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Events in Physics
Title: Measuring The Earth's Ancient Magnetic Field    (Colloquia)
Start Date: 10/03/2005
Time: 4:30 pm
Location: 1 LeConte Hall
Speaker: Joshua Feinberg
Affiliation: Earth & Planetary Science, UC Berkeley
Contact Person: K. Lee   (510) 642-3034

The Earth's magnetic field varies its orientation and intensity through time. Geologists compile these magnetic fluctuations into a timeline useful for dating sedimentary strata and determining the kinetic motions of tectonic plates. Until recently, this timescale has covered only the last 300 million years, or 1/15th of the Earth's total history. A new magnetic mineral recorder has been recognized that will allow the geomagnetic timescale to be expanded into the earliest portions of Earth's history. A case study from the 2 billion year-old Bushveld Complex of South Africa will be presented.