Testing two great earth science hypotheses with paleomagnetism
About the Event:
Magnetic remanences trapped within rocks are perhaps Earth’s oldest remote sensing data, recording the direction and strength of the geomagnetic field over time. As early paleomagnetists started to tease out ancient magnetizations from the rock record, they realized that they could use them to directly test some of the most audacious and controversial hypotheses proposed in the history of Earth Science. During this lecture, we will briefly discuss why Earth has a magnetic field and how igneous and sedimentary rocks become magnetized. We will then test two famously controversial hypotheses: the theory of continental drift (as proposed in 1915), and the theory of global super-glaciations that heralded the rise of multicellular life on Earth (as proposed in 1964).
This lecture is an accessible introduction to basic concepts of paleomagnetism and is designed for 2nd year ASE undergraduates, but everyone is welcome to attend.
About the Speaker:
Dr. Kyle Bradley is a Research Fellow at the Earth Observatory of Singapore, where he works on understanding the active tectonics of Southeast Asia. He received a Ph.D. from the Massachusetts Institute of Technology, where he studied extensional tectonics of the Aegean region (including a lot of paleomagnetic work), and a B.S. in Geology from Caltech. He has taught undergraduate and graduate geological field mapping courses, and also teaches GIS and photogrammetry.