GEO 1111 Lecture Notes - Lecture 5: Love Wave, Lithosphere, Saurer

• School: University of Ottawa
• Department: Geology
• Course: GEO 1111
• Professor: Donald Cummings

Document Summary

Partial melting: partially melting the mantle (very mafic) creates mafic oceanic crust. As you melt it, you enrich is with more silica rich phases, giving granite (felsic) crust. Constructed based on fossil records and stratigraphy which were able to be correlated globally. The early part of the record is split up differently. Study of large scale sections of sedimentary strata. Allows us to interpret patterns in rock type (lithostratigraphy) and fossil (biostratigraphy) content. Dating in alabama and the rest of the midwest. Radioactive parent isotopes will decay over time (known decay curve and known half life) to create stable daughter isotopes. Uranium dating: most common: uranium 238, large half life. Once at the closure temperature diffusion of isotops wont be possible in or out of the crystal, which starts the minerals radiometric clock. It readily bonds with oxygen to form co2 and is recycled through the biosphere.