Refine
Has Fulltext
- no (6) (remove)
Document Type
- Article (6) (remove)
Language
- English (6)
Is part of the Bibliography
- yes (6)
Keywords
- plume (2)
- subduction zone (2)
- Numerical modelling (1)
- Subduction zone processes (1)
- mantle plume (1)
- multi-slab (1)
- numerical model (1)
- numerical modeling (1)
- numerical models (1)
- oceanic lithosphere (1)
Institute
Initiation of subduction following the impingement of a hot buoyant mantle plume is one of the few scenarios that allow breaking the lithosphere and recycling a stagnant lid without requiring any preexisting weak zones. Here, we investigate factors controlling the number and shape of retreating subducting slabs formed by plume-lithosphere interaction. Using 3-D thermomechanical models we show that the deformation regime, which defines formation of single-slab or multi-slab subduction, depends on several parameters such as age of oceanic lithosphere, thickness of the crust and large-scale lithospheric extension rate. Our model results indicate that on present-day Earth multi-slab plume-induced subduction is initiated only if the oceanic lithosphere is relatively young (<30-40 Myr, but >10 Myr), and the crust has a typical thickness of 8 km. In turn, development of single-slab subduction is facilitated by older lithosphere and pre-imposed extensional stresses. In early Earth, plume-lithosphere interaction could have led to formation of either episodic short-lived circular subduction when the oceanic lithosphere was young or to multi-slab subduction when the lithosphere was old.