Most hotspot volcanoes are basaltic ( e . g ., continental regions, basaltic magma rises through the continental crust, which melts to form rhyolites.
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As the Pacific plate is being pushed to the west / northwest, it is traveling over a hot spot that is erupting silica poor basaltic magma.
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Instead, the basaltic magma forms a large magma chamber at the base of the crust and ultramafic cumulates which stay at the base of the crust.
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However, when the rhyolite is completely erupted, it may be followed by eruptions of basaltic magma rising through the same lithospheric fissures ( cracks in the lithosphere ).
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Overall the environment where the rocks formed appears to be an oxidized system that formed over 100, 000-200, 000 years, and was influenced by the injection of basaltic magma.
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The volcanoes forming the two major Menan Buttes were created when basaltic magma came into contact with a shallow aquifer or with the precursor of the modern Snake River.
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Unlike the Pacific Ocean's " black smoker " vents, with their extreme high heat and volcanic eruptions of basaltic magma, these bony white Atlantic Ocean vents ran cooler and involved no apparent volcanism.
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Hallival and Askival are formed from an extraordinary series of dykes of basalt on the northwest coast between Kilmory and Guirdil, created by basaltic magma forcing its way into fissures in the pre-existing rock.
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Eventually, this swelling turned into an active volcano, erupting basaltic magma . 600 million years ago, the volcano walls became so large and heavy, they caved in on the volcano, acting as a plug.
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In magmas which do not have a restite component, such as most M-type granites, some A-type granites, and most basaltic magmas, it is much easier for these magmas to achieve more dramatic fractional crystallization effects.
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