WORLD GEOLOGY

2/17/2020 1 Metamorphic Rocks Chapter 7 1.Heat & Pressure 2. Types of Metamorphism 3.Metamorphic Rocks 4. Metamorphic Minerals Protolith Metamorphic Rock (new texture, larger crystal size , new minerals) (Section 7.2) Solid State Reactions: High T High P H 2 O Metamorphic Rocks Metamorphic Changes 1. Minerals (mineralogy) 2. Crystal Size (texture) 3.

GEOL | 003 | WORLD GEOLOGY | lecture notes | 2/17/2020 1 Metamorphic Rocks 

2/17/2020 2 focus : origin of rupture epicenter : surface directly above the focus Body waves Vs. Surface waves 2/17/2020 3 • P waves are compressional (or longitudinal) – primary wave – Faster (approximately 3.5 miles/sec) – Can pass through solids and fluids • S waves are shearing (or transverse) – secondary wave – Slower (approximately 2 miles/sec) – Can

GEOL | 003 | WORLD GEOLOGY | lecture notes | 2/17/2020 2 focus : origin of 

2/17/2020 1 Ore Minerals Aka Economic Minerals… #33-45 Sulfur •S • Hardness = 1.5 - 2.5 • Stinks • Deposition from volcanic gasses Barite • BaSO 4 • Hardness = 3 - 3.5 • Very dense, white 2/17/2020 2 Bauxite • Hardness = 1 - 3 • Oolitic • Al(OH) 3 • Mined for Al Hematite • More hematite!!! Graphite • Hardness = 1 - 2, 1 perfect cleavage • Metallic luster • Common in Metamo

GEOL | 003 | WORLD GEOLOGY | lecture notes | 2/17/2020 1 Ore Minerals Aka E

2/17/2020 1 I g n e o u s R o c k s Chapter 4 We identify Igneous rocks by texture and composition Mafic : high ma gnesium and f err ic content (dark) Felsic : high fel dspar and si li c a content (light) 1. Composition: 2 types (Section 4.4) 2/17/2020 2 Intrusive : phaneritic Extrusive : aphanitic 2. Texture: 2 Main Types (very different from textbook) Additional Text

GEOL | 003 | WORLD GEOLOGY | lecture notes | 2/17/2020 1 I g n e o u s R o 

2/17/2020 1 4.6 Billion 3.9 Billion 2.5 Billion 541 Milli o Relative Dating Vs. Absolute Dating 1815 2/17/2020 2 Hadean 4.6 Billion to 4.0 Billion Absence of Rocks 2/17/2020 3 Archean: 4.0 Billion to 2.5 Billion Years (Scholle, 1983) 2/17/2020 4 First records of life: 1. 3.5 b.y. rocks in Australia 2. 3.4 b.y rocks in South Africa (Schopf et al. 2002) Photosyn

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