Mapping the mass distribution of Earth’s mantle using satellite-derived gravity gradients

Panet, I.; Pajot-Métivier, Gwendoline; Greff-Lefftz, M.; Métivier, Laurent; Diament, M.; Mandea, Mioara

doi:10.1038/ngeo2063

Cited by 62 publications

(45 citation statements)

References 30 publications

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“…Although the geoid, free-air anomaly, and gravity gradients are all derived from the gravitational field, they are sensitive to mantle structures over different depth and length scales. It has also recently been suggested that the gravity gradients (for example, from the GOCE, Gravity field and steady-state Ocean Circulation Explorer, mission) provide additional constraints on mantle structure and dynamics (Panet et al, 2014). The zonal coefficients of the hydrostatic (Chambat et al, 2010) and coefficients of incomplete postglacial rebound (Geruo et al, 2013) have been subtracted from the GOCE (Reguzzoni and Tselfes, 2009) geopotential models to reveal a gravitational signal putatively related to mantle flow.…”

Section: Methodsmentioning

confidence: 99%

“…It has been suggested that gravity gradients provide extra constraints on mantle structure and dynamics (Panet et al, 2014). We conduct an additional synthetic inversion test, in which the gravity gradients are removed as constraints, to investigate the extra information provided by gravity gradients to the mantle viscosity inversion.…”

Section: Recovered Viscositymentioning

confidence: 99%

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Dynamic topography, gravity and the role of lateral viscosity variations from inversion of global mantle flow

Yang¹,

Gurnis²

2016

Geophys. J. Int.

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Section: Methodsmentioning

confidence: 99%

Section: Recovered Viscositymentioning

confidence: 99%

Dynamic topography, gravity and the role of lateral viscosity variations from inversion of global mantle flow

Yang¹,

Gurnis²

2016

Geophys. J. Int.

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“…Satellite‐derived measurements of the Earth's gravity field can be used to observe density variations within the planet (Barzaghi et al, ; Ebbing et al, ). Applications of these data for evaluation of the lithosphere have concentrated on the mantle (e.g., density and stress state and determination of the Mohorovic discontinuity; Bouman et al, ; Panet et al, ; Uieda & Barbosa, ; Van der Meijde et al, ), with much less emphasis on the crustal structures (Bouman et al, ; Braitenberg, ; Ebbing et al, ; Van der Meijde et al, ). Crustal studies have shown distinctive characteristics in the framework of the African and South American continents (Braitenberg, ) with data from the Gravity Field and Steady‐State Ocean Circulation mission.…”

Section: Introductionmentioning

confidence: 99%

Proxies for Basement Structure and Its Implications for Mesoproterozoic Metallogenic Provinces in the Gawler Craton

et al. 2019

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The link between mineral resources and crustal‐rooted structures has been proposed for many of the world's most significant mineral provinces. Here we utilize a new approach by interpreting potential field data, including satellite gravity data, and high‐resolution continental‐scale magnetotelluric data, constrained with aeromagnetic, and seismic tomography and reflection data, to determine the distribution of crustal‐scale faults in the Archean to Proterozoic Gawler Craton (South Australia). The eastern flank of the craton hosts the supergiant Olympic Dam iron oxide‐copper‐gold (IOCG) deposit within a larger Olympic IOCG province. The central part of the craton contains gold‐only deposits, which define the Central Gawler Gold province. Both of these provinces are part of a Mesoproterozoic mineral system with an extensive hydrothermal alteration footprint, which formed during complicated tectonic mode switches. We show that both types of mineralization are located in proximity to crustal‐scale structures that appear to connect deep crustal fragments, which likely record the amalgamation of the Archean nucleus of the craton during the Neoarchean with subsequent reworking during the Mesoproterozoic. Many of these structures do not have a surface expression but coincide with gradients in magnetism, gravity, and electric resistivity anomalies, the latter data set suggesting they acted as fluid pathways extending to the lower crust. The results indicate that the first‐order controls on the distribution of IOCG and Central Gawler Gold metallogenic provinces are inherited from earlier tectonic events, which formed major crustal boundaries and related structures that are prone to reworking during later tectonism.

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“…Figure a displays GOCE V NN ; the geophysical signal induced by the subduction processes (Panet et al, ) in the area follows a longitudinal direction and transitions from positive to negative, dominantly for 5 ο < ϕ < 20 ο N. GRACE V NN estimates (Figure b) depict similar pattern.…”

Section: Grace and Goce Ggt Comparisons: Qualitative Assessmentmentioning

confidence: 83%

Gravity Gradiometry With GRACE Space Missions: New Opportunities for the Geosciences

Peidou

Pagiatakis

2019

JGR Solid Earth

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A new paradigm views the recently launched Gravity Recovery and Climate Experiment (GRACE) follow‐on mission as a gradiometer system, outside the mission's design concept, promising potentially major implications in geosciences. We develop an innovative and straightforward concept, the “GRACE gradiometer mode,” to process future GRACE follow‐on measurements to derive three‐dimensional gravitational gradients. Using positions, accelerations, and attitude measurements from the identical predecessor mission GRACE, we generate common and differential accelerations. We validate GRACE differential accelerations using Gravity field and steady‐state Ocean Circulation Explorer (GOCE) mission gradiometer measurements and we demonstrate an important and promising agreement between GRACE and GOCE. Consequently, we estimate gravitational gradients in full and we confirm their ability to detect geophysical signals over three example regions, namely, the Himalayas, Indonesia, and Canada. Coherence analysis between GOCE and GRACE gradients reveals a strong match that reaches up to 80%. GRACE gradiometer mode gradients are also compared with GRACE level 2‐ derived gradients, and results show that the new method captures smaller spatial‐scale signals than GOCE with the trade‐off being at higher noise level. We argue that future enhancements of the proposed proof‐of‐concept method will expand and enhance the GRACE follow‐on objectives that will lead to new insights, discoveries, and applications in the Earth system and the geosciences.

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Mapping the mass distribution of Earth’s mantle using satellite-derived gravity gradients

Cited by 62 publications

References 30 publications

Dynamic topography, gravity and the role of lateral viscosity variations from inversion of global mantle flow

Dynamic topography, gravity and the role of lateral viscosity variations from inversion of global mantle flow

Proxies for Basement Structure and Its Implications for Mesoproterozoic Metallogenic Provinces in the Gawler Craton

Gravity Gradiometry With GRACE Space Missions: New Opportunities for the Geosciences

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