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زمینشناسی و معدن::
تولوئیت
Tholeiitic magmatic rocks can occur in minor amounts near the magmatic front and certain alkaline rocks can be important in the backarc basin area.
Recall that most tholeiites are produced at mid-ocean ridges and above large hot spots whereas alkaline rocks occur dominantly in intra-plate domains, especially hot spots and continental graben structures.
Island arc tholeiites and boninites (andesites rich in Mg, named
Zonation of magmas in space and time Although magmatic belts above subduction zones are dominated by calc-alkaline rocks, tholeiitic and alkaline magmas also occur.
At the frontal part of the volcanic belt, tholeiitic magmas occur and are generally expressed as basaltic rocks.
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