EESA06H3 Lecture 9: Lecture 9.odt
Document Summary
Based on chapters 1 -4, 11, 19, 20. Supercontinent cycle to look at the past & predict the future. Tectonic future of planet earth: toward the next supercontinent. The beginnings of pangea ii: obduction of indian crust, and asia grows in size: obduction vs subduction, obduction = no under-thrusting/melting = no production of volcanoes = just colliding plates although some under-thrusting, areas of obduction: Important for oil & gas gas: professor augusto gannser, pioneer of himalayan geology, dressed up as a buddhist monk, discovered ophiolites in himilayas, book called geology of himilayas, realized existence of tethys ocean before india collided with asia. Subduction = recycles oceanic crust = melting = volcanoes (700 km deep: thicker oceanic plate subducted, volcanism produces island arcs which are recognized as continental crust, they cannot be subducted themselves. In the long term this is continental crust. Produces new crust and it"s fate over millions of years is.
