GLY 101 1st Edition Lecture 6Outline of Last Lecture I. Magma: Parent Material of Igneous RockOutline of Current Lecture II. Igneous ProcessesIII. Igneous compositionsCurrent LectureII. Igneous Processes-igneous rocks form in two basic settings: molten rock can crystallize at depth or it can solidify at Earth’s surface-when magma crystallizes at depth it forms intrusive rocks-igneous rocks that form when molten rock solidifies at the surface are extrusive igneous rocks-extrusive rocks form when lava solidifies or when volcanic debris falls to Earth’s surfaceIII. Igneous compositions-igneous rocks are composed of silicate minerals-silicon and oxygen are the most abundant constituents of igneous rocks-aluminum, calcium, sodium, potassium, magnesium, and iron are also added in with silicon and oxygen-All of these elements are found in magma, when magma cools these elements come together to form dark silicates and light silicates-These igneous rocks can be divided into two groups, felsic and maficThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.-felsic is also known as granitic composition, these rocks have an abundance of light silicate minerals-mafic is also known as basaltic composition, these rocks have at least 45%of dark silicate minerals-rocks that are between granitic and basaltic are known as andesitic or intermediate
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