CaltechAUTHORS
  A Caltech Library Service

Circum-Arctic mantle structure and long-wavelength topography since the Jurassic

Shephard, G. E. and Flament, N. and Williams, S. and Seton, M. and Gurnis, M. and Müeller, R. D. (2014) Circum-Arctic mantle structure and long-wavelength topography since the Jurassic. Journal of Geophysical Research. Solid Earth, 119 (10). pp. 7889-7908. ISSN 2169-9313. http://resolver.caltech.edu/CaltechAUTHORS:20150109-083415525

[img] PDF - Published Version
See Usage Policy.

15Mb
[img] Plain Text (Readme) - Supplemental Material
See Usage Policy.

11Kb
[img] MS Word (Text S1 and Tables S1–S3) - Supplemental Material
See Usage Policy.

145Kb
[img] PDF (Figure S1) - Supplemental Material
See Usage Policy.

1788Kb
[img] PDF (Figure S2) - Supplemental Material
See Usage Policy.

1309Kb
[img] PDF (Figure S3) - Supplemental Material
See Usage Policy.

2057Kb
[img] PDF (Figure S4) - Supplemental Material
See Usage Policy.

2011Kb
[img] PDF (Figure S5) - Supplemental Material
See Usage Policy.

1394Kb
[img] PDF (Figure S6) - Supplemental Material
See Usage Policy.

2707Kb
[img] PDF (Figure S7) - Supplemental Material
See Usage Policy.

2519Kb
[img] PDF (Figure S8) - Supplemental Material
See Usage Policy.

2556Kb
[img] PDF (Figure S9) - Supplemental Material
See Usage Policy.

1604Kb
[img] PDF (Figure S10) - Supplemental Material
See Usage Policy.

3171Kb
[img] PDF (Figure S11) - Supplemental Material
See Usage Policy.

1755Kb
[img] PDF (Figure S12) - Supplemental Material
See Usage Policy.

471Kb
[img] PDF (Figure S13) - Supplemental Material
See Usage Policy.

237Kb
[img] PDF (Figure S14) - Supplemental Material
See Usage Policy.

1850Kb
[img] PDF (Figure S15) - Supplemental Material
See Usage Policy.

1783Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20150109-083415525

Abstract

The circum-Arctic is one of the most tectonically complex regions of the world, shaped by a history of ocean basin opening and closure since the Early Jurassic. The region is characterized by contemporaneous large-scale Cenozoic exhumation extending from Alaska to the Atlantic, but its driving force is unknown. We show that the mantle flow associated with subducted slabs of the South Anuyi, Mongol-Okhotsk, and Panthalassa oceans have imparted long-wavelength deflection on overriding plates. We identify the Jurassic-Cretaceous South Anuyi slab under present-day Greenland in seismic tomography and numerical mantle flow models. Under North America, we propose the “Farallon” slab results from Andean-style ocean-continent convergence around ~30°N and from a combination of ocean-continent and intraoceanic subduction north of 50°N. We compute circum-Arctic dynamic topography through time from subduction-driven convection models and find that slabs have imparted on average <1–16 m/Myr of dynamic subsidence across the region from at least 170 Ma to ~50 Ma. With the exception of Siberia, the main phase of circum-Arctic dynamic subsidence has been followed either by slowed subsidence or by uplift of <1–6 m/Myr on average to present day. Comparing these results to geological inferences suggest that subduction-driven dynamic topography can account for rapid Middle to Late Jurassic subsidence in the Slave Craton and North Slope (respectively, <15 and 21 m/Myr, between 170 and 130 Ma) and for dynamic subsidence (<7 m/Myr, ~170–50 Ma) followed by dynamic uplift (<6 m/Myr since 50 Ma) of the Barents Sea region. Combining detailed kinematic reconstructions with geodynamic modeling and key geological observations constitutes a powerful tool to investigate the origin of vertical motion in remote regions.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1002/2014JB011078DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/2014JB011078/abstractPublisherArticle
http://onlinelibrary.wiley.com/doi/10.1002/2014JB011078/suppinfoRelated ItemSupporting Information
Additional Information:© 2014 American Geophysical Union. Received 3 Mar 2014. Accepted 7 Sep 2014. Accepted article online 11 Sep 2014. Published online 6 Oct 2014. G.E.S., S.W., M.S., and R.D.M. were supported by Australian Research Council (ARC) grant FL0992245, ARC Linkage grant LP0989312, and ARC Discovery grant DP0987713. G.E.S. was also partly supported by the Research Council of Norway through its Centers of Excellence funding scheme, project 223272. N.F. was supported by Statoil ASA, and M.G. was supported by NSF grant EAR1247022. We would like to thank Bernard Steinberger and an anonymous reviewer for their constructive comments. The associated data for the plate reconstruction of Shephard et al. [2013] can be downloaded at ftp://ftp.earthbyte.org/papers/Shephard_etal_Arctic_plate_model and for the Seton et al. [2012] model at ftp://ftp.earthbyte.org/papers/Seton_etal_Global_ESR/Seton_etal_Data. zip The global mantle flow models are proprietary; however, selected time dependent raster images of both the mantle structure and dynamic topography for loading into the plate reconstruction software GPlates (www.gplates.org) can be downloaded from ftp://ftp.earthbyte.org/papers/ Shephard_etal_Arctic_Mantle/ Shephard_etal_2014.zip.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
Australian Research Council (ARC)FL0992245
Australian Research Council (ARC)LP0989312
Australian Research Council (ARC)DP0987713
Research Council of Norway Centers of Excellence 223272
Statoil ASAUNSPECIFIED
NSFEAR1247022
Subject Keywords:tectonics; Arctic; dynamic topography; subduction
Record Number:CaltechAUTHORS:20150109-083415525
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150109-083415525
Official Citation:Shephard, G. E., N. Flament, S. Williams, M. Seton, M. Gurnis, and R. D. Müller (2014), Circum-Arctic mantle structure and long-wavelength topography since the Jurassic, J. Geophys. Res. Solid Earth, 119, 7889–7908, doi:10.1002/2014JB011078.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53454
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:09 Jan 2015 17:19
Last Modified:11 Jun 2015 12:44

Repository Staff Only: item control page