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Basaltic composition magma forms at different tectonic settings. Basaltic magma is always derived from a partial melt of the asthenosphere.

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  1. Basaltic composition magma forms at different tectonic settings. Basaltic magma is always derived from a partial melt of the asthenosphere.

  2. Basaltic composition magma (lava) has a relatively low viscosity and will flow great distances from its vent. It is dark colored because of its mafic content (largely pyroxene and Ca-rich plagioclase).

  3. Granitic composition magma is produced at continental collision margins. As the continental crust thickens it begins to partially melt at depth. Igneous intrusions (plutons) form below the mountain belts. Volcanism is rare in continental collision boundaries.

  4. Granitic composition magma reaches to the surface in Yellowstone Park because the continental crust is being heated by upwelling magma generated from a asthenospheric hotspot.

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