Plume-like upper mantle instabilities drive subduction initiation

被引：88

作者：

Burov, Evgueni ^{[1
]}

Cloetingh, Sierd ^{[2
]}

机构：

[1] Univ Paris 06, CNRS, UMR 7193, iSteP,Case 129, F-75252 Paris 05, France

[2] Vrije Univ Amsterdam, Fac Earth & Life Sci, Netherlands Ctr Integrated Solid Earth Sci, NE-1081 HV Amsterdam, Netherlands

来源：

GEOPHYSICAL RESEARCH LETTERS | 2010年 / 37卷

关键词：

CONTINENTAL LITHOSPHERE; COLLISION; EXTENSION; EVOLUTION; MARGINS;

D O I：

10.1029/2009GL041535

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The control of upper mantle-lithosphere interactions (MLI) on compressional tectonics is not well resolved. This applies to the role of MLI in triggering of subduction initiation or lithosphere mantle (LM) downwellings. We present results of thermo-mechanically thermo-dynamically coupled numerical experiments that are consistent with an array of recent geophysical constraints on lithosphere and upper mantle rheology and structure. We demonstrate that MLI can lead to initiation of continental lithosphere subduction, inducing its spontaneous downthrusting to depths of 300-500 km upon plume impingement of the lithosphere. This downthrusting is pre-conditioned by rheological stratification of visco-elasto-plastic lithosphere and its free surface. The subsequent evolution of the slab is governed by phase changes and its interactions with the surrounding mantle. We demonstrate that the mode of MLI is strongly affected by the lateral heterogeneities and the presence of suture zones in the lithosphere. Citation: Burov, E., and S. Cloetingh (2010), Plume-like upper mantle instabilities drive subduction initiation, Geophys. Res. Lett., 37, L03309, doi: 10.1029/2009GL041535.

引用

页数：6

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