Zoeken
Zoeken kan via de modus 'eenvoudig zoeken' (één veld) of uitgebreid via 'geavanceerd zoeken' (meerdere velden). Zo kan je bv. zoeken op een combinatie van een auteursnaam (auteur), een jaartal (jaar) en een documenttype.
Boekenmand
Nuttige resultaten kan je aanvinken en toevoegen aan een mandje. De inhoud hiervan kan je exporteren of afdrukken (naar bv. PDF).
RSS
Op de hoogte blijven van nieuw toegevoegde publicaties binnen uw interessegebied? Dit kan door een RSS-feed (?) te maken van jouw zoekopdracht.
nieuwe zoekopdracht
Extensional tectonics and two-stage crustal accretion at oceanic transform faults
Grevemeyer, I.; Rüpke, L.H.; Morgan, J.P.; Iyer, K.; Devey, C.W. (2021). Extensional tectonics and two-stage crustal accretion at oceanic transform faults. Nature (Lond.) 591(7850): 402-407. https://dx.doi.org/10.1038/s41586-021-03278-9
In: Nature: International Weekly Journal of Science. Nature Publishing Group: London. ISSN 0028-0836; e-ISSN 1476-4687, meer
|  |
| Auteurs | | Top |
- Grevemeyer, I.
- Rüpke, L.H.
- Morgan, J.P.
|
|
|
| Abstract |
Oceanic transform faults are seismically and tectonically active plate boundaries that leave scars—known as fracture zones—on oceanic plates that can cross entire ocean basins. Current descriptions of plate tectonics assume transform faults to be conservative two-dimensional strike–slip boundaries at which lithosphere is neither created nor destroyed and along which the lithosphere cools and deepens as a function of the age of the plate. However, a recent compilation of high-resolution multibeam bathymetric data from 41 oceanic transform faults and their associated fracture zones that covers all possible spreading rates shows that this assumption is incorrect. Here we show that the seafloor along transform faults is systemically deeper (by up to 1.6 kilometres) than their associated fracture zones, in contrast to expectations based on plate-cooling arguments. Accretion at intersections between oceanic ridges and transform faults seems to be strongly asymmetric: the outside corners of the intersections show shallower relief and more extensive magmatism, whereas the inside corners have deep nodal basins and seem to be magmatically starved. Three-dimensional viscoplastic numerical models show that plastic-shear failure within the deformation zone around the transform fault results in the plate boundary experiencing increasingly oblique shear at increasing depths below the seafloor. This results in extension around the inside corner, which thins the crust and lithosphere at the transform fault and is linked to deepening of the seafloor along the transform fault. Bathymetric data suggest that the thinned transform-fault crust is augmented by a second stage of magmatism as the transform fault intersects the opposing ridge axis. This makes accretion at transform-fault systems a two-stage process, fundamentally different from accretion elsewhere along mid-ocean ridges. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
