GEOL 1 Lecture Notes - Lecture 10: Thermal Subsidence, Differential Stress, Geothermal Gradient
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Jeff Koo
Geol 1
Physical Geology
Spring 2019
4 Units
Sedimentary basins (find coal and oil here)
● Basins from where tectonic activity creates space
● Intracontinental basins: interiors far from margins result from differential thermal
subsidence
● May be linked to failed crustal rifts
Organic sedimentary rocks
● Coal
● Develops from peat in swamps
● Many grades of coal
● Lignite/ brown coal
● Bituminous
● Anthracite
Origin of oil and gas
● Formed from microscopic organisms
● Partially decomposed
● Buried
● Convert to oil/gas at higher temps
● Move upward into sandy layers
Southern California Borates
Sedimentary basins (find oil and oil here)
● Basins form where tectonic activity creates space
● Intracontinental basins- interiors far from margins
● Result from differential thermal subsidence
● May be linked to failed crustal rifts
Organic sedimentary rocks
● Coal
● Develops from peat in swamps
● Many grades of coal
● Lignite/brown coal
● Bituminous
● Anthracite
Origin of oil and gas
● Formed from microscopic organisms
● Partially decomposed