Comment les pierres racontent la Terre (2011 - Pierre THOMAS ...
Comment les pierres racontent la Terre (2011 - Pierre THOMAS ...
Comment les pierres racontent la Terre (2011 - Pierre THOMAS ...
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Basalte Rhyolite<br />
SiO2 = 35% SiO2 = 50% SiO2 = 60%<br />
SiO2 = 45% SiO2 = 55% SiO2 = 65% SiO2 = 70%<br />
1200°C 950°C 700°C<br />
La cristallisation fractionnée (= différenciation)<br />
modifie <strong>la</strong> chimie, donc <strong>la</strong> viscosité du magma