HR: 1340h
AN: GP43A-0922    [Abstracts]
TI: Geomagnetic paleosecular variation during the Creteacous Normal Superchron as recorded by new and published data from lavas
AU: Biggin, A J
EM: biggin@geo.uu.nl
AF: Utrecht University, Paleomagnetic Laboratory Fort Hoofddijk, Faculteit Geowetenschappen, Budapestlaan 17, Utrecht, 3584 CD, Netherlands
AU: Straathof, G B
EM: Gijs.Straathof@ed.ac.uk
AF: Utrecht University, Paleomagnetic Laboratory Fort Hoofddijk, Faculteit Geowetenschappen, Budapestlaan 17, Utrecht, 3584 CD, Netherlands
AU: * van Hinsbergen, D J
EM: hins@geo.uu.nl
AF: Utrecht University, Paleomagnetic Laboratory Fort Hoofddijk, Faculteit Geowetenschappen, Budapestlaan 17, Utrecht, 3584 CD, Netherlands
AU: Langereis, C G
EM: langer@geo.uu.nl
AF: Utrecht University, Paleomagnetic Laboratory Fort Hoofddijk, Faculteit Geowetenschappen, Budapestlaan 17, Utrecht, 3584 CD, Netherlands
AB: The secular variation of the ancient geomagnetic field can be quantified by measuring the angular dispersion of directions of magnetization recorded in sequences of lavas of roughly the same age. The latitudinal dependence of this dispersion can provide important information about the long-term symmetry and stability of the field. More than 16 years have passed since the last detailed examination of paleosecular variation of lavas (PSVL) prior to 5 Myr ago and a significant amount of reliable data has been made available since then. Here, we examine PSVL in the Cretaceous Normal Superchron using more than 100 new site mean data from Mongolia together with an updated database of published studies. We also compare this analysis with recent studies of PSVL for the last 5 Myr allowing us an insight into the relationship between patterns of PSV and reversal frequency and the role of mantle convection in forcing geodynamo behavior.
DE: 1522 Paleomagnetic secular variation
DE: 1560 Time variations: secular and longer
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2007 Fall Meeting