期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
卷 119, 期 10, 页码 7889-7908出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014JB011078
关键词
tectonics; Arctic; dynamic topography; subduction
资金
- Australian Research Council (ARC) [FL0992245]
- ARC [LP0989312, DP0987713]
- Research Council of Norway through its Centers of Excellence [223272]
- Statoil ASA
- NSF [EAR1247022]
- Division Of Earth Sciences
- Directorate For Geosciences [1247022] Funding Source: National Science Foundation
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 similar to 30 degrees N and from a combination of ocean-continent and intraoceanic subduction north of 50 degrees N. We compute circum-Arctic dynamic topography through time from subduction-driven convection models and find that slabs have imparted on average <1-16m/Myr of dynamic subsidence across the region from at least 170Ma to similar to 50Ma. With the exception of Siberia, the main phase of circum-Arctic dynamic subsidence has been followed either by slowed subsidence or by uplift of <1-6m/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 21m/Myr, between 170 and 130Ma) and for dynamic subsidence (<7m/Myr, similar to 170-50Ma) followed by dynamic uplift (<6m/Myr since 50Ma) 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.
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