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زمینشناسی و معدن::
ریولیت، ریولیت
Seismic investigations demonstrate that the Icelandic crust is basaltic although acidic volcanic rocks (rhyolites) also occur.
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.
Approximately 8 % of rhyolitic melts may form from a basaltic magma by differentiation during cooling (Schmincke, 2004).
The earliest record of volcanism occurs in the Columbia River Plateau and comprises chiefly basalts but important rhyolites as well (Figs. 6.18, 6.19).
Compared to basalts, rhyolitic magmas are highly explosive and produce violent eruptions.،Seismic investigations demonstrate that the Icelandic crust is basaltic although acidic volcanic rocks (rhyolites) also occur.
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.
Approximately 8 % of rhyolitic melts may form from a basaltic magma by differentiation during cooling (Schmincke, 2004).
The earliest record of volcanism occurs in the Columbia River Plateau and comprises chiefly basalts but important rhyolites as well (Figs. 6.18, 6.19).
Compared to basalts, rhyolitic magmas are highly explosive and produce violent eruptions.
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