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• W4220797844 abstract "&lt;p&gt;Today, the European lithosphere is warm in average as attested by tomographic studies and many small volcanic centers located all over europe. This is of a prime interest for deep geothermal exploration to better understand the deep root of this effectively warm geothermal gradient in order to set better boundary conditions on fluid circulation models.&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;&lt;p&gt;Volcanism is still &amp;#8220;active&amp;#8221; in the French massif central and Geophysical data show that the lithosphere is warm but they do not pinpoint, in Today&amp;#8217;s mantle the signature of true mantle plume. Geological data show that the lithosphere might have been warm at least since Oligocene with the formation of the West European Rift system and the opening of the Gulf of Lion.&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;&lt;p&gt;We have first set up thermo-mechanical models to test whether the interactions of global mantle flow with the base of the lithosphere and in particular the mantle root of the Pyren&amp;#233;es could generate viscous flow instabilities sufficient to locally erode the lithosphere of the French Massif Central and permit partial melting of the mantle. This first set of simulations have shown that this hypothesis is only consistent with 1/ an initially wet or thin European mantle lithosphere, with &amp;#160;2/ a relatively slow motion of the asthenosphere relative to the lithosphere (1 to 2cm/yr at most) which is more compatible with large scale mantle flow rather than slab retreat rates and 3/ a small component far field extension. The biggest constrain on our model is that we need the mantle upwelling to erode the base of the lithosphere and rise to approximately 70 km depth to produce melt.&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;&lt;p&gt;This means that for the mantle to be hot Today, it must have been hot earlier than Oligocene.&amp;#160; This is not incompatible with the low temperature thermo-chronometers which suggest that the whole European platform was deeply eroded in presence of abnormally hot geothermal gradient while they show no global signature of the Oligocene event. We could keep it there but now we face a simple yet unanswered question. Simple thermal conductive model implies that in absence of tectonic events, like in the massif central or in Paris Basin, the thermal relaxation of the lithosphere should occur after 50 to 100Myr. Why is the western European lithosphere still warm today if the last global thermal event is co-eval with the opening of the Gulf of Biscay? &amp;#160;In other words, for modelers, what are the conditions to have a stable/steady state 100km thick lithosphere? &amp;#160;To answer that question, we added a deep mantle component to basal heat flow in the models.&lt;/p&gt;" @default.
• W4220797844 created "2022-04-03" @default.
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• W4220797844 date "2022-03-28" @default.
• W4220797844 modified "2023-10-18" @default.
• W4220797844 title "Mantle contribution to surface heat flow of stable europe" @default.
• W4220797844 doi "https://doi.org/10.5194/egusphere-egu22-11947" @default.
• W4220797844 hasPublicationYear "2022" @default.
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