Details
| Original language | English |
|---|---|
| Pages (from-to) | 1515-1522 |
| Number of pages | 8 |
| Journal | Geophysical journal international |
| Volume | 215 |
| Issue number | 3 |
| Publication status | Published - 13 Aug 2018 |
| Externally published | Yes |
Abstract
Pre-existing weakness zones in the lithosphere such as transform faults/fracture zones and extinct mid-oceanic ridges have been suggested to facilitate subduction initiation in an intraoceanic environment. Here, we propose that the additional forcing coming from the mantle suction flow is required to trigger the conversion of a fracture zone/transform fault into a converging plate boundary. This suction flow can be induced either from the slab remnants of former converging plate boundaries or/and from slabs of neighbouring active subduction zones. Using 2-D coupled thermo-mechanical models, we show that a sufficiently strong mantle flow is able to convert a fracture zone/transform fault into a subduction zone. However, this process is feasible only if the fracture zone/transform fault is very close to the midoceanic ridge. Our numerical model results indicate that time of subduction initiation depends on the velocity, domain size and location of mantle suction flow and age of the oceanic plate.
Keywords
- Numerical modelling;, Oceanic transform and fracture zone processes, Subduction zone processes
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geophysics
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
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In: Geophysical journal international, Vol. 215, No. 3, 13.08.2018, p. 1515-1522.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Subduction initiation in mid-ocean induced by mantle suction flow
AU - Baes, M.
AU - Sobolev, S.V.
AU - Quinteros, J.
N1 - Publisher Copyright: © The Author(s) 2018. Published by Oxford University Press on behalf of The Royal Astronomical Society.
PY - 2018/8/13
Y1 - 2018/8/13
N2 - Pre-existing weakness zones in the lithosphere such as transform faults/fracture zones and extinct mid-oceanic ridges have been suggested to facilitate subduction initiation in an intraoceanic environment. Here, we propose that the additional forcing coming from the mantle suction flow is required to trigger the conversion of a fracture zone/transform fault into a converging plate boundary. This suction flow can be induced either from the slab remnants of former converging plate boundaries or/and from slabs of neighbouring active subduction zones. Using 2-D coupled thermo-mechanical models, we show that a sufficiently strong mantle flow is able to convert a fracture zone/transform fault into a subduction zone. However, this process is feasible only if the fracture zone/transform fault is very close to the midoceanic ridge. Our numerical model results indicate that time of subduction initiation depends on the velocity, domain size and location of mantle suction flow and age of the oceanic plate.
AB - Pre-existing weakness zones in the lithosphere such as transform faults/fracture zones and extinct mid-oceanic ridges have been suggested to facilitate subduction initiation in an intraoceanic environment. Here, we propose that the additional forcing coming from the mantle suction flow is required to trigger the conversion of a fracture zone/transform fault into a converging plate boundary. This suction flow can be induced either from the slab remnants of former converging plate boundaries or/and from slabs of neighbouring active subduction zones. Using 2-D coupled thermo-mechanical models, we show that a sufficiently strong mantle flow is able to convert a fracture zone/transform fault into a subduction zone. However, this process is feasible only if the fracture zone/transform fault is very close to the midoceanic ridge. Our numerical model results indicate that time of subduction initiation depends on the velocity, domain size and location of mantle suction flow and age of the oceanic plate.
KW - Numerical modelling;
KW - Oceanic transform and fracture zone processes
KW - Subduction zone processes
UR - http://www.scopus.com/inward/record.url?scp=85054721683&partnerID=8YFLogxK
U2 - 10.1093/gji/ggy335
DO - 10.1093/gji/ggy335
M3 - Article
VL - 215
SP - 1515
EP - 1522
JO - Geophysical journal international
JF - Geophysical journal international
SN - 0956-540X
IS - 3
ER -