Crustal thickness beneath the Queen Charlotte Basin, Canada: Results of a seismically constrained gravity inversion

1995 ◽  
Vol 100 (B12) ◽  
pp. 24331-24345 ◽  
Author(s):  
C. Lowe ◽  
S. A. Dehler
Keyword(s):  
Crustal Thickness ◽  
Gravity Inversion

ArcCRUST: Arctic Crustal Thickness From 3‐D Gravity Inversion

2019 ◽  
Vol 20 (7) ◽  
pp. 3225-3247 ◽  
Author(s):  
Nina Lebedeva‐Ivanova ◽  
Carmen Gaina ◽  
Alexander Minakov ◽  
Sergey Kashubin
Keyword(s):  
Crustal Thickness ◽  
Gravity Inversion

Aegean crustal thickness inferred from gravity inversion. Geodynamical implications

2004 ◽  
Vol 228 (3-4) ◽  
pp. 267-280 ◽  
Author(s):  
Céline Tirel ◽  
Frédéric Gueydan ◽  
Christel Tiberi ◽  
Jean-Pierre Brun
Keyword(s):  
Crustal Thickness ◽  
Gravity Inversion

scholarly journals Moho Geometry of the Okinawa Trough Based on Gravity Inversion and Its Implications on the Crustal Nature and Tectonic Evolution

2021 ◽  
Vol 9 ◽  
Author(s):  
Liang Zhang ◽  
Xiwu Luan
Keyword(s):  
Early Stage ◽  
Okinawa Trough ◽  
High Heat ◽  
Crustal Thickness ◽  
Moho Depth ◽  
Gravity Inversion ◽  
The Okinawa Trough ◽  
Oceanic Spreading ◽  
Thickness Variations ◽  
Back Arc

The Okinawa Trough (OT) is an incipient back-arc basin, but its crustal nature is still controversial. Gravity inversion along with sediment and lithospheric mantle density modeling are used to map the regional Moho depth and crustal thickness variations of the OT and its adjacent areas. The gravity inversion result shows that the crustal thicknesses are 17–22 km at the northern OT, 11–19 km at the central OT, and 7–19 km at the southern OT. Because of the crust with a thickness larger than 17 km, the slow southward arc movement, and scarce contemporaneous volcanisms, the northern OT should be in the stage of early back-arc extension. All of the moderate crustal thickness, high heat flow, and intense volcanism at the central OT indicate that this region is probably in the transitional stage from the back-arc rifting to the oceanic spreading. A crust that is only 7 km thick, lithosphere strength as low as the mid-ocean ridge, and MORB-similar basalts at the southern OT demonstrate that the southern OT is at the early stage of seafloor spreading.

scholarly journals Inverse and forward gravity modeling for revealing the crustal structure of Volga-Uralian subcraton

2021 ◽  
Author(s):  
Igor Ognev ◽  
Jörg Ebbing ◽  
Peter Haas
Keyword(s):  
Lower Crust ◽  
Sedimentary Cover ◽  
Central Area ◽  
Crustal Thickness ◽  
Gravity Modeling ◽  
Gravity Inversion ◽  
Thickness Variation ◽  
Rift System ◽  
Ural Mountains ◽  
Crustal Model

<p>A new crustal model of the Volga-Uralian subcraton was built. The compilation of the model was subdivided in two steps: (1) inverse gravity modeling followed by (2) thorough forward gravity modeling.</p><p>For inverse gravity modeling GOCE gravity gradients were used. The effect of the Earth sphericity was taken into account by using tesseroids. Density contrasts between crust and mantle were varied laterally according to the tectonic units present in the region.  The model is constrained by the available seismic data including receiver function studies, and deep reflection and refraction profiles.</p><p>The Moho discontinuity obtained during the gravity inversion was consequently modified, and complemented by the sedimentary cover, upper crust, lower crust, and lithospheric mantle layers in the process of forward gravity modeling. Obtained model showed crustal thickness variation from 34 to more than 55 km in some areas. The thinnest crust with the thickness below 40 km appeared on the Pericaspian basin with the thickest sedimentary column. A relatively thin crust was found along the central Russia rift system, while the thickest crust is located underneath Ural Mountains as well as in the center of the Volga-Uralian subcraton. In both areas the crustal thickness exceeds 50 km. At the same time, the gravity misfit of ca. 95 mGal between the measured Bouguer gravity anomaly and forward calculated gravity field was revealed in the central area of the Volga-Uralian subcraton. This misfit was interpreted and modeled as high-density lower crust which can possibly represent an underplated material.</p><p>In the end, the new crustal model of Volga-Uralian subcraton respects the gravity and seismic constraints, and reflects the main geological features of the region. This model will be used for further geothermal analysis of the area.</p>

scholarly journals South China Sea crustal thickness and oceanic lithosphere distribution from satellite gravity inversion

2018 ◽  
Vol 25 (1) ◽  
pp. 112-128 ◽  
Author(s):  
Simon Gozzard ◽  
Nick Kusznir ◽  
Dieter Franke ◽  
Andrew Cullen ◽  
Paul Reemst ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Oceanic Lithosphere ◽  
Crustal Thickness ◽  
Gravity Inversion ◽  
Satellite Gravity ◽  
China Sea

Investigating the role of Iberia and its interplay with the Newfoundland and Irish offshore margins using plate reconstructions

2020 ◽  
Author(s):  
Michael King ◽  
Kim Welford ◽  
Alexander Peace
Keyword(s):  
North Atlantic ◽  
Oil And Gas ◽  
Crustal Thickness ◽  
Temporal Variations ◽  
Gravity Inversion ◽  
Plate Tectonic ◽  
The West ◽  
Iberian Margin ◽  
Independent Motion

<p>The tectonic evolution of the southern North Atlantic is a subject of increasing interest due to its continental margins playing host to several world-class frontier regions for oil and gas exploration. The Newfoundland-Iberia conjugate margin pair serves as one of the best studied non-volcanic rifted conjugate margin pairs in the world, and is a topic of constant scientific debate due to its complex plate kinematic history and geological evolution.  Recent adaptability of the GPlates freely available plate tectonic reconstruction software provides an excellent tool for gaining insight into complex plate kinematic problems. The ability to account for regions of deformation, integration of various geological and geophysical datasets, and the ability to calculate temporal variations in crustal thickness, strain rates, and velocity vectors provide an optimal environment for solving crustal-scale geological and geophysical problems. Building upon previous rigid and deformable plate tectonic modelling studies, the aim of this work is to create deformable plate tectonic models of Iberia with emphasis on the West Iberian margin and the Pyrenees to assess Iberia’s evolution during the formation of the southern North Atlantic from 200 Ma to present day. A comparison of crustal thickness results calculated from GPlates models with those obtained from gravity inversion, passive and controlled source seismology, and geological field mapping, provided a good metric for investigating the plate kinematics of Iberia and assessing previous discrepancies when considering the crustal evolution of the West Iberian margin and the Pyrenees as an integrated plate kinematic system. Results from the GPlates models produced in this study also demonstrate the significance of continental fragments and their independent motion during rifting. In particular, we investigate the independent motion of the Galicia Bank and its role with respect to the deformation experienced within the Galicia Interior Basin and the role of the Ebro Block and Landes High during deformation prior to the Pyrenean Orogeny. In addition, this study highlights the importance of inherited structures with respect to the styles of deformation experienced during rifting of continental crust. Preliminary deformable plate modeling results of the West Iberian margin indicate that the independent motion of the Galicia Bank and its interplay with inherited structures is crucial for deriving the amount of deformation inferred by gravity inversion and regional seismic studies within the Galicia Interior Basin.</p>

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