If, as a mafic (basaltic) magma crystallizes (Figs. 3.3 and 3.4) underground, the crystals are removed from contact with the magma, and the remaining magma crystallizes separately, which kind of a rock will form first and which will form last?
Answer to relevant QuestionsIf a magma crystallizes at a temperature of about 1500°C, what is its likely composition— felsic or mafic? (See Fig. 3.3.)Why do many of the late-forming pegmatites of the previous question contain rare elements such as lithium, tin, and beryllium?Igneous rocks are classified on the basis of texture (grain size) and composition (mineralogy). A general indicator of igneous rock composition is the color. Name the following igneous rocks by referring to Fig. 3.4:How would one distinguish between an amygdaloidal basalt and a porphyritic basalt?Figure 3.16 includes three sketches of the Hawaiian Islands. (a) What is the origin of the islands? They are volcanoes
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