GLG 201 Lecture Notes - Lecture 2: Eclogite, Dacite, Gabbro
Igneous – Summary
Igneous rock-crystal deposits, the crystallization of which is an essential condition of
igneous rocks. The main elements in the mineral composition of magmas are sulphur,
oxygen, calcium, iron, magnesium, and silicon. The major magma bodies include:
basalt, gabbro, rhyolite, and dacite. The formation and evolution of these igneous rocks
can be seen through the ages in this and other geological books.
(Amino acids and the basic elements. They are the building blocks of organic
compounds. They exist in three states, aqueous, acidic and basic, and each is
represented by the letter A, B, or C. The most basic elements are calcium, hydrogen,
helium and neon. The next three are silicon, sulphur and oxygen. The alkali metals
include lead, zinc, and nickel. Oxygen atoms are usually represented by the letter O, the
most common elements in life.)
Igneous rock" or "magmatic" rocks are all forms of crystalline rocks. These include all
forms of the basaltic and eclogite groups, but also the granite and other volcanic rocks
of the world.
Magmatic rocks are classified as igneous if they contain significant amounts of molten
