Intrusive(Coarse-grained) Igneous Rocks(4) Dark-colored diorite grades into gabbro. In gabbro, dark-colored minerals pyroxene and olivine exceed 50 percent of the volume of the rock A coarse-grained igneous rock in which olivine is the most abundant mineral is called a peridotite. Gabbros and peridodites can be found in both the oceanic and the continental crust
Intrusive (Coarse-grained) Igneous Rocks (4) ◼ Dark-colored diorite grades into gabbro. —In gabbro, dark-colored minerals pyroxene and olivine exceed 50 percent of the volume of the rock. ◼ A coarse-grained igneous rock in which olivine is the most abundant mineral is called a peridotite. ◼ Gabbros and peridodites can be found in both the oceanic and the continental crust
Extrusive(Fine-Grained) gneous Rocks (1) a Rhyolites and dacites are quartz-bearing Rhyolites contain a predominance of potassium feldspar. a Dacites contain a predominance of plagioclase. Dacites can only be distinguished from rhyolites through microscopic examination
Extrusive (Fine-Grained) Igneous Rocks (1) ◼ Rhyolites and dacites are quartz-bearing. ◼ Rhyolites contain a predominance of potassium feldspar. ◼ Dacites contain a predominance of plagioclase. ◼ Dacites can only be distinguished from rhyolites through microscopic examination
33 Granite rhyolite mqm mluuuuulluImmn
Granite Rhyolite
Extrusive(Fine-Grained) Igneous Rocks(2) Andesite: An igneous rock similar in appearance to a dacite but lacking quartz Named for the andes Basalt. Compositionally equivalent to coarse-grained gabbro, fine-grained basalt is the most common kind of extrusive igneous rock The dominant rock of the oceanic crust
Extrusive (Fine-Grained) Igneous Rocks (2) ◼ Andesite: ◼ An igneous rock similar in appearance to a dacite, but lacking quartz. ◼ Named for the Andes. ◼ Basalt: ◼ Compositionally equivalent to coarse-grained gabbro, fine-grained basalt is the most common kind of extrusive igneous rock. ◼ The dominant rock of the oceanic crust
Andesite mmmm nimrud FI 47B
Diorite Andesite Figure 4.7 B