DOI: 10.1038/ngeo2063
论文题名: Mapping the mass distribution of Earth's mantle using satellite-derived gravity gradients
作者: Panet I. ; Pajot-Métivier G. ; Greff-Lefftz M. ; Métivier L. ; Diament M. ; Mandea M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 2 起始页码: 131
结束页码: 135
语种: 英语
Scopus关键词: geodynamics
; GOCE
; gravity anomaly
; mantle chemistry
; mantle convection
; seismic tomography
; tectonic plate
; upper mantle
英文摘要: The dynamics of Earth's mantle are not well known. Deciphering mantle flow patterns requires an understanding of the global distribution of mantle density. Seismic tomography has been used to derive mantle density distributions, but converting seismic velocities into densities is not straightforward. Here we show that data from the GOCE (Gravity field and steady-state Ocean Circulation Explorer) mission can be used to probe our planet's deep mass structure. We construct global anomaly maps of the Earth's gravitational gradients at satellite altitude and use a sensitivity analysis to show that these gravitational gradients image the geometry of mantle mass down to mid-mantle depths. Our maps highlight north-south-elongated gravity gradient anomalies over Asia and America that follow a belt of ancient subduction boundaries, as well as gravity gradient anomalies over the central Pacific Ocean and south of Africa that coincide with the locations of deep mantle plumes. We interpret these anomalies as sinking tectonic plates and convective instabilities between 1,000 and 2,500 km depth, consistent with seismic tomography results. Along the former Tethyan Margin, our data also identify an east-west-oriented mass anomaly likely in the upper mantle. We suggest that by combining gravity gradients with seismic and geodynamic data, an integrated dynamic model for Earth can be achieved. © 2014 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106445
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: Institut National de l'Information Géographique et Forestière, Laboratoire LAREG, Université Paris Diderot, 35 rue Hélène Brion, 75205 Paris Cedex 13, France; Université Paris Diderot, Sorbonne Paris-Cité, Institut de Physique du Globe de Paris, F-75013 Paris, France; Centre National d'Etudes Spatiales, 2, place Maurice Quentin, 75039 Paris, France
Recommended Citation:
Panet I.,Pajot-Métivier G.,Greff-Lefftz M.,et al. Mapping the mass distribution of Earth's mantle using satellite-derived gravity gradients[J]. Nature Geoscience,2014-01-01,7(2)