期刊
SCIENCE
卷 329, 期 5995, 页码 1033-1038出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1191223
关键词
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资金
- NSF [OCI-0749334, OCI-0748898, CCF-0427985, DMS-072474]
- NSF Earth Sciences [EAR-0426271, EAR-0810303]
- U.S. Department of Energy Office of Science [DE-FC02-06ER25782, DE-SC0002710]
- Gordon and Betty Moore Foundation
- Computing resources on Texas Advanced Computing Center through the NSF [TG-MCA04N026]
- Directorate For Geosciences
- Division Of Earth Sciences [0810303] Funding Source: National Science Foundation
- Directorate For Geosciences
- Office of Polar Programs (OPP) [0941678] Funding Source: National Science Foundation
Plate tectonics is regulated by driving and resisting forces concentrated at plate boundaries, but observationally constrained high-resolution models of global mantle flow remain a computational challenge. We capitalized on advances in adaptive mesh refinement algorithms on parallel computers to simulate global mantle flow by incorporating plate motions, with individual plate margins resolved down to a scale of 1 kilometer. Back-arc extension and slab rollback are emergent consequences of slab descent in the upper mantle. Cold thermal anomalies within the lower mantle couple into oceanic plates through narrow high-viscosity slabs, altering the velocity of oceanic plates. Viscous dissipation within the bending lithosphere at trenches amounts to similar to 5 to 20% of the total dissipation through the entire lithosphere and mantle.
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