Citation:

2018GC008098

Name: ArcCRUST: Arctic crustal thickness from 3D gravity inversion, links to files in NetCDF format
Published: 2019-04-01
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Arctic; crutsal thickness; Moho; oceanic lithosphere; sediment thickness

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Published: 2019-04-01 • DOI registered: 2019-04-02

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Abstract:

The ArcCRUST model consists of crustal thickness and estimated crustal thinning factors grids for the High Arctic and Circum-Arctic regions (north of 67°N). This model is derived by using 3D forward and inverse gravity modelling. Updated sedimentary thickness grid, an oceanic lithosphere age model together with inferred microcontinent rifting ages, variable crystalline crust and sediment densities, and dynamic topography models constrain this inversion. We use published high-quality 2D seismic crustal-scale models to create a database of Depths to Seismic Moho (DSM) profiles. To check the quality of the ArcCRUST model, we have performed a statistical analysis of misfits between the ArcCRUST Moho depths and DSM values. Systematic analysis of the misfits within the Arctic sedimentary basins provides information about tectonic processes unaccounted by the assumed model of pure-shear lithospheric extension. In particular, our model implies a less-dense and/or thin mantle lithosphere underneath microcontinents in the deep Arctic Ocean where the ArcCRUST depth to Moho values exceed the depth to seismic Moho. A systematically larger gravity-derived crustal thickness (ca. 3 km) under the western and northern Greenland Sea points to a hotter upper mantle implied by the seismic tomography models in the North Atlantic.

Keyword(s):

Arctic; crutsal thickness; Moho; oceanic lithosphere; sediment thickness

Further details:

Petrov, Oleg; Morozov, Andrey A; Shokalsky, Sergey; Kashubin, Sergei; Artemieva, Irina M; Sobolev, Nikolai; Petrov, Evgeny; Ernst, Richard E; Sergeev, Sergey; Smelror, Morten (2016): Crustal structure and tectonic model of the Arctic region. Earth-Science Reviews, 154, 29-71, https://doi.org/10.1016/j.earscirev.2015.11.013

Coverage:

Median Latitude: 78.162500 * Median Longitude: 180.000000 * South-bound Latitude: 67.000000 * West-bound Longitude: 179.050000 * North-bound Latitude: 90.000000 * East-bound Longitude: -179.050000

Event(s):

ArcCRUST-AgeOceanicLithosphere * Latitude Start: 67.050000 * Longitude Start: -179.050000 * Latitude End: 89.050000 * Longitude End: 179.050000

ArcCRUST-CrustalThickness * Latitude Start: 67.050000 * Longitude Start: -179.050000 * Latitude End: 89.050000 * Longitude End: 179.050000

ArcCRUST-Moho * Latitude Start: 67.000000 * Longitude Start: -180.000000 * Latitude End: 90.000000 * Longitude End: 180.000000

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Event label	Event		Gaina, Carmen
2	File content	Content		Gaina, Carmen	Content description
3	File content	Content		Gaina, Carmen	Grid format / Grid cell spacing
4	File name	File name		Gaina, Carmen
5	File format	File format		Gaina, Carmen
6	File size	File size	kByte	Gaina, Carmen
7	Uniform resource locator/link to file	URL file		Gaina, Carmen

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Size:

24 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Event	2 Content (Content description)	3 Content (Grid format / Grid cell spacing)	4 File name	5 File format	6 File size [kByte]	7 URL file
ArcCRUST-AgeOceanicLithosphere	Age of oceanic lithosphere in the circum-Arctic region	GMT netCDF format / 0.1 degree, Gridline node registration	ArcCRUST-AgeOceanicLithosphere-to67	NC	6499.910	ArcCRUST-AgeOceanicLithosphere-to67.nc
ArcCRUST-CrustalThickness	Crustal thickness of circum-Arctic region derived from 3D gravity inversion	GMT netCDF format / 0.1 degree, Gridline node registration	ArcCRUST-CrustalThickness-to67	NC	6499.910	ArcCRUST-CrustalThickness-to67.nc
ArcCRUST-Moho	Depth to Moho for circum-Arctic region derived from 3D gravity inversion	GMT netCDF format / 0.1 degree, Pixel node registration	ArcCRUST-Moho-to67	NC	3264.941	ArcCRUST-Moho-to67.nc
ArcCRUST-SedimentThickness	Sediment thickness of circum-Arctic region modified after Petrov et al., (2016)	GMT netCDF format / 0.1 degree, Gridline node registration	ArcCRUST-SedimentThickness-to67	NC	6499.922	ArcCRUST-SedimentThickness-to67.nc