1. Igneous Rocks Properties and Identification

2. Mt. Baker is a volcano made of igneous rocks
Igneous - formed by crystallization from molten magma.
Igneous rocks
Sedimentary –
I like this picture
Mt. Baker is a volcano made of igneous rocks

3. Rocks of the Vancouver Region
C & T p. 20

4. Igneous Rocks Intrusive (Plutonic) Rocks –
Formed by slow crystallization deep beneath the Earth’s surface.
Large visible crystals – phaneritic
Identified by mineral content.
Golden Ears, Maple Ridge.
Extrusive (Volcanic) Rocks - Formed by rapid crystallization on the Earth’s surface Crystals only visible under a microscope - aphanitic Identified by mineral content and structure
Mt. Garibaldi, Squamish.

5. Igneous Rocks Mineral Content

6. Plutonic Rocks - Structure of Granite
Polished granite section illustrating the mixture of large crystals of different minerals (q = quartz, af = albite feldspar, b = biotite mica

7. Plutonic Rocks Granite - quartz, orthoclase, hornblende
Granite - quartz, orthoclase, plagioclase, hornblende
Diorite - orthoclase (Na & Ca), hornblende
Gabbro - orthoclase (Ca), hornblende, pyroxene

8. Bowen’s Reaction Series
Correlation of Bowen’s Reaction Series with silicon content, viscosity of lava and relative resistance to chemical weathering

9. Volcanic Rocks - Lavas Rhyolite (high Si) Andesite Basalt (high Fe)
Basalt - vesicular

10. Sodium Feldspar Basalt (Porphyry) Calcium Feldspar basalt (Porphyry)
More Volcanic Rocks
Sodium Feldspar Basalt (Porphyry)
Calcium Feldspar basalt (Porphyry)
Obsidian
Volcanic Breccia

11. Volcanic Breccia - Kelowna

12. Successive eruptions – Coal seams in between!

13. Volcanic Rocks - Pyroclasts
Pumice
Scoria
Welded Tuff
Volcanic bomb - olivine core surrounded by basalt