Lithosphere Destabilization by Melt Weakening and Crust-Mantle Interactions : Implications for Generation of Granite-Migmatite Belts

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Kaislaniemi , L , van Hunen , J & Bouilhol , P 2018 , ' Lithosphere Destabilization by Melt Weakening and Crust-Mantle Interactions : Implications for Generation of Granite-Migmatite Belts ' , Tectonics , vol. 37 , no. 9 , pp. 3102-3116 . https://doi.org/10.1029/2018TC005014

Title: Lithosphere Destabilization by Melt Weakening and Crust-Mantle Interactions : Implications for Generation of Granite-Migmatite Belts
Author: Kaislaniemi, L.; van Hunen, J.; Bouilhol, Pierre
Contributor: University of Helsinki, Department of Geosciences and Geography
Date: 2018-09
Language: eng
Number of pages: 15
Belongs to series: Tectonics
ISSN: 0278-7407
URI: http://hdl.handle.net/10138/300149
Abstract: Orogenic crustal anatexis is a still poorly understood process due to the complexity of the thermal and geodynamical interaction between mantle and crustal processes during and after continental collision. Here we present a novel conceptual model for the formation of granite-migmatite belts: we propose that convective thinning of the lithosphere results in minor amounts of partial melts within the lowermost crust that trigger further instabilities. This will lead to positive feedback effects between melt weakening, mantle upwelling, and wholesale mantle lithosphere removal, causing a strong pulse of mantle and crustal melting. We test this model numerically, and results show that this process, taking between 20 and 50Myr in total, can explain the temporal evolution of melting in granite-migmatite zones and associated mantle-derived mafic rocks and provides a heat source for crustal melting without the need for other processes, such as slab break-off or increased radiogenic heating. Furthermore, the generation of a refractory residue after mantle and crustal melting is also shown to control the progress of the lithospheric mantle removal, providing another feedback mechanism between melting and lithospheric reequilibration.
Subject: CONTINENTAL COLLISION ZONES
BENEATH SOUTHERN TIBET
OROGENIC EVOLUTION
POSTCOLLISIONAL MAGMATISM
RHEOLOGICAL TRANSITIONS
MOUNTAIN BELTS
CENTRAL IBERIA
MASSIF
DELAMINATION
GENESIS
1171 Geosciences
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