Explore the fascinating world of metamorphic rocks in this comprehensive 50-minute geology lecture. Delve into the textures and origins of metamorphic rocks, discover the minerals frequently formed within them, and examine the environments that produce these geological wonders. Learn about metamorphism, metamorphic grade, and the driving forces behind these transformations. Investigate various metamorphic textures, including foliation and porphyroblasts, and explore common metamorphic rocks, both foliated and nonfoliated. Gain insights into different metamorphic environments, such as contact metamorphism, burial metamorphism, and subduction zone metamorphism. Examine pressure-temperature timepaths, regional metamorphism, and the intriguing effects of impact metamorphism. Conclude with an understanding of index minerals and their significance in identifying metamorphic environments. This lecture, complete with closed captions, offers a comprehensive overview of metamorphic rocks for geology enthusiasts and students alike.
Overview
Syllabus
Intro
What Is Metamorphism?
Metamorphic Grade
What Drives Metamorphism?
Confining Pressure and Differential Stress
Metamorphic Rocks and Minerals
Metamorphic Textures Foliation describes any planar arrangement of mineral grains or structural features within a rock - Examples of folation
Solid State Flow
Excellent Slaty Cleavage
Porphyroblasts Other metamorphic textures
Common Metamorphic Rocks
Nonfoliated Metamorphic Rocks
Types of Metamorphic Environments TEMPERATURE INCREASES CENTIGRADE
Contact Metamorphism Aureole
Roof Pendants
Metasomatism • Hydrothermal metamorphism
Black Smokers
Geysers and Hot Springs
Rock Veins
Burial Metamorphism Associated with very thick sedimentary strata in a subsiding basin
Subduction Zone Metamorphism
Pressure-Temperature (P-T) Timepaths
Regional Metamorphism
Impact Metamorphism - Occurs when meteorites strike Earth's surface • Product of these impacts are fused fragmented rock plus glass-rich
Quartz polymorphs help identify impacts
Shocked Quartz
Chelyabinsk Meteor (2013)
Index Minerals - Changes in mineralogy scour from regions of low-grade metamorphism to regions of high-grade metamorphism - Index minerals are good indicators of metamorphic environments
Taught by
Earth and Space Sciences X
