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زمینشناسی و معدن::
پوسته قاره ای، پوسته قاره ای
When continental crust is strongly thinned by the rifting process, hot asthenosphere rapidly ascends.
The rhyolites are differentiates of the basaltic magmas and not developed from the melting of continental crust as it is frequently observed at continental hot spots.
The negative gravity anomaly of Iceland is thus not related to lighter continental crust but to the anomalously hot and molten, and thus relatively light, uppermost mantle, the head of the plume and the MORB source.
This acidic vol- canism arises because the upwelling magmas pass through thick continental crust.
Moreover, magmatism initiated by subduction is responsible for the creation of continental crust through a se- ries of complex processes.
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