TY  - JOUR
A1  - Baes, Marzieh
A1  - Sobolev, Stephan
A1  - Gerya, Taras
A1  - Brune, Sascha
T1  - Plume-Induced Subduction Initiation: Single-Slab or Multi-Slab Subduction?
Y1  - 2020
VL  - 21
IS  - 2
JF  - Geochemistry, Geophysics, Geosystems
DO  - 10.1029/2019GC008663
DO  - 10.23689/fidgeo-4996
N2  - 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.
UR  - http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9342
ER  -