Geomagnetic stratigraphic dating

by Brendan Reilly | Dec 5, 2016 We are looking forward to AGU next week!We have a big group going this year, including three of our undergraduate researchers.Recently, magnetostratigraphy has acquired a broader meaning, now referring to many types of magnetic measurements within a stratigraphic sequence.Many of these measurements provide correlation and age control not only for the older and younger boundaries of a polarity interval, but also within intervals.We develop a statistical model for age uncertainties in stratigraphic cores that treats the true, but in practice unknown, ages of core samples as random variables.For inaccuracies in the ages of tie points, we draw the error from a zero-mean normal distribution.

Over the past century numerous methodologies have been developed to detect time variations of the geomagnetic field and environmentally significant magnetic properties in rocks. Time series analysis of individual or combined records is commonly employed to seek quasi-periodic components or characterize the timescales of relevant physical processes. Limitations on stratigraphic analyses due to incomplete age control and their relevance to sedimentary paleomagnetism. Records derived from diverse locations are often compared or combined to construct records that represent a global signal.Welcome to the new, Paleo-and-Environmental Magnetism Laboratory in the College of Oceanic and Atmospheric Sciences at Oregon State University.The P-Mag Lab is an NSF supported OSU facility dedicated to sediment magnetism and a resource for Pacific NW, national and international scientific communities.