chain changed from depleted (strong mid-ocean ridge affinity) in Meiji and Detroit to enriched (ocean island type), supporting declining influence from the ridge. Although its surface expression was modified by mantle flow and by plume-ridge interactions, the stem of the Hawaiian plume may have been essentially stationary during the Emperor period. (c) 2021 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据